There’s no AD/DA function on the Raspberry Pi GPIO interface, this may trouble you in the Pi development. However, it won’t be a problem anymore. The High-Precision AD/DA Board allows you to add high-precision AD/DA functions to the Raspberry Pi.DOCUMENTATIONSupported Pi Raspberry Pi 1 Model A+ Raspberry Pi 1 Model B+ Raspberry Pi 2 Model B Raspberry Pi 3 Model BFeatures Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate Onboard DAC8532, 2ch 16bit high-precision DAC Onboard input interface via pinheaders, for connecting analog signal the pinout is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules Onboard input/output interface via screw terminals, for connecting analog/digital signal Features AD/DA detect circuit, easy for signal demonstrationWhat’s on BoardRaspberry Pi GPIO interface :for connecting with the PiAD/DA input/output :screw terminalsAD input :pinheaders, the pinout is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules7.68M crystalLM285-2.5 :provides reference voltage for the ADC chipPhoto resistorLED output indicator10K potentiometerDAC8532 :16bit high-precision DAC, 2chPower indicatorADS1256 :24bit high-precision ADC, 8ch (4ch differential input)ADC testing jumperDAC testing jumperPower selection jumperADC reference ground configuration :when AD single inputted, the AINCOM is reference terminal, can be connected to GND or external reference voltageInterface DefinitionPinSymbolDescription1, 173.3VPower supply (3.3V)2, 45VPower supply (5V)3, 5, 7, 8, 10, 18, 22, 24, 26, 27, 28, 29, 32, 36, 38, 40NCNC6, 9, 14, 20, 25, 30, 34, 39GNDGround11DRDYADS1256 data ready output, low active12RESETADS1256 reset input13PDWNADS1256 sync/power off input, low active15CS0ADS1256 chip select, low active16CS1DAC8532 chip select, low active19DINSPI data input21DOUTSPI data output23SCKSPI clock31, 33, 35, 37GPIOextend to sensor interface