The ADC-DAC Pi Zero is a 2 channel 12 bit analogue to digital converter and 2 channel 12 bit digital to analogue converter designed to work with the Raspberry Pi. Designed for the same footprint as the Raspberry Pi Zero the ADC-DAC Pi Zero is also compatible with full size Raspberry Pi models.
The ADC-DAC Pi Zero is based on the Microchip MCP3202 A/D converter containing 2 analogue inputs with 12 bit resolution with a Microchip MCP4822 dual channel 12-bit DAC with internal voltage reference.
Power to the board is provided through the host Raspberry Pi using the GPIO port. Only one ADC-DAC Pi Zero can be used on a Raspberry Pi but the extended pins on the GPIO connector allow you to stack the ADC-DAC Pi Zero along with other expansion boards. Mounting holes on the board can be used to securely fit the board on your Raspberry Pi. As the ADC-DAC Pi Zero uses the same footprint as the Raspberry Pi Zero only two of the mounting holes can be used on the larger Raspberry Pi models.
The A/D and D/A converters communicate with the Raspberry Pi through the SPI interface.
Max ADC Sample Rate using Python library on a Pi 4: 11,000 samples per second.
Max ADC Sample Rate using C library on a Pi 4: 17,500 samples per second.
Max ADC Sample Rate using C++ library on a Pi 4: 17,500 samples per second.
Max ADC Sample Rate (based on MCP3202 datasheet): 50,000 sps at 2.7V. 100,000 sps at 5V. ADC-DAC Pi operates at 3.3V on Raspberry Pi.
The ADCDAC Pi Zero is compatible with all Raspberry Pi models from the A+ and B+ onwards.
Not sure which ADC you need ? Check our Analogue to Digital Buyers guide to compare our ADC expansion boards.
Specifications
Input Ratings & Specifications
- Spec
- Ratings
- Vdd
- 3.3V
- ADC Input Voltage
- 0V to 3.3V
- Maximum ADC Input voltage
- VSS–0.6V to VDD+0.6 V
- DAC Output Voltage
- Gain = 1: 0V to 2.048V
Gain = 2: 0V to VDD
- Maximum DAC Output Current
- 25mA
- SPI voltage
- 3.3 V
3D CAD Model
ADC DAC Pi Zero - 3D CAD File (STEP Format)
Schematic
Click to download schematic PDF.
Mechanical Drawings
Click image to enlarge
Assembly
The ADC DAC Pi Zero is supplied with the 40 pin GPIO connector unsoldered. We supply the ADC DAC Pi Zero this way because the Raspberry Pi Zero is also supplied without a GPIO header and the ADC DAC Pi Zero could therefore be fitted both above or below the Raspberry Pi Zero.
Before using the ADC DAC Pi Zero you will need to solder the connector onto the PCB.
PCB Header Assembly Jig
Download and print our PCB Header Assembly Jig to hold your circuit board when soldering the header pins.
Compatibility
| Model |
Status |
| Raspberry Pi Model A |
 |
| Raspberry Pi Model B |
|
| Raspberry Pi 1 Model A+ |
 |
| Raspberry Pi 1 Model B+ |
|
| Raspberry Pi 2 Model B |
|
| Raspberry Pi 3 Model B & 3+ |
|
| Raspberry Pi 4 |
|
| Raspberry Pi Zero |
|
| Raspberry Pi Zero W |
|
Code Libraries and Demos
We have Python, C, C++, Node.js and Windows 10 IOT libraries available for this expansion board. You can download all of the libraries from github at:
https://github.com/abelectronicsuk/ or click on the logos below for your selected programming language,
Datasheets
MCP3202
MCP4822