How to assemble serial LCD kit

You can use this kit for displaying serial messages from Arduino. The kit is itself a programmable Arduino board that comes with ATmega328p. You just need to upload a serial LCD firmware to the ATmega328p chip of the kit and your kit is ready to display serial messages from Arduino. Read everything about the kit and serial LCD firmware from here.

Serial LCD KIT

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Theory behind Android- Arduino communication via Bluetooth

Bluetooth profile is a wireless communication interface that connects Bluetooth devices. The profiles define requirements for implementing of Bluetooth for various applications, such as, file transfer, wireless headset usage, etc.  The following figure depicts different Bluetooth profiles and their usage. (more…)

Troubleshooting electronic projects

We all know that troubleshooting is a process of identifying and solving problems that cause a circuit to malfunction. This article is about troubleshooting basic and amateur electronic projects, not about sophisticated devices . With the exception of minor problems,troubleshooting sophisticated systems at the circuit level, like computer, VCR, mobile phones, etc. requires special skills, knowledge and experience.

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Amarino DIY shield for Android-Arduino-Bluetooth experiments

We are now selling Amarino Nano 1.0 kit for Amarino experiments. It is fully assembled kit and includes Arduino Nano and Bluetooth module. You can easily test RGB LED and sensor graph features of Amarino toolkit app.

 Please check this page for more information. 

Amarino Nano-1-1


About Amarino Shield

Amarino shield in use (2)

Amarino shield can be used for doing several experiments with Amarino and Android serial emulators. For example, you can operate a multicolor lamp, sensor graph, light sensor, etc.

The shield is just a modification of previous shield designed and published by Sagar Sapkota (Buildcircuit.com). Amarino shield 3.0 has added one more header space for BlueSMiRF supporting altogether 3 different Bluetooth adapters.

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MicroSD card breakout board – buildcircuit.com

Most of the microcontrollers have  limited built-in storage. For example, Arduino UNO (Atmega328)has 1Kbytes of EEPROM storage and it might not be enough for all projects. If your project has any graphics, video, audio and data logging feature, you need a removal storage in it.

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4 in 1 DIY kit- dark sensor, latch circuit, astable multivibrator and clap switch

This is a simple 4-in-1 do-it-yourself (DIY) kit from BuildCircuit. The kit has four different circuits that can be switched on separately or together at a time using a DIP switch.

The four circuits are:

1. Dark sensor using LDR.

2. A latch circuit using NE555 timer.

3. Astable circuit using NE555 timer.

4. A clap-switch circuit using NE555 timer.

Besides these 4 circuits, by changing the values of the resistors and capacitors, you can change the behaviour of the circuits. (more…)

Simple ultrasonic range finder using HC-SR04

Description:The HC-SR04 ultrasonic sensor uses sonar signals to determine distance to an object. It offers excellent range accuracy and stable readings in an easy-to-use package. Its operation is not affected by sunlight or black material.However, acoustically soft materials like cloth can be difficult to detect.

Make Arduino on breadboard using FTDI breakout board

About FTDI FT232RL breakout board: This tutorial is about making Arduino on breadboard using a basic FTDI FT232RL based breakout board.The pinout of this breakout board matches the FTDI cable to work with official Arduino and cloned 5V Arduino boards. It can also be used for general serial applications. The major difference with this board is that it brings out the DTR pin as opposed to the RTS pin of the FTDI cable. The DTR pin allows an Arduino target to auto-reset when a new Sketch is downloaded. This is a really nice feature to have and allows a sketch to be downloaded without having to hit the reset button. This board will auto reset any Arduino board that has the reset pin brought out to a 6-pin connector. (more…)

How to make a batteryless (crystal set) radio

CRYSTAL SET

The simplest radio receiver, known as a Crystal Set, consists of nothing more than a coil, tuning capacitor, diode detector, and a pair of earphones. A typical circuit diagram for a Crystal Set Radio is given below where inductor or coil L1 is tuned by variable capacitor VC1 to the transmitter frequency. Diode D1 demodulates the signal, which is fed straight to the earphones. There is no amplification.

 

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Latch-up circuit using 555 and opto-coupler

Here’s a simple latch-up circuit using 555 timer and opto-coupler MCT2E. You can also use PC817 in place of MCT2E.  The NE555 timer is configured in astable mode.The components are selected in such a way that the frequency output of the astable circuit lies within the audio range. Opto-coupler, MCT2E is is used for latching the alarm.Under normal conditions, pin 4 of NE555 timer is set to ground via resistor R2(470Ohm) and its output at Pin 3 is held LOW. When switch S1 is pressed momentarily, transistor T1 (BC548) conducts to bring reset pin 4 to logic “HIGH” state, as a result, 555 timer activates and starts the sound and the LED inside the optocoupler glows and the phototransistor conducts. The transistor gets base bias via phototransistor and resistor R6(470R). The sound remains ON till you press the reset switch(S2).  When switch S2 is pressed, the base of the transistor connects to the ground(0V) and resets the 555 timer bringing Pin 4 to LOW state. This disables the alarm. (more…)

Motion sensor

Here’s a simple motion sensor. Sketch has been taken from Arduino site. The sensor’s output pin goes to HIGH if motion is present.  However, even if motion is present it goes to LOW from time to time, which might give the impression no motion is present. This program deals with this issue by ignoring LOW-phases shorter than a given time, assuming continuous motion is present during these phases. (more…)

Experiments with 741- Operational amplifier

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 accordingly.  A general calculation and working of similar project has been explained on buildcircuit.com.  CLICK HERE for the project. (more…)

RC module

Description: An RC circuit is used to introduce time delay in circuits. A combination of resistor and capacitor gives a time constant.

The following circuit shows a basic RC circuit. In the figure C1(100uF) works as a storage capacitor. When you press the switch, the capacitor charges quickly and provides base current to the transistor Q1, that results in collector current and that glows the LED D1.. The resistance R2(1K) provides a time constant of around 10seconds. After 10seconds, the base current is not enough for driving the transistor, so the LED also goes off. (more…)

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