Obstacle sensor using Arduino and HCSR04

arduino-sensor-ultrasonico-hc-sro4-01

BuildCircuit has previously published a project on HCSR04 ultrasonic range finder module. You can checkout the article from this link.

Now, we have another article on HCSR04. It is as simple as the previous project.

HCSR04 ultrasonic range finder module: The HC-SRO4 is an ultrasonic sensor which uses sonar to detect objects at a distance of 2 cm to 4 meters.  This sensor is widely used in robotics to build robots that move and should divert or avoid obstacles. You can read more about this module on this article(more…)

Yet another simple amplifier for your Arduino and music projects

BuildCircuit has written few articles about audio amplifier and music modules. One of the most popular examples is “Audio amplifier using LM386“. This article is about a bit advanced audio amplifier made using TDA7052A.

Download datasheet of TDA7052A

It is not wise to connect an 8 Ohm loudspeaker directly to Arduino microcontroller pins. When we calculate the current through the speaker we get : I=V/R= 5V/8 ohm=0.625A=625 mA. But microcontroller pin can only drive 20 mA to 40 mA. So, this project can solve this problem. This amplifier can be used with music modules like WTV020SD.

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SNAKE 8X8 LED MATRIX

I have taken this project from fritzing.org. This project has been released under creative commons license. This project can be useful Arduino beginners for learning 8X8 LED MATRIX. The experiment publisher has made a simple snake game. I have not tested this project, but I am sure that it should work on your breadboard also. (more…)

Powering up 3 digit object counter with USB cable

Step 1: In any USB cable(for example, the one you use for charging your phone), there are 4 wires.

using usb cable for object counter (1)

Step 2: Use your multimeter to find out which two wires give +5V. One wire should be +5V and the other should be -VE (GND).

using usb cable for object counter (3)

Step 3: Connect the +5V wire to +ve point of screw terminal and -ve to – (minus) point of screw terminal.

using usb cable for object counter (5)

The object counter can now be used. Likewise, you can power up the infrared transmitter also.

using usb cable for object counter (6)

If you are using more than one transmitter and receiver, you can use this type of USB splitter. You can USB splitters with many ports also. 

BC-3014A

3 Digit Digital Objects Counter With Laser Module

$22.88$30.53
This is 3 digits digital object counter kit

Check out all the counters

COU-18

1.8" Photoresistor And Laser Operated Medium Digital Objects Counter

$38.18
This is an upgraded version of the previous
COU-902

2.3" common cathode seven segment display driver

$22.88$30.53
This is a CD4026 based up counter driver

CD4026- 1 Digit Up Counter Module

$7.57
  • It works as an UP counter. You can
Sold out
COU-23

Photoresistor And Laser Operated Large Digital Objects Counter With 2.3" Displays

$45.83
A laser light module illuminates the photoresistor continuously

Remote operated switch DIY kit

Description: Here’s a simple do-it-yourself (DIY) remote operated switch. You can use this simple kit to switch ON/OFF any appliances working on 220V AC. This DIY kit has been designed basically as a learning kit rather than as a household device. With this kit, you may learn about relay and infrared sensor. It can used for fun at home for switching appliances operating on 220V AC. (more…)

NeuroDreamer Sleep Mask

Use your brainwaves to help you rest, guided by soothing music and fading lights.” – The NeuroDreamer Sleep Mask by Cornfield Electronics is a meditation device that flashes colored lights at your eyelids and plays brainwave beats for your ears to help you fall asleep, have lucid dreams, or for meditation. NeuroDreamer is open source and CC-licensed and also designed by Adafruit friend Mitch Altman.

The NeuroDreamer is open source, so it can be fun to explore the schematic diagram while looking at the physical device. The main board has a Zilog Z8F083A 8 bit microcontroller, similar to but less expensive than an Arduino chip, important for reducing cost of bill of materials for manufacturing many thousands of units. (more…)

Arduino YÚN

Source: arduino.cc

Arduino YÚN is the first member of a new groundbreaking line of wifi products combining the power Linux with ease of use of Arduino. The first Arduino YÚN is the combination of a classic Arduino Leonardo (based on the Atmega32U4 processor) with a Wifi system-on-a-chip running Linino (a MIPS GNU/Linux based on OpenWRT).

It has embedded the Linux machine directly on the PCB of the Arduino Leonardo and has connected the two so that from Arduino it’s very easy to run commands on the Linux side and use it as an Ethernet and Wifi interface.

Historically, interfacing Arduino with complex web services has been quite a challenge due to the limited memory available. Web services tend to use verbose text based formats like XML that require quite a lot or ram to parse. On the Arduino YÚN a Bridge library has been created which delegates all network connections and processing of HTTP transactions to the Linux machine.

ArduinoYUNFront_450px

Image source: arduino.cc

(more…)

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