8 DIGIT NUMERICAL 7 SEGMENT SPI DISPLAY SHIELD FOR ARDUINO UNO

8 Digit serial numerical display shield for Arduino has been designed for various applications like digital clock, stop watch, score display, temperature meter, frequency counter, digital meters etc. The circuit uses popular MAX7219 IC and two common cathode 0.5inch red seven segment displays. The MAX7219 is a compact, serial input/output common-cathode display drivers that interface Arduino UNO to 7-segment numeric LED displays of up to 8 digits. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8×8 static RAM that stores each digit. Only one external resistor R1 provided to set the segment current for all LEDs.  A convenient 3-wire serial interface connects to all Arduino UNO. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219 also allows the user to select code-B decoding or no-decode for each digit. The devices include a 150µA low-power shutdown mode, analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on. The project works with 5V DC and SPI interface connected to Arduino Digital pins D4, D5 and D6.

KEY FEATURES

  • SUPPLY 5V DC
  • Additional CN1 provided for external micro-controller
  • Switches S1, S2, S3 for development, connected to Arduino Pin Analog A3, A4, A5
  • CN2 for analog input to Arduino Analog pin  A0
  • SPI Serial Pin connected to D4, D5, and D6 of Arduino UNO
  • Additional SPI Connector provided to use the board with other micro-controller board
  • 10MHz Serial Interface
  • Individual LED Segment Control
  • Decode/No-Decode Digit Selection
  • 150µA Low-Power Shutdown (Data Retained)
  • Digital and Analog Brightness Control
  • Display Blanked on Power-Up
  • 8 Digit Common-Cathode LED Display

SCHEMATIC

DISPLAY DIAGRAM

PARTS LIST

PHOTOS

 

PCB

4 CHANNEL RELAY SHIELD FOR ARDUINO UNO

4 Channel Relay Shield for Arduino UNO is a simple and convenient way to interface 4 relays for switching applications in your project. Very compact design that can fit on top of Arduino UNO. Project requires 12V DC supply, all 4 trigger inputs require TTL signal, Relay-1 to Relay-4 inputs connected to D8 To D11 of Arduino digital pins through solder jumpers J1 To J4. All trigger inputs can be connected to other I/O pins of Arduino using female header connectors and you will need to open solder jumpers J1-J4 in this case.  D1, D2, D3, D4 LEDs provided to indicate the Relay ON/OFF status. D5 is Power LED. Each relay has 3 pin screw terminals with normally open/normally closed switch to connect the load. Project is ideally used for low voltage applications and requires extra care in case of using high voltage AC switching.

FEATURES

  • Input supply 12 VDC @ 170 mA ( Arduino DC Jack)
  • Output four SPDT relay
  • Relay specification 7A/24V DC-230V AC
  • Trigger level 2 ~ 5 VDC
  • Header Connector for connecting power and trigger voltage
  • Solder Jumpers J1, J2, J3, J4 Interface Arduino Pins D8, D9, D10, D11
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for easy relay output
  • PCB Dimensions 68.37MM x 51.91 MM

SCHEMATIC

PARTS LIST

PHOTOS

PCB

2 CHANNEL HIGH CURRENT ARDUINO RELAY SHIELD

2 Channel Relay Shield for Arduino UNO is a simple and convenient way to interface 2 relays for switching applications in your project. The board has been designed using large current relay that can handle a load up to 30Amps. Relay circuit is optically isolated to prevent any kind of EMI noise. The board directly seats on Arduino Uno. Project requires 12V DC supply, Relay-1 can be controlled using digital pin D12 of Arduino and Relay-2 interfaced to digital pin D2 of Arduino, J1 and J2 solder jumpers provided in case of Arduino and Relay board to be power up from same supply line. LED D2 and LED D4 indicate the Relay ON/OFF operations. Open the jumpers J1 and J2 in case of complete isolation required.

Specifications

  • Input: 12 VDC @ 160mA
  • Output: Two SPDT relay
  • Relay specification: 30 A /230V
  • Screw Terminal to supply Arduino
  • CN3 Power Input to Relay Board
  • Trigger voltage input TTL level
  • Digital Pin D12 Connected to Relay 1 and D2 to Relay 2
  • Header connector for connecting power and trigger voltage
  • LED on each channel indicates relay status
  • Power Battery Terminal (PBT) for easy relay output connection
  • PCB Dimensions 68.37mm X 51.01 mm

SCHEMATIC

PARTS LIST

PHOTOS

PCB

3.6A BIDIRECTIONAL DC MOTOR DRIVER SHIELD FOR ARDUINO NANO

This is another Arduino Nano shield which can drive a Brushed DC Motor in both directions with PWM signal for speed control and it also includes current trip feature. Project is based on DRV8870 IC which can handle current up to 3.6Amps, The shield also includes an IR sensor and trimmer potentiometer. Trimmer Pot helps to develop speed motor control application, IR sensor can be used to make remote based DC motor driver. DRV8870 requires two PWM signals to control the motor speed and direction and both these pins are connected to D9 and D10 PWM pins of Arduino Nano.  Analog pin A0 connected to Trimmer Pot, digital pin D12 connected to IR sensor, two IN1 and IN2 PWM pins are connected to Digital PWM pin D9 and D10 of Arduino Nano. The board can drive brushed DC Motor up to 3.6Amp and voltage 6.5V to 12V DC.  This shield can drive higher voltage DC motor up to 45V with few changes. Remove R3 and D1 and use higher value and voltage rating capacitor C1 on motor supply. Trimmer potentiometer PR1 is used to adjust the maximum load trip current. For more information refer DRV8870 datasheet.

A single-power input, VM Motor supply, serves as both device power and motor winding bias voltage. The integrated charge pump of the device boosts VM internally and fully enhances the high-side FETs. Motor speed can be controlled with pulse-width modulation, at frequencies between 0 to 100 kHz. The device has an integrated sleep mode that is enabled by bringing both inputs low. An assortment of protection features prevent the device from being damaged if a system fault occurs.

DRV8870 DESCRIPTION

The DRV8870 device is a brushed-DC motor driver for printers, appliances, industrial equipment, and other small machines. Two logic inputs control the H-bridge driver, which consists of four N-channel MOSFETs that can control motors directionally with up to 3.6-A peak current. The inputs can be pulse-width modulated (PWM) to control motor speed, using a choice of current-decay modes. Setting both inputs low enters a low-power sleep mode. The DRV8870 device features integrated current regulation, based on the analog input VREF and the voltage on the ISEN pin, which is proportional to motor current through an external sense resistor. The ability to limit current to a known level can significantly reduce the system power requirements and bulk capacitance needed to maintain stable voltage, especially for motor startup and stall conditions.

FEATURES

  • Supply 6.5V to 12V DC
  • Motor Load Up to 3.6Amps
  • Over Load Current Facility
  • Over Load Trip Adjust Trimmer Pot
  • Trimmer Pot provided on Analog Pin A0 to make Motor Speed Controller
  • IR Sensor On D12 Digital Pin
  • PWM Frequency 0-100Khz
  • Motor Input Pin In1 and In2 Connected to D9 and D10 PWM Pins
  • PCB Dimensions 59.19mm X 38.15mm

SCHEMATIC

PARTS LIST

CONNECTIONS

FUNCTION DIAGRAM

H-BRIDGE STATES

PHOTOS

PCB

8 CHANNEL OPTICALLY ISOLATED I/O SHIELD FOR ARDUINO NANO

This shield enables you to interface many different devices to Arduino Nano using optically isolated inputs/outputs. The circuit consists of 4 Input channels and 4 Output channels and all 8 I/O lines are optically isolated. This project can help in various industrial applications where EMI noise and high voltage lines can damage the Arduino Nano or other circuits connected to it.  Circuit is built using 8 x 6N137 optocoupler. The 6N137 optocoupler can switch at frequency up to 10 MHz.

Features

  • Supply of Arduino Nano 7-12V DC
  • Supply to Outputs of Optocoupler 5V DC
  • All Outputs are TTL 5V
  • Inputs 3.3V to 5V DC
  • 4 Channel Inputs
  • 4 Channel Outputs
  • PCB Dimensions 61.09 mm X 48.89 mm

SCHEMATIC

PARTS LIST

CONNECTIONS

PHOTOS

PCB

8 RGB LED DRIVER SHIELD FOR ARDUINO NANO WITH OPTICAL DEFUSE SENSOR

The board consists of 8 x RGB LEDs 1W, BJT transistors on each LED, series resistor across the LED for current limiting, a hole to mount 18mm optical sensor which may be a defuse sensor for object detection with Arduino nano.  The board can be programed to create multiple RGB LED related applications, like interactive lamp, automatic bathroom light etc. I have used Omron E3F-D32 defuse optical sensor which can detect human or object at a distance up to 300mm. When the sensor detect any object within the range of 300mm its toggles output. The output is PNP type, the range of sensor is adjustable using trimmer pot and also sensor has LED operation indicator. All RGB LED transistors connected to D3, D5, D6 of Arduino PWM pins which helps to create multi-color effects. Optical sensor connected to digital pin D13 of Arduino Nano. Board also has prototype area to mount other sensors or circuitry and some additional components are provided to make PIC based applications or RS485 based RGB LED controller. Circuit works with 12V DC input.

FEATURES

  • Supply 12V DC
  • 8 RGB LEDs Each 1W
  • Defuse Reflective Sensor for Interactive Light
  • PCB Diameter 92.06 MM

SCHEMATIC

PARTS LIST

CONNECTIONS

PHOTOS

VIDEO

PCB

10 X 1W WHITE LED SHIELD FOR ARDUINO UNO

This project includes 10 LEDs of 1W each, and provides high intensity lighting that can be used in various applications. The board is made in Arduino shield form and can be used with Arduino Uno or Mega. Each LED can be controlled individually connected to digital pins D2-D11 of Arduino. Circuit requires 9-12V supply, it can work with lower supply by changing current resistor across LEDs. Applications include: Large size Bar-graph monitor, led sequencer, strobe, LED light effects are possible applications with this board. CN3 provided to interface PYRO sensor or any sensor to create interactive light effects.

FEATURES

  • Supply 9-12V DC
  • Maximum Load on each channel 200mA (Total 2Amps)
  • LED 1-10 Connected to D2,D3,D4,D5,D6,D7,D8,D9,D10,D11 of Arduino
  • CN2 Power Input
  • CN3 Sensor Interface
  • PCB dimensions: 87,79 x 51.17mm

SCHEMATIC

PARTS LIST

PHOTOS

VIDEO

PCB

VOICE CHANGER

B011-500x500-500x500Voice Changer project can be used to transpose or distort one’s voice by encoding the sound appearing at the Microphone input.  This project  is built around AP8072 IC.

SPECIFICATIONS

  • Supply input : 6 VDC @ 200 mA
  • Output : Speaker, 8 Ω / 0.5 W
  • Audio amplifier type LM386 with volume control preset
  • Jumper selectable tone frequency for encoding sound
  • 4 Tones to choose
  • Built in noise reduction circuit for reducing environment noise
  • On/Off Jumper connector for power supply input
  • Berg connector for power supply input and speaker output
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 48 mm x 52 mm

SCHEMATIC

sch

PARTS LIST

bom

JUMPER SETTINGS

jumper

PCB

DOWNLOADS

LIGHT TO AUDIO OSCILLATOR

Light Sensitive Audio Oscillator project is a fun-loving project which will create different sound effects depending on the light falling on the sensor

SPECIFICATIONS

  • Supply input 5 ~ 12 VDC
  • Output 8 Ohms, 0.5 W Speaker
  • Terminal pins for supply voltage and speaker connection
  • Power-On LED indicator
  • PCB dimensions 38 mm x 44 mm

SCHEMATIC

sch

PARTS LIST

bom

PCB

LM386 SMD AUDIO AMPLIFIER MODULE

The Tiny Audio Amplifier MODULE  is a good choice for battery operation. It is based on  LM386 IC, useful in various applications like robotics, science projects, intercom, FM radio and many more.

LM386_Amplifier_IMG

SPECIFICATIONS

  • Power Supply 6V-9V
  • 300mW Output @ 8Ohms Load
  • On Board Potentiometer for Audio Level Adjust
  • Header Connecter for Supply, Signal in and Speaker
  • On Board Power LED
  • Input: Standard Audio Signal

SCHEMATIC

LM386_Amplifier_SCHEMATIC

PARTS LIST

LM386_Amplifier_BOM

VIDEO


PCB

BuildCircuit is selling similar audio amplifiers for electronics beginners, hobbyists and students

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2 x LM386 Audio Amplifier Module

US $7.50
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BCLM386
Categories:

LM386 Audio amplifier DIY Kit

US $5.50
BC-818

PAM8302- Mono 2.5W Class D Audio Amplifier

US $4.95
This amplifier module is similar to LM386 module.

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