What is it?

In short, it's a 24 channel ADC and 8 channel Pulse Width Modulation generator on one single board.

12 bit, 24 channel single ended Analog to Digital Converter (ADC) with 8 channel 16-bit around half MHz PWM output or less bits with higher frequency. Communicates with Arduino, Raspberry Pi using I2C bus.

The PWM generator is very high-frequency which means with a proper 2nd Order Passive RC Low-Pass filter it can give you a nice DC voltage like a DAC. If you're fancy you can use a Sallen & Key filter. The PWM output can be used to control any LED driver, motor driver, simple MOSFET gate driver etc. The frequency can be reconfigured upon on request.

The power supply requirement is DC 5V. IO pins are 3.3V which makes it compatible with the latest Arduino, Raspberry Pi, BeagleBoard, Teensy, ESP32 or any other Dev boards available nowadays.

Why did you make it?

It's a byproduct of one of my projects, but it's versatile enough to share with the community.

What makes it special?

With the proper header, multiple boards are stackable. There are already mounting holes on the board if needed.

One special feature is that you can select any of the 112 unique (7-bit) I2C addresses if you respect the I2C specification. And, the possibility is there to exploit all 128 addresses if you want it. So basically in a multi-board configuration, theoretically the available channels are HUGE.

On board, there is a high precision voltage reference which gives you more accurate readings.

Docs and examples

Simple Arduino example is provided after purchase. I2C signal diagrams available too, so you can port it to any system if it has an I2C port.

Specs

• ADC resolution is 12bit single ended
• Input range is 0-3.3V for the 3.3V voltage reference or can be 0-5V with a 5.0V voltage reference.
• The power supply requirement is DC 5V with the a 3.3V voltage reference, otherwise it's DC 7-12V.
• Maximum ~11k SPS per channel
• PWM resolution is 16bit
• I2C bus speed is 100 kbit/s, standard mode.

Docs and examples

For Arduino, Linux C and Python examples please click on the 'source code' link. I2C signal diagrams available too, so you can port it to any system if it has an I2C port.

Happy hacking!

Color of the PCB can be different due the different PCB manufacturer.

Some improvements since Feb of 2021:

• True 12bit ADC
• Internal VREF added as option.ption.