Raspberry Pi High-Precision AD/DA Expansion Board
Description
- Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate
- Onboard DAC8552, 2ch 16bit high-precision DAC
- Onboard input/output interface via screw terminals, for connecting analog/digital signal
- Features AD/DA detect circuit, easy for signal demonstration
There's no AD/DA function on the Raspberry Pi GPIO interface, this may trouble you in the Pi development. However, it won't be a problem anymore. The Raspberry Pi High-Precision AD/DA Expansion Board allows you to add high-precision AD/DA functions to the Raspberry Pi.
- High-Precision AD/DA Board x 1
- RPi screws pack (2pcs) x 1
ZIP File
- Raspberry Pi GPIO interface : for connecting with the Pi
- AD/DA input/output : screw terminals
- AD input : pinheaders, the pinout is compatible with Waveshare 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
Supported Pi
- Raspberry Pi 1 Model A+
- Raspberry Pi 1 Model B+
- Raspberry Pi 2 Model B
- Raspberry Pi 3
- Raspberry Pi 3 Model B+
- Raspberry Pi Zero
The A/D portion of this board was recently added to Mycodo - a graphical sensor and controller environment that runs on raspberry pi. https://github.com/kizniche/Mycodo There is a python library that will work with the A/D named PiPyADC https://github.com/ul-gh/PiPyADC Python cannot sample above about 1k samples per second, however lower speeds are required for precision.
The RB-WAV-08 is an ideal platform for interfacing with analog systems through the PI Raspberry platform. The board is high quality, easy to work with, and comes from the factory with an on-board light sensor, potentiometer and LED's to test board functions. On a side note, I had a bit of trouble with my PI 3, unrelated to the RB-WAV-08 board, and customer service from Robotshop responded to my support request in a few hours and I was able to resolve the problem. I followed the instructions downloaded in the documentation package from Robotshop and had the software compiled and working in about 3 minutes. Thanks to the on-board pot and led's I could immediately test the software. Overall, I'm impressed. This is a well supported, high quality board at a bargain price.
The product is original make, and arrived reasonable fast by regular mail. Nothing seems broken. Fits perfectly to raspberry pi. Haven't done actual testing yet, but I don't expect problems from its looks. Thanks guys!
The hardware worked as advertised *after* I spent several frustrating hours deciphering the schematics and writing my own Python drivers to talk to it. If the board came with solid docs and code, I would have given it a 5. If you're looking for Python interface code, I've open sourced mine which makes use of 2 other projects (one for the ADC, one for the DAC). https://github.com/makahn64/waveshare_a2d_d2a_python
Nice board, didn't use it with a pi but with a Cypress PSOC 4.
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