After having verified that everthing is ok (electronic prototype and sketch) it’s now time to develop the PCB for my Nixie thermometer.
I opened Eagle and drew the schematics:
I then started to design the PCB. The request was that it should have been round and as small as possible. Therefore I decided to place the components on both sides, with the biggest modules (the power supply and the Arduino pro Micro) on the bottom one.
The result is as follows:
It’s very important during this phase to verify that everything is properly connected: it’s indeed better to spend a couple of minutes now, than receive a wrong PCB from the service two-three weeks later. For this reason, I printed the drawings (top and bottom layers) at double size and I checked – with the help of a marking pen – all the connections comparing them with my perfboard prototype:
Once verified that everything was ok, I prepared the Gerber files and sent them to my service (for this project I chose Elecrow).
In my repository on Github you can download the Eagle files and also a ZIP archive that includes all the required Gerber files, ready to be uploaded on the service’s website.