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...
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
Driving 12 servos from one board: PCA9685 wiring, power and pulse ranges
Six PWM pins is not enough. How to wire a PCA9685 correctly, budget the power supply so your board stops resetting, and work out the pulse counts instead...
