Features: Standard for 40PIN GPIO extension header, supports for series boards, Nano Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate Onboard DAC8552, 2ch 16bit high-precision DAC Onboard input interface via pinheaders, for connecting analog signal.Onboard input/output interface via screw terminals, for connecting analog/digital signal Features AD/DA detect circuit, easy for signal demonstration for GPIO interface: for connecting with for Pi AD/DA input/output: screw terminals AD input: pinheaders, the pinout is compatible with for sensor interface standard, easy to connect various analog sensor modules 7.68M crystal LM285-2.5: provides reference voltage for the ADC chip Photo resistor LED output indicator 10K potentiometer DAC8552: 16bit high-precision DAC, 2ch Power indicator ADS1256: 24bit high-precision ADC, 8ch (4ch differential input) ADC testing jumper DAC testing jumper Power selection jumper ADC reference ground configuration : when AD single inputted, the AINCOM is reference terminal, can be connected to GND or external reference voltage Material: plastic colour: blue Package Contents: 1 x Digital Analog Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.