![an-esp-makes-a-bicycle-odometer-[hackaday]](https://i0.wp.com/upmytech.com/wp-content/uploads/2024/08/202422-an-esp-makes-a-bicycle-odometer-hackaday.jpg?resize=800%2C445&ssl=1)
An ESP Makes A Bicycle Odometer [Hackaday]
If you’d like to measure the speed of your cycling then it’s easy enough to buy a cycle computer, but as [Clovis Fritzen] has done it’s also an option to build one. The result of his work is a smart PCB on which the speed is indicated with a row of LEDs.
The sensor is a straightforward affair, a reed switch with a magnet on a wheel, which is sensed by an ESP8266. The six LEDs are charlieplexeed over three lines. To keep the supply voltage correct for the ESP from the uncertain state of a lithium battery, a small buck-boost module is used. Sadly the code doesn’t seem to make the speed available via the wireless part of the processor, but we’re guessing that a bit of extra software work could fix that.
The result when put in a box on the handlebars, is a smart but simple instrument that would aid any bike. It’s by no means the first one we’ve brought you and we doubt it will be the last.