GPIO pinout explorerRaspberry Pi, Pico, ESP32 and Arduino Uno pins, tap by tap.Ohm's law calculatorVoltage, current, resistance and power from any two values.Resistor colour code4, 5 and 6 band resistors, both directions.LED resistor calculatorThe right resistor for any LED and supply.Binary and hex converterDecimal, binary, hex and octal side by side.