I started working on my pcb design to support Project Dodo. I find designing my own PCBs liberating as it is a huge tool to make anything possible.

I am now working the engine control unit for Project Dodo. It has two 200kHz analog to digital converters (ADC) with active filtering and gain stages as well as 4 low-speed ADCs for a loadcell, tank pressure and two thermocouples. It drives two 8v 8amp servos to control our main valves. This board will produce 400kb/s of data and runs on an rp2040 running embedded rust. It communicates to the flight computer over rs232. It is still in development though, so nothing to show yet.

The boards below are analog to digital converters on an I2C bus. They are used for rocket engine ground testing. The ones in the stack are flexible PCBs that can be set up for a variety of interfaces such as 4-20mA, 0-10V, 0.5-4.5V, or fully differential bridge measurements. We use them on our system for our loadcells, thermocouples and chamber pressure sensors. The triangular-shaped PCB directly mounts on sensors. However, we have decided this is too risky for the PCB and will move to short-shielded cables for better reliability and handling.