Nano 33 and 8 channel relay module unwanted startup activation

I have all the parts except the 1N5819, it was sold out :frowning:
They did have a 1N4148 though so I'll connect that and replace it with the Schottky later, assuming that's not an issue with the other parts.

I'll use the schematic from #24 (thanks Larry) and replace the 100K resistor with the 1M resistor and add the Schottky later (thanks Leo).

One thing that caught my attention is you have the external power for the relay module connected to the GND next to the input pins instead of the GND next to the JD-VCC pin (or next to the VCC pin next to that to be precise). Does that matter or is either a good point?