Raspberry Pi High-Precision AD/DA Board

Reference: SEEED 114990831

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

What's on Board (check out additional photo)

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

GPIO Interface Definition

Symbol	Pin	Description
3.3V	1, 17	Power supply (3.3V)
5V	2, 4	Power supply (5V)
NC	3, 5, 7, 8, 10, 18, 22, 24, 26, 27, 28, 29, 32, 36, 38, 40	NC
GND	6, 9, 14, 20, 25, 30, 34, 39	Ground
DRDY	11	ADS1256 data ready output, low active
RESET	12	ADS1256 reset input
PDWN	13	ADS1256 sync/power off input, low active
CS0	15	ADS1256 chip select, low active
CS1	16	DAC8532 chip select, low active
DIN	19	SPI data input
DOUT	21	SPI data output
SCK	23	SPI clock
GPIO	31, 33, 35, 37	extend to sensor interface

Part list

Raspberry Pi High-Precision AD/DA Board＊1

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Manufacturer	Seeed Studio
Manufacturer's model	114990831
Measures	65 x 56 mm
Compatible	Raspberry Pi 4

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