Introduction

In this project, I show you two things. One is a new version (v1.2) of my custom DAQ based on the ADS1256 AD converter and Atmega32u4 microcontroller. I slightly compressed the size of the board, added a USB-C connector to it, and added some more obvious text on the silkscreen. Another update is the software itself. The library is now officially in the Arduino’s library catalogue. So, if you search for ADS1256 in your Arduino IDE, you will find my code there.

The Library

The ADS1256 Arduino-compatible library has already been discussed in my previous video, so I won’t do it again. It also has a GitHub page and it also has an extremely detailed documentation (see, GitHub page).

I tested the library with eight different microcontrollers so far, and all of them worked correctly:

1. Arduino Nano*
2. Arduino Uno*
3. Arduino Mega 2560*
4. Teensy 4.0
5. Atmega32u4
6. ESP32 WROOM 32
7. STM32F103C8T6
8. STM32F401CCU6

*These microcontrollers are probably too slow (or my code is not efficient enough), therefore at 30000 SPS, the actual sampling rate becomes somewhere around 29700 SPS. The other MCUs seem to produce a bit above 30000 SPS at full data rate setting.

I designed a 3D-printable enclosure for the board. It consists of two pieces, a top piece and a bottom piece. The enclosure requires the following parts:

1. 4x M3x6x5 knurled brass insert nuts
2. 4x M3 nylon washers (id: 3 mm, od: 8 mm, t: 1 mm)
3. 4x M3x10 mm socket countersunk bolts