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Newly Updated Circuit Projects:

Speed Dependent Brake Light Circuit

Last Updated on May 16, 2026 by Swagatam 9 Comments

Tachometer

In this post I have explained an innovative brake light circuit using speed detection of the vehicle which could be a motorcycle. The circuit implements an advanced brake light switch ON ensuring a much safer riding experience for the user. The idea was requested by Mr. Rayan. Circuit Objectives and Requirements I have an idea, […]

Filed Under: Automobile Electronics Tagged With: Brake, Dependent, Light, Speed

Solar E Rickshaw Circuit

Last Updated on May 16, 2026 by Swagatam 15 Comments

Electric Rickshaw

In this post I have explained a simple solar electric rickshaw or E rickshaw circuit which can easily built by anybody at home and used with a locally fabricated vehicle. The idea was requested by Mr. Amit. The Design Selecting a BLDC In one of my earlier posts I presented an idea which could be […]

Filed Under: Automobile Electronics, Solar Controller Circuits Tagged With: Rickshaw, Solar

10 LED Tachometer Circuit Diagram

Last Updated on May 16, 2026 by Swagatam 102 Comments

102BLED2Btacho

In this post I have explained how an accurate 10 LED tachometer circuit can be built using ordinary parts like IC 555 and IC LM3915. The idea was requested by Mr. Munsif. What is a Tachometer A tachometer is a device which is used for measuring vehicle engine RPM. Thus, it is basically used for […]

Filed Under: Automobile Electronics Tagged With: LED, Tachometer

Bluetooth Car Ignition Lock Circuit – Keyless Car Protection

Last Updated on May 16, 2026 by Swagatam 25 Comments

mainsremote

This circuit will allow the user to lock his car ignition using his phone Bluetooth, meaning the ignition can be locked/unlocked only through a specific code from the user’s cellphone Bluetooth. Overview In one of my earlier posts I have already explained how to hack a Bluetooth headset and use it for any desired switching […]

Filed Under: Automobile Electronics, Remote Control Circuits Tagged With: Bluetooth, Ignition, Keyless, Lock, Protection

Ultrasonic Fuel Level Indicator Circuit

Last Updated on May 16, 2026 by Swagatam 53 Comments

fuel installation

An electronic device or circuit which detects and indicates the various fuel levels in a fuel tank without a physical contact, through ultrasonic waves, is called an ultrasonic fuel level sensor In this post I have explained how to build a simple fuel tank level indicator circuit using Arduino and ultrasonic sensors. In every vehicle […]

Filed Under: Arduino Projects, Automobile Electronics Tagged With: Fuel, Indicator, Level, Ultrasonic

Motorcycle Button Start Locking Circuit

Last Updated on May 16, 2026 by Swagatam 4 Comments

speed2Blimit

In this post I have explained how to modify an existing button start system in motorcycles so that it’s disabled as soon as the engine has started and gained the required minimum amount of RPM. The idea was requested by Mr. Jordan Circuit Requirements I just discovered your splendid site/blog with focus on education about […]

Filed Under: Automobile Electronics Tagged With: Button, Locking, Motorcycle, Start

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