Category Archives: Robot Circuits



Ultrasonic Distance Detector / Sonar Ranging System

This is the ultrasonic distance detector or sonar ranging system which can be used for general purpose. There are kit version available on the market, but of course the price is 3x more expensive than if you build your own sonar ranging system. Some application may use this circuit such as robot applications, body height… Read More »

White Line Follower

This is the circuit diagram of white line follower toy. The actuator of the toy is the DC motor. This circuit can be used for a toy car to follow a white line, this circuit also known as very simple robot: “line follower without microcontroller”. The motor is either a 3v type with gearing to steer the car or… Read More »

Arduino UNO

Here the Arduino UNO schematic diagram (click to enlarge): About Arduino UNO: The Arduino Uno is really a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 may be employed as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP… Read More »

Tone Detector / Sound Activated Switch

The following circuit diagrams are tone detector circuit diagrams which also known as sound activated switch circuit. Actually, these circuits  use microntroller for switching because the circuits were designed for robot start up activation. But you can build switching module using relay. You may make a trial to use this circuit for other applications such… Read More »

ATmega8535 Line Follower Robot

This is the circuit diagram of ATmega8535 Line Follower / Line Tracker robot. The circuit taken from the tutorial documentation. You may download the full tutorial at the end of this article. The ATmega8535 line follower robot uses 8 pieces of proximity sensor module. The sensor module use photodioda for detecting the reflection of light… Read More »

ATmega16 Line Follower Robot

Here the complete electrical circuit diagram of line follower robot which built based on ATmega16. There are three modules of line follower robot circuit that are sensor module, microcontroller module and DC motor module. IR sensor schematic diagram: The robot uses IR sensors to sense the line, an array of 8 IR LEDs (Tx) and… Read More »



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