I’m quit new to Photon, but have some experience with Arduino and NodeMCU.
Now I have a new challenge, because I want to automate my greenhouse with a Photon. The last years version was built with an Arduino.
My issue is, when I connect a 5V relay board to the Photon, i can switch all relays, but it I switch two at the same time, the photon reboots after some seconds. When switching on three, the Photon reboots after 3 seconds and if I switch all four, it reboots immediately.
it is a Arduino compatible 4 relay board, bought at Amazon. Connected to +5V and GND parallel to the Photon. Switch vis D2-D5. But bko’s idea was the right