Quick question, I've managed to initiate power down mode using 5v from the arduino (led pin 13). Only thing is, it only works if going through my multimeter. The multimeter running is in series measuring 5v dc going from pin 13 to the SCK pin on the hx711 module. If I connect pin 13 directly to the SCK pin, sleep mode crashes and the screen shows random characters. I assume this is because pin 13 is messing with the digital signal coming from the module.
Could it be that the circuit is missing a resistor? I don't have any close right now so I can't try unfortunately. How many ohm should the resistor be?