DEFUNCT Raddatz (劉愷恩) -> now at nerdica September 27, 2021 2:47pm Did I post this before? I forgot. Get three free* PCBs for CO2 sensors and the like here, if you're a maker: https://docs.google.com/forms/d/e/1FAIpQLSdJxizUbGHxDAOmE7dWs0ChK2b0Y4Luq-xcmPiuVh7W7vMBQg/viewform #diy #sensors #hardware #makers AirGradient DIY PCB and Kit Order Form Great that you want to build an air quality sensor. Since we got many requests for PCBs and kits with components, we created this order form. Please indicate what product you would like to get, leave your postal address and paypal address. Once...