In this article, you will know about three easy, useful and absolutely FREE Android applications that facilitate serial communication between Arduino and Android via Bluetooth medium. Before moving on to applications, you can check this article to know about the fundamentals of Android-Arduino communication using Bluetooth. Now, let’s start with the applications first, then we…
The Tiny Mic Preamplifier based is based on a single transistor amplifier design. It amplifies the output of the electret condenser microphone. Good choice for Karaoke. SPECIFICATIONS Power supply: 5 ~ 9 VDC @ 2 mA Provides standard audio signal PCB dimensions 26 mm x 56 mm SCHEMATIC PARTS LIST PCB DOWNLOADS mic_preamplifier.pdf
Link to this gist: https://gist.github.com/buildcircuit/3939423
This is a basic electronic DIY kit for beginners. The kit generates a light explosion effect with several LEDs. The scrolling of the LEDs is controlled by CD4017 and NE555. You can adjust the speed of the explosion using a potentiometer. You need basic soldering skill to build the kit. It takes about an hour…
Description: This versatile 741 operational amplifier module can be used for making a dark detector using an LDR, a photo transistor and a photo diode. The amplifier has been configured in inverting mode. It compares the change in voltage at pin 2 with the reference voltage at pin 3 and gives output at pin 6…
Before you read this post, please read the following posts: a. Introduction to Amarino evaluation shield. b. Amarino evaluation shield assembly tutorial. You can do several experiments with Amarino evaluation shield, for example, control RGB LED, visualize sensor graph on Android phone, display SMS on LCD, etc. Before we start the experiments, let’s check the…
A 3 pin NTC thermistor and LM393 comparator based module can be used to sense temperature or heat. It can be used both with and without Arduino. First, let’s see how you can use it with Arduino. Experiment: In this experiment, we simply increase the ambient heat around the thermistor and we’ll see how the…
Description: This versatile dark sensor is made up of two transistors. It is a versatile module, because you can use it for testing several electronic components, such as, relay, reed switch, light dependent resistor(LDR), electret microphone, phototransistor, photodiode, etc. Besides, you can use this module for making simple clap switch, light operated switch, water level…
Here’s a very simple program to display some characters/strings on 16×2 LCD using Nokia N900 terminal and arduino.
The ADXL203 Module  is high precision, low power, complete dual-axis accelerometers with signal conditioned voltage outputs, all on a single, monolithic IC. The ADXL203 measure acceleration with a full-scale range of ±1.7 g, ±5 g, or ±18 g. The ADXL203 can measure both dynamic acceleration (for example, vibration) and static acceleration (for example, gravity).The typical…
This project is an automatic PIR sensor. DESCRIPTION Project is based on HoltekÂ’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. Â In our project we have used relay instead of Traic to connect any kind…
Description: In the monostable mode, the 555 works as a “one-shot” pulse generator.  Other applications of monostable mode include timers, pulse-width modulation (PWM), missing pulse detection,  touch switches, frequency divider, capacitance measurement, bouncefree switches  and so on.Â
VT-100 terminal emulator is a program for communicating with any serial device using a Bluetooth serial adapter. The RFCOMM/SPP protocol emulates serial communications over Bluetooth. You need a Bluetooth serial adapter.
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…
In this tutorial, we will turn on and off the LEDs sequentially, such as Christmas tree lights.
555 timer configured in monostable mode is a simple automatic dark sensor circuit that gives output when light falling on LDR is blocked.
Contact-less controlled automatic wardrobe light turns on the LED when you open the wardrobe door. Τhe project is based on Hall effect IC including LED driver and tiny magnet. Board doesn’t require any mechanical switch. When magnet is close to the board, LED is off, when you open the wardrobe door magnet goes far from…
