RF Transmitter and Receiver

Making our projects Wireless always makes it to look cool and also extends the range in which it can be controlled. Starting from using a normal IR LED for short distance wireless control till an ESP8266 for worldwide HTTP control there are lots of ways to control something wirelessly. In this project we will learn how we can build wireless projects using a 433 MHz RF module. These modules are cheap for its functions and are easily available.


Here we will learn the basics of RF module and how to use it as a standalone RF Transmitter and Receiver. Here we have explained the RF Transmitter and Receiver Circuit by controlling the LEDs wirelessly using RF.

DIY Cheap MP3 Player

In this tutorial we will learn how to build a simple yet powerful MP3 player that could play any MP3 song, the volume and track can also be adjusted with the help of push buttons. With some extra effort you can build your own pocket MP3 Music player and take it with you on the go.

Here is the breadboard setup of this mp3 player circuit



Below are the list of required components to build this music player:

• GPD2846 MP3 player Module 
• 3 Push Buttons 
• 3.3V Voltage regulator 
• On/off button 
• Speaker 
• Breadboard 
• Connecting wires 
• 220K resistor 
• Soldering kit

Below video demonstrates the working of this mp3 player.

DIY Power Bank

You can make your own power bank with the help of a li-ion battery, TP4056 Module and a boost converter. This portable power bank can charger your cell phone with USB cable. Here is the demonstration pic:



You can see the components in demo pic and charging the phone by using it.

Check out the link for the complete DIY instructions to build this power bank, along with a circuit diagram and connections: DIY Power Bank

Biometric Attendance System using Arduino

There are many kinds of attendance systems are popular such RFID based attendance systems. With latest technologies there are many kind of sensors which can effectively identify a person based on their biometric featues, such as fingerprints or retina. In this project we have built a fingerprint sensor based attendance system which will make the attendance  based on the matching of fingerprints.



As shown in the above breadboard setup it uses a fingerprint sensor, LCD, buzzer, input buttons which are useful to give input and display output. To get the circuit connections for this project and complete arduino code, visit the link below which will redirect to the project page on circuitdigest.com

Fingerprint based Attendance System