LUX METER MODULE

LUX Meter project has been design to measure the illumination.  Illumination is luminous flux falling on surface area of photo diode.  This illumination converted to corresponding voltage using Op-Amp circuit.

SPECIFICATIONS

  • Supply 9 VDC PP3 Battery @ 20 mA
  •  Onboard Photo Diode
  •  Onboard preset for calibration
  •  Range selection via jumper 10mV/LUX, 1mV/LUX, 0.1mV/LUX
  •  Interfacing is via berg connector
  •  Power-On LED indicator
  •  Four mounting holes of 3.2 mm each
  •  PCB dimensions 53 mm x 38 mm

The project is designed around Texas instrument Op-Amp TLC271 which can operate from single supply with low bias current, here op-amp act as current to voltage converter.  5000 LUX (approx) can be measure with a voltmeter having 5V range.  Meter is not provided.

CALIBRATION

  • J1 Jumper : 10mV/Lux
  • J2 Jumper : 1mV/Lux
  • J3 Jumper : 0.1mV/LUX
  • PR2 Preset : To Calibrate the meter
  • PR1 Preset : Fine Gain adjustment for 10mV/Lux
  • CN1 Connector : Supply 9 VDC (PP3 9V DC Battery Ideal) and Output Voltage
  • D2 LED : Power Indicator
  • D1 LED : Photo Diode (Sensor)

Standard incandescent 100W lamp should be used for approximation calibration.  To make Calibration select the 1mV/Lux J2 Jumper, move the preset full in CCW.  Connect the accurate voltmeter having range of 5V. Adjust the distance between the photo diode and Lamp so that voltmeter reads 0.38V0.  At this point, illumination on photodiode surface is about 100 Lux (aprox).  And then adjust the PR2 so that voltmeter reads 1V.  Calibration has now been complete. This project is based on Hamamatsu Photo Diode Application

SCHEMATIC

LUX_METER_SCH

PARTS LIST

LUX_METER_BOM

 

PCB

DOWNLOADS

SOUND ACTIVATED SWITCH – RELAY

This project is a sound-activated switch.

DESCRIPTION

Clap switch/Sound-activated switch designed around op-amp, flip-flop, and popular 555 IC. Switch avoids false triggering by using a 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to an electrical wave which is further amplified by the op-amp.

555 timer IC acts as a mono-stable multi-vibrator then flip-flop changes the state of the output relay on every two-clap sound. This can be used to turn ON/OFF lights and fans. The circuit activates upon a two-clap sound and stays activated until another sound triggers the circuit.

Specifications:

  • Supply 12V DC @ 60mA
  • On board preset to set the sensitivity
  • On board LED to indicate the Relay on/off state
  • On board Microphone
  • Relay switch 5Amps, 110V-230V

SCHEMATIC

Sound_Activated_Switch_Top_schematic

PARTS LIST

image description

PCB

PIR SENSOR

This project is an automatic PIR sensor.

DESCRIPTION

Project is based on Holtek’s IC HT7610A, which is a CMOS LSI chip designed for use in automatic PIR lamp, flash or buzzer control. It can operate in 3-wire configuration for relay applications.  In our project we have used relay instead of Traic to connect any kind of load in output, HT7610B IC is suitable for traic and HT7610A for Relay application. The chip is equipped with operational amplifiers, a comparator, timer, a zero crossing detector, control circuit, a voltage regulator, a system oscillator, and an output timing oscillator.

Its PIR sensor detects infrared power variations induced by the motion of a human body and transforms it to a voltage variation. If the PIR output voltage variation conforms to the criteria (refer to the functional description), the lamp is turned on with an adjustable duration. The circuit doesn’t required step down transformer and can work directly by applying 110V AC or 220V AC (Capacitor C7 needs to change for 220V AC (0.33uF/275V) and 110V AC (0.68uF/275V)

FEATURES:

– Supply Input 110V or 220V AC ( Capacitor Value needs to Change)
– No Step Down transformer required
– IC Operating voltage: 5V~12V
– Load Current 80mA when relay is on.
– Standby current of the IC: 100uA
– On-chip regulator
– Adjustable output duration
– 40 second warm-up
– ON/AUTO/OFF selectable by MODE pin
– Override function
– Auto-reset if the ZC signal disappears over 3 seconds
– On Board Relay to connect output Buzzer or Flash
– On Board LDR to Detect Day/Night operation
– J1 to Set the Mode
– PR1 to set the Sensitivity of the sensor
– PR2 to set the output Turn On Duration
– CDS R11 for Auto Day/Night detection
– (HIGH Voltage On Board) Do Not touch the PCB while power is on.

SCHEMATIC

image description

Mode (Jumper J1):

This project offers three operating modes (ON, AUTO, OFF) which can be set through the MODE pin. While the chip is working in the AUTO mode the user can override it and switch to the TEST mode or manual ON mode, or return to the AUTO mode by switching the power switch. J1 Jumper is to set the desired modes.

J1 Jumper Operating Mode Description
VDD ON Output is always On: Output is high RELAY ON
VSS OFF Output is Always Off: Output is low RELAY OFF
Open Open Outputs remain in the off state until activated by a valid PIR input trigger signal. When working in the AUTO
mode, the chip allows override control by switching the ZC signal.

CDS-LDR (Light Dependent Resistor):

CDS is a CMOS Schmitt Trigger input structure. It is used to distinguish between day time and night time. When the input voltage of CDS is high the PIR input is enabled. On the other hand, when CDS is low the PIR input is disabled. The input disable to enable debounce time is 5 seconds. Connect this pin to VDD when this function is not used. The CDS input is ignored when the output is active.

LDR Operations

CDS PIN  (LDR) Status PIR
Low Day Time Disabled
High Night Time Enabled

LDR Operations

OSCD is an output timing oscillator input pin. It is connected to an external RC to obtain the desired output turn-on duration. Variable output turn-on durations can be achieved by adjusting variable resistor or setting various values of RC.

Power-on Initial

The PIR signal amplifier requires a warm up period after power-on. The input should be disabled during this period. In the AUTO mode within the first 10 seconds of power-on initialization, the circuit allows override control to enter the test mode. After 40 seconds of the initial time the chip allows override control between ON and AUTO. It will remain in the warm up period if the total initial time has not elapsed after returning to AUTO. In case that the ZC signal disappears for more than 3 seconds, the chip will restart the initialization operation. However, the restart initial time is always 40 seconds and cannot be extended by adding CRST to the RST pin as shown in the circuit.

The HT7610A offers mask options to select the output flash (3 times) when changing the operating mode. The output will flash 3 times at a 1Hz rate each time it changes from AUTO to another mode and flash 3 times at a 2Hz rate when it returns to the AUTO mode. However the output will not flash if the mode is changed by switching the MODE switch. Options for effective override: Once or twice Off/On operation of power switch within 3 seconds. Options for output flash to indicate effective override operation. Flash for the circuit.

Test mode control

Within 10 seconds after power-on, effective ZC switching will force the chip to enter the test mode. During the test mode, the outputs will be active for duration of 2 seconds each time a valid PIR trigger Signal is received. If a time interval exceeds 32 seconds without a valid trigger input, the chip will automatically enter the AUTO mode

Note:
– The output is activated if the trigger signal conforms to the following criteria:
– More than 3 triggers within 2 seconds
– A trigger signal sustain duration
– 0.34 seconds >/2 trigger signals within 2 seconds with one of the trigger signal sustain 0.16 seconds.
– The effective comparator output width is selected to be 24ms.
– The output duration is set by an external RC that is connected to the OSCD pin

Override control

When the chip is working in an AUTO mode (MODE=open), the output is activated by a valid PIR trigger signal and the output active duration is controlled by an OSCD oscillating period. The lamp can be switched always to ON from the AUTO mode by either switching the MODE pin to VDD or switching the ZC signal by an OFF/ON operation of the power switch (OFF/ON once or twice within 3 seconds by mask option). The term override refers to the change of operating mode by switching the power switch. The chip can be toggled from ON to AUTO by an override operation. If the chip is overridden to ON and there is no further override operation, it will automatically return to AUTO after an internal preset ON time duration has elapsed.

This override ON time duration is 8 hours. The chip provides a mask option to determine the output flash times (3 times) when changing the operating mode. It will flash 3 times at a 1Hz rate each time the chip changes from an AUTO mode to another mode or flash 3 times at a 2Hz rate when returning to the AUTO mode. But if the AUTO mode is changed by switching the MODE switch it will not flash.

PARTS LIST

BOM

PCB

AUDIO VU METER 9 LEDS

5 LED VU Meter kit is based on LB1409 IC from SANYO, which will indicates the volume level of the audio signal it senses

  • SUPPLY 12V DC @ 50mA
  • PR1 REF SET
  • PR2 AUDIO LEVEL SET

SCHEMATIC

schematicPARTS

parts

 

PCB

DOWNLOADS

4 CHANNEL INFRARED REMOTE RELAYS

4 Channel Infrared (IR) Remote controller is using  HT12A and HT12D encoder/decoder chips from Holtek.

FEATURES

  • Supply – Transmitter : 3 to 5 VDC, 5 V @ 20 mA & Receiver : 5 VDC @ 200 mA
  • Output: 4 channel Latch or Momentary onboard Jumper for selection
  • Crystal based oscillator for the reliability of operation
  • Jumper selectable 8-bit address code
  • LED output to indicate reception
  • On/Off slide switch in the transmitter
  • Power-On LED indicator in the Receiver / Transmitter
  • Valid transmission indicator
  • 4 LED for Relay On/Off status
  • Four mounting holes of 3.2 mm each
  • PCB dimensions – Transmitter : 43 mm x 56 mm & Receiver : 80 mm x 73 mm

SCHEMATIC

 

 

PARTS LIST

Receiver BOM

 

Transmitter BOM

VIDEO

PCB

TOGGLE ON / OFF SWITCH

This project describes how to build a “soft touch” switch. By “soft touch” we mean that you have to push once to set device ON and push again to set device OFF. This kind of switch works by latching a relay to ON state with push of a button and with another push latch is released. It is working like flip-flop states. In that way, you can control power to a device using one push button.

The circuit is build around a 555 timer configured in a way that let it latch on one state and an action is required to change state. The circuit is powered from +5V and there are connectors to connect controlling device. Inspiration from this project and circuit is found here: http://todbot.com/blog . We added a relay on output, an indicator led as well as connectors for power, an external push button and relay contacts.

SCHEMATIC

Schematic
The Schematic for this circuit can be seen above. The circuit toggles a relay when button S1 is pressed. Operation of this circuit is simple. Pins 6 and 2 of 555 timer are at half power voltage. When output pin 3 is high then capacitor C1 is charged and when it’s low capacitor is discharged. When button is pressed capacitor voltage appears on pin 6 and 2 and output pin 3 changes state as well as capacitor voltage changes. So when output is high capacitor has +5V. When we press the button pin 3 goes low and capacitor goes 0V, when we press button again output goes high again, so we have toggle functionality. When output is high transistor T1 is conducting current and relay is latched, when low relay is released. Diode D1 is used to protect transistor from back voltage generated when relay goes off.

A disadvantage of this circuit is that when we connect power to the circuit relay is engaged. A solution to this can be found on the second reference website below.

PHOTOS

Photo_2
Circuit is in OFF state
Photo_3
Push button is pressed and circuit goes to ON state. Relay switch on a high power LED

PCB

PCB of Toggle ON/OFF Switch

REFERENCES

PCB

8 CHANNEL RELAY BOARD

This project is a general-purpose 8 Channel Relay Board.

DESCRIPTION

8 Channel Relay Board is a simple and convenient way to interface 8 relays for switching application in your project. Input voltage level support TTL as well as CMOS. Easy interface with Microcontrollers based projects and analog circuits.

SPECIFICATIONS:

  • Input supply 12 VDC @ 336 mA
  • Output eight SPDT relay
  • Relay specification 5 A @ 230 VAC
  • Trigger level 2 ~ 15 VDC
  • Header connector for connecting power and trigger voltage
  • LED on each channel indicates relay status
  • Screw terminal connector for easy relay output and aux power connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 152 mm x 60 mm

SCHEMATIC

8_Channel_Relay_Schematic

PARTS LIST

8_Channel_Relay_Bom

PCB

ELECTRONIC TOGGLE SWITCH

The Project works as electronic toggle switch.

DESCRIPTION

The circuit is based on CMOS CD4013 Flip Flop IC, The circuit has two stable states, ON and OFF. Once it is ON, it remains ON till you press the switch again. A short button press of a tactile switch SW1 latches the circuit ON and another toggles it back OFF.

Relay switch contacts can handle high AC Voltage as well as High DC current, this makes the project suitable for application like ON/OFF Fan, Light, TV, Pump, DC Motor, any electronic project required electronic toggle operations and few other devices work on AC voltage up to 250V AC or DC current up to 5Amps.

Applications: TV, Audio Equipments, Radio, Fan, Pump, DC Motor, Electronic Projects ON/OFF

SPECIFICATIONS

  • Supply: 12V DC
  • Current: 60mA
  • D1: Power Indicator
  • D3: Toggle State ON or OFF indicators
  • CN1: Supply Input
  • SW1: Toggle Operation

SCHEMATIC

003_Schematic

PARTS

003_Bom_th

PCB

ONE CHANNEL RELAY DRIVER

This project is an one Channel Relay Driver suitable for a variety of projects.

DESCRIPTION

Single Channel Relay project  is a simple and convenient way to interface a relay for switching application in your project.

SPECIFICATIONS:

  • Input – 12 VDC @ 42 mA
  • Output – SPDT relay
  • Relay specification – 5 A @ 230 VAC
  • Trigger level – 2 ~ 15 VDC
  • Header pins for connecting power and trigger voltage
  • LED indicates relay status
  • Power Battery Terminal (PBT) for easy relay output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 27 mm x 69 mm

SCHEMATIC

ONCE_CHANNEL_RELAY_DRIVER_SCHEMATIC

PARTS LIST

ONCE_CHANNEL_RELAY_DRIVER_BOM

PCB

DC MOTOR DIRECTION CONTROLLER WITH TACT SWITCHES

DC Motor Direction Control project offers direction control using digital logic gates and a DPDT relay.

FEATURES

  • Supply input 12 VDC @ 75 mA
  • Power LED
  • DC Motor Direction LED Yellow/Green
  • Relay Output: up to 7 A
  • Onboard tactile switch for direction control
  • Relay based drive design with diode protection
  • LED indicator for direction indication
  • Power-On LED indicator
  • Terminal pins and screw terminal connector for easy input / output connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 41 mm x 81 mm

SCHEMATIC

DC_Motor_Direction_Controller_SCH

PARTS LIST

DC_Motor_Direction_Controller_BOM

PCB

DC SERVO MOTOR DRIVER

DC Servo Motor Driver kit, designed using MC33030 IC, is the fastest and low cost way of getting your DC Servo Motor up and running.

  • Input – 12 VDC
  • Output – can drive upto 1 A Load
  • Overcurrent shutdown, overvoltage shutdown
  • Programmable reference input
  • Power-On LED indicator
  • Relimate connector for interfacing the kit
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 45 mm x 54 mm

SCHEMATIC

schematic (1)

PARTS

parts

 

PCB

UNIPOLAR 4-PHASE STEPPER MOTOR CONTROLLER

This project is a 4-phase unipolar stepper motor controller.

DESCRIPTION

Unipolar 4-Phase Stepper Motor Controller Board will help you control a Stepper Motor or 4 individual Solenoids. This circuit consisting of transistors that serve as current amplifier and also diode to prevent damaging back EMF, circuit uses Darlington transistors to provide high current capacity to unipolar stepper motor. Just provide sequence of pulse using Micro-Controller or descript circuit to roll out the unipolar motor. On board High Watt resistor to control the current, value of the resistor can be set as per your load current requirement.

SPECIFICATIONS

  • Box Header (IDC) connector provides for easy interfacing option
  • Separate LED indicator for individual Phase
  • Screw terminal connector for easy connection of output load and power supply input
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 86 mm x 49 mm

SCHEMATIC

SCHEMATIC

 

PARTS LIST

BOM

PHOTO

C055

PCB

RC SERVO DRIVER 0-5V

0 – 5V Servo Controller project will control a hobby type servo motor connected to it via a preset or external DC source.  This kit will be ideal add on in animatronics and motion control application.

SPECIFICATIONS

  • Microcontroller based design for greater flexibility and ease of control
  • Single Servo control via clearly marked berg connector
  • Clearly marked jumper to select signal source to control the Servo
  • Onboard preset for ready to control option for this kit
  • Power-on LED indicator
  • Diode protection for reverse polarity connection of DC supply to the PCB
  • Four mounting holes 3.2 mm each
  • PCB dimensions 45 mm x 32 mm

This is a simple but a useful circuit to control a single servo motor.  Its an ideal add on to a RC Hobbyist tool kit. The DC input to this circuit should be 5 to 6 VDC.  DC signal is given to this board at connector marked CN1 (+V and GND).   You can also feed in a variable DC signal source at the other two pins on this connector to control the servo.  To use this signal source you need to place the Jumper link at J1 in the E position.  Alternatively, you can also control the servo motor by preset PR1 mounted on the PCB.  For this you need to place the Jumper link in the I position at J1.A Servo motor is connected at connector marked CN2 on the PCB.  This connector has all the pins clearly marked for connection to the servo.LED D1 is a power on indicator ,  Diode D2 provides a reverse polarity protection for the Microcontroller.

SCHEMATIC

Servo_Driver_SCH

PARTS LIST

Servo_Driver_BOM

PCB

L293D DC MOTOR DRIVER MODULE

The project designed around L293D IC. The L293D device is quadruple high-current half-H driver. The 293D is designed to provide bidirectional drive current up to 600mA a voltage from 5V to 36V. L293D Adapter Board can be used as dual DC motor driver or bipolar stepper motor driver.  Useful in robotics application, bidirectional DC motor controller and stepper motor driver.  Separate logic supply to reduce dissipation.  L293D includes the output clamping diodes for protections.

SPECIFICATIONS

  • Motor/Logic supply 5 to 36 V
  •  Logic controls input 7 VDC max
  •  Inhibit facility/enable
  •  High Noise immunity
  •  Over temperature protection
  •  Capable of delivering output current up to 600 mA per channel
  •  The control/interface lines are accessible with Berg connector
  •  Header connector for motor and supply connection
  •  PCB dimensions 36 mm x 24 mm

SCHEMATIC

L293D_DC_Motor_Driver_SCH

PARTS LIST

L293D_DC_Motor_Driver_BOM

PCB

DC MOTOR SPEED AND DIRECTION CONTROLLER USING L293D

DC Motor Speed and direction controller project based on L293D H-Bridge and 555 Timer IC. 555 Generate PWM and L293D works as output driver. The 293D provides bidirectional drive current up to 600mA a voltage from 5V to 12V. L293D includes the output clamping diodes for protections.

SPECIFICATIONS

  •  Supply 5 to 12 V
  • Inhibit facility/enable
  • PWM Frequency 5KHz Maximum
  • High Noise immunity
  • Over temperature protection
  • Capable of delivering output current up to 600 mA per channel
  • The control/interface lines are accessible with Berg connector
  • Header connector for motor and supply connection
  • PR1 : Preset Speed Adjust
  • SW1 : 3Pin Jumper and Closer for Direction change
  • CN1 : DC Motor Supply input 5V to 12V DC
  • Dimensions  48.26mm x 36.83mm

SCHEMATIC

DC_Motor_Speed_Controller_SCH

PARTS LIST

DC_Motor_Speed_Controller

PHOTOS

DC_Motor_Speed_Controller_M047A-500x500VIDEO

PCB

HALF BRIDGE DRIVER BASED ON IR2104

This Half-bridge driver based on IR2104 gate driver IC and N channel Dpak  MOSFET  , The IR2104 is a  high voltage, high speed power MOSFET driver with independent high and low side referenced output channels. HVIC and latch immune CMOS technologies enable ruggedized monolithic construction. The logic input is compatible with standard COMOS or LSTTL output, down to 3.3V logic. A gate IR2104 driver is a power amplifier that accepts a low-power input from a controller IC and produces a high-current drive input for the gate of a high-power transistor such as a power MOSFET. In essence, a gate driver consists of a level shifter in combination with an amplifier.

This drive has many application, ranging from  DC-DC power supply for high power density and efficiency, This project simplifies the design of control systems for a wide range of motor applications such as home appliances, industrial drives, DC brushed motors , Brushless motors, fans, Tesla Coil driver, Induction coil driver, LED driver, Halogen Lamp driver.

FEATURES

  • Load Supply 12 to 36V DC
  • Load Current 10Amps (Peak 20Amps)
  • Logic Supply 12 To 15V DC
  • Input Signals 3.3V to 15V
  • SMD based tiny design
  • Required Single PWM input
  • Shutdown Input
  • Screw Terminals for Load and Load Supply
  • Header Connector for Logic supply and inputs

SCHEMATIC

Half-Bridge-Driver-SCHEMATIC

PARTS LIST

Half-Bridge-Driver-BOM

CONNECTIONS

Half-Bridge-Driver-CONNECTIONS

PHOTO

Half-Bridge-Driver-IMG_4777

PCB

AC MOTOR SPEED CONTROLLER USING U2008B

This is a low cost, current feedback phase control AC motor driver based on U2008 IC. The U2008B is designed as a phase control circuit in bipolar technology. It enables load-current detection as well as mains-compensated phase control. Motor control with load-current feedback and overload protection are preferred applications.

SPECIFICATIONS

  • Supply Input:  230V AC
  • Load: up to 500W (Triac Requires Heat sink for Higher Load)
  • Jumper J1 Selection: A-Load Current Compensation or B-Soft Start
  • PR1: Preset for Phase Control ( Ramp Current Adjustment)
  • P1 : Potentiometer Set Point

SCHEMATIC

AC-Motor-Speed-Controller-SCH

PARTS LIST

AC-Motor-Speed-Controller-BOM

PCB

Scoreduino-B Arduino based controller for digital scoreboards

Watch the video of Scoreduino-B

SCOREDUINO-B works with SCORE4 module of Scoreduino app.

The SCOREDUINO-B’ module works as a basic controller for 2.3″, 3″, 4″, and 5″- 4 digits (2 on each side) scoreboards. It has 4 switches for up and down commands for each set of 2 displays.

Other features:

How does it work?

SCOREDUINO-B is designed to work with 2 sets of 2 digits up-down counter. This controller module fits into the female headers of the 2 digits counters on each side. It works with the SCORE4 app. Users can send specific numbers to each set of displays. The communication medium is either Bluetooth or RF or manual control.

An example:

When a user sends 15 to one of the displays, the Scoreduino-B sends up count pulses 15 times to count from 1 to 15, and finally, it stops at 15. All the up-down counters and scoreboards have been designed in that way.

These are the pins on the Scoreduino-B board:

On the left side:

  • 9V: This is to power up RED colored 2.3″ displays. We get this voltage from the voltage regulator LM78XX.
  • 5V: 5V is used for CD4511 and 74LS192 on the left side
  • GND: GND of Scoreduino-B connects with the GND of 2 digits up/down counter
  • A: Send pulse from Scoreduino-B via this pin in order to count UP
  • B: Send pulse from Scoreduino-B via this pin in order to count down
  • 14: Reset pin. Send pulse to reset the count.

On the right side:

  • V: V depends upon the color of the displays used on the right side. For example, GREEN colored 2.3″ display needs 12V. This is the default supply voltage.
  • 5V: 5V is used for CD4511 and 74LS192 on the right side
  • GND: GND of Scoreduino-B connects with the GND of 2 digits up/down counter
  • C: Send pulse from Scoreduino-B via this pin in order to count UP
  • D: Send pulse from Scoreduino-B via this pin in order to count down
  • 14: Reset pin. Send pulse to reset the count.

Components used:

  1. 1 x PCB
  2. 6 x 6 pin male header angle
  3. 1 x 6 pin male header for programming
  4. 1 x 9 pin female header- to be changed in the next version to make it 4CH only.
  5. 5 x tactile switches
  6. 2 x heat sink set
  7. 1 x LM7805
  8. 1 x LM7809
  9. 2 x 22pF capacitor
  10. 1 x 16Mhz oscillator
  11. 3 x 10uF
  12. 2 x PC817
  13. 5 x 10K
  14. 5 x 1K
  15. 3 x 5mm LED (RED Green and BLUE)
  16. 1 x 1P DIP switch
  17. 1 x buzzer
  18. 1 x DC barrel
  19. 1 x resettable fuse
  20. 1 x Bluetooth module
  21. 1 x 16 pin DIL socket
  22. 1 x 28 pin DIL socket
  23. 1 x Atmega328P
  24. 1 x CD4049

See all the images on Flickr

The Schematic:

This is how we use Scoreduino-B:

  1. 2.3 inch scoreboard.      Watch it on youtube
  2. 3 inch scoreboard.         Watch it on youtube
  3. 4 inch scoreboard.         Watch it on youtube
  4. 5 inch scoreboard

It works with SCORE4 module of Scoreduino app.

See all the images on Flickr

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Single digit common anode up and down counters/drivers for seven segments displays

Main points:

  • Seven segment displays are available in different sizes. We have designed six different drivers for COMMON ANODE seven-segment displays. The drivers are available for 1.2″, 1.8″, 2.3″, 3″, 4″, and 5″ seven-segment displays.
  • The single-digit drivers work with SCORE1, SCORE2, and SCORE3 modules of Scoreduino app.
  • The module can be triggered with NE555, flashing LED, basic trigger module, Scoreduino-A, and Arduino. It can also be triggered by anything that generates a clock pulse. If you use the ‘Scoreduino-A’ board, you can either control it using the RF remote control, by pressing UP and DOWN switches or using Scoreduino app (send commands via Bluetooth)
  • You can simply place the display on the driver board and solder it. In just a few minutes, the display will be ready to count up and down.
  • We also have one driver for 2.3″ common cathode display. The common cathode driver is not a part of the Scoreduino project, it is a part of the objects counter project.
  • Each driver has headers on two sides to receive up/down count signals and to concatenate with another driver module.
  • You can connect unlimited number of driver boards. 

This image shows 2.3″ common anode 7- segment displays drivers. There are similar drivers for 1.2″, 1.5″, 3″, 4″ and 5″ displays and all the single digit drivers can be controlled with basic trigger module and Scoreduino-A module (this comes with Bluetooth module and RF remote control)

Applications:

Why did we make it?

This is just a by-product of a digital Scoreboard or Scoreduino project. We were designing a table tennis scoreboard andwe noticed that there are no 2.3″ seven segment display drivers available. So, we derived the idea of a single-digit driver from the scoreboard.

What makes it special?

  • The size of the seven-segment display makes it special. The display is large enough to be seen from 100 meters.
  • You can concatenate as many displays as you want.
  • It can be used with NE555, Arduino, flasher LED, Scoreduino-A, basic trigger module, or anything that can generate a count pulse.
  • There is no extra complicated wiring or programming to make it work. Just get your common anode seven segment display and solder it on the driver board and power it up, it just starts counting.
  • You can at least use it to test your own displays. When you buy a seven-segment display from any store, the first struggle most people face is to find a reliable circuit to test it. This driver does the hard work. We have included the schematic also, so, you can get some ideas on driving the displays.

Can the driver increase or decrease a count for any specific sensor value? Yes, it does.

Schematic:

This is the schematic for all the single-digit drivers. Just the resistors are different. The value of resistor depend upon the color and size of the seven-segment displays.

 

Pinouts on one side:

  • 9V: The module works strictly with a 9V power supply.
  • 5V: Connect the 5V of Arduino
  • GND: Connect GND pin of Arduino
  • 5: Send pulse from Arduino via this pin in order to count UP
  • 4: Send pulse from Arduino via this pin in order to count DOWN
  • 14: Reset pin. Give pulse to reset the count

Pinouts on the other side:

  • 12: This connects to pin 5 of another module
  • 13: This connects to pin 4 of another module
  • 14: Pin 14 on both sides are connected

The following video shows an example with 2.3″ common anode driver:

Limitations:

This is basically an UP and DOWN counter module. It either counts up or down, that’s it. Though it can be used with Arduino, please be mindful of its limitation, it is not like any other drivers which display any specific number. However, there are some possibilities also. Suppose, to display a number, let’s say, 95, you need to send count pulse for 95 times to the module and it takes less than 1 second to count from 00 to 95. You won’t even notice that the Arduino counted 95 times.

However, if you want to display, for example, 886, it will take around 5 seconds to count from 000 to 886. Therefore, the module may become impractical for more than 3 displays.

Why is this limitation? Why was the driver designed this way?

You cannot make a temperature display board using this module. It is just a counter that counts up or down.

The drivers were designed in this way because we first wanted to design scoreboards only and the up and down counter concept would be sufficient to build a scoreboard. Later, when we succeeded in making the scoreboards, we wanted to release single-digit drivers and 3 digits up and down counters as a by-product of the Scoreduino project. Besides, we wanted to make very simple up and down counters that could be used by anyone who does not know anything about Arduino or programming. To support this, we have added RF remote control also so that it could be operated by anyone.

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