Now that I have headers and pins soldered on the CO detector, I’m ready to start taking some measurements with my test equipment. As I mentioned before, I prefer to use them in a certain order. First I’ll start by taking resistance measurements with my multimeter. One of the header pins is labeled GND1. I want to test if this ground is common to some other points on the board. Besides the negative battery terminal, this pin was also common … Continue reading CO Detector Hack – Part 2