Raspberry Pi High-Precision AD/DA Board

There's no AD/DA function on the Raspberry Pi GPIO interface, this may trouble you in the Pi projects to read the analog current and voltage. However, the High-Precision AD/DA Board allows you to add high-precision AD/DA functions to the Raspberry Pi.

The analog-to-digital converter(ADC) converts an analog signal to digital. An ADC could help Raspberry Pi computers convert input analog voltage and current to a digital number to represent the data of the voltage and the current.  

Supported Raspberry Pi Models 

• Raspberry Pi 1 Model A+
• Raspberry Pi 1 Model B+
• Raspberry Pi 2 Model B
• Raspberry Pi 3 Model B/B+
• Raspberry Pi 4 

Features 

• Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate

• Onboard DAC8532, 2ch 16bit high-precision DAC

• Onboard input interface via pin headers, 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 demonstration

Hardware Overview 

1. Raspberry Pi GPIO interface: for connecting with the Pi

2. AD/DA input/output: screw terminals

3. AD input: pin headers, the pinout is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules

4. 7.68M crystal

5. LM285-2.5: provides the reference voltage for the ADC chip

6. Photoresistor

7. LED output indicator

8. 10K potentiometer

9. DAC8532: 16bit high-precision DAC, 2ch

10. Power indicator

11. ADS1256: 24bit high-precision ADC, 8ch (4ch differential input)

12. ADC testing jumper

13. DAC testing jumper

14. Power selection jumper

15. ADC reference ground configuration: when AD single inputted, the AINCOM is reference terminal, can be connected to GND or external reference voltage 

Interface Definition 

Dimensions

Part List 

Raspberry Pi High-Precision AD/DA Board＊1