We see an Arduino Uno connected to the classic HC-SR04 ultrasonic distance sensor, an LED, and we have to assume a USB battery pack.

One of the keys to efficient cycling performance is a consistent pedalling cadence. To achieve this the cyclist must always be in the correct gear, which can be tricky when your legs are burning and ...

Thankfully, you can offer some structure to your pursuit of electronics knowledge with the SainSmart UNO for Arduino microcontroller board.