Arduino
Colour-sorting machine: making a TCS3200 tell red from orange
A sensor that reports colour as three frequencies, and the calibration that turns those into an answer. Why the white-balance step is the whole project, why the LEDs...
Arduino
Gesture-controlled robot: tilt your hand, the car moves
A glove with a gyroscope on it, a robot 30 metres away, and no lag. Reading tilt from an MPU6050 without the drift everyone complains about, and getting...
Advanced
Six-servo robotic arm on a PCA9685: power budget, pulse limits and smooth motion
A six-servo arm is where hobby robotics stops being about code and starts being about power. Why 150 and 600 are the wrong pulse counts for your servos,...
Arduino
Obstacle-avoiding robot with a scanning ultrasonic head
The standard obstacle avoider hits something, reverses and turns at random. Adding one servo turns it from a bumper car into something that surveys the room and picks...
Arduino
Line-following robot that actually follows the line: sensor spacing, proportional control and why yours weaves
Most line followers wobble down the track like they are drunk, and "reduce the speed" does not fix it. The oscillation is a control problem. Sensor spacing, per-sensor...
