# Turns on each pin of an mcp23017 on address 0x20 ( quick2wire IO expander ) import wiringpi pin_base = 65 i2c_addr = 0x20 pins = [65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80] wiringpi.wiringPiSetup() wiringpi.mcp23017Setup(pin_base,i2c_addr) for pin in pins: wiringpi.pinMode(pin,1) wiringpi.digitalWrite(pin,1) # wiringpi.delay(1000) # wiringpi.digitalWrite(pin,0)