SCRATCH for interaction​ ARDUINO with SCRATCH We providing a SCRATCH board and 328 control board included sliding resistors buttons photoresistors and microphone voice module. Combined S4A software we can get a variable resistor changes from Arduino and then converted into a numerical read Scratch program. 1 Scratch sensor board using Arduino Nano development board supports Windows XP Windows 7 X32 / X64 operating systems 2 Scratch external resistor sensor using audio terminal convenient to use. 3 Scratch sensor with nice compatibility S4A software.