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Arduino line follower with PID and 90 degree turns
ESP8266 as a Microcontroller
PID Control For CPU Temperature of Raspberry Pi
IR Near Proximity Sensor
How to Make a "Touch Sensor" Using 555 Timer IC on Breadboard.
Tinker's Word Clock - REVISITED! NOW 110% more AWESOME (Clean and easy to make)
Building Small Robots: Making One Cubic Inch Micro-Sumo Robots and Smaller
Simple Light Following Robot