Electronics chapter

General words of caution

• Isolate the grounds of power and signal circuitry
• Prototype a PCB before ordering it.
• Make soldered connections before changing anything else.
• Check code before changing circuitry.

Component sellers

• KTron
• Robu
• Electronics Comp

PCB Manufacturing

• JLCPCB
• NextPCB

Quirks of devices

• NodeMCU
• MFRC522