Low-Cost GHG Measurement Sensors

I spent the summer of 2024 working on low-cost GHG measurement flux-chamber sensors, for the Stanford Terrestrial Carbon Cycle group. I worked on the firmware, software, and hardware of these sensors, to trouble-shoot power management issues, create an accessible user interface, and debug firmware.

First, I created a user interface in python that connected to the firmware in Arduino IDE, that allowed the users to customize their settings and view a data stream. The software also allowed users to get a status check on the peripherals on the board, and even return the sensor to a factory setting! I made this so that the scientists using this device don’t have to touch the firmware, or any code at all, in order to customize and interface with their boards, which before was not an option.

Second, I designed the next iteration of sensor PCB’s for the group, troubleshooting power bugs and optimizing for efficiency. I turned the previously 2-Layer board into a 4-layer board, went through each component’s datasheet and added more robust decoupling and bypass capacitors, optimized traces and vias on the board, and adjusted the placement of components. I eliminated some components, added some components, and made the board smaller and more compact. I also created a development board, for testing different voltage regulation circuits, clocking circuits, and power systems for the CO2 sensor and SD card. I then received these board, brought them up, and continued to troubleshoot and test until the end of the summer.

Due to intellectual property concerns, I can’t attach any photos of what I did during this internship, but trust me, it was awesome.