Arduino-ADS1220-SPI-BitBang ADS1220 SPI ACD interfacing with arduino using BitBang SPI. ADS1220 Breakout board from Protocentral. BitBang SPI ArduinoPinMap for ADS1220 24BIT SPI ADC SCK_ads = 13; MISO_ads = 12; MOSI_ads = 11; DRDY_ads = 6; CS_ads = 7;