Description
Note
Want to add AD/DA function to your Raspberry Pi 4? We recommend our Grove Base Hat for Raspberry Pi ($9.90) to you!
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
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Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate
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Onboard DAC8532, 2ch 16bit high-precision DAC
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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
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Onboard input/output interface via screw terminals, for connecting analog/digital signal
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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
| 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 |
Dimensions
Part List
Raspberry Pi High-Precision AD/DA Board＊1
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