Look like the relay board already has a diode across each relay. Is it possible the pcf8574 is just more sensitive ?

The problem only occurs when turning off a powered solenoid (both relay and solenoid de-energize), but does not occur when solenoids are disconnected (only relay de-energizes). If that is the conditions then I would say the PCF8574 is being reset due to the solenoid's EMF inductive "kick"...

Do the relays need a ground signal or a positive signal to actuate? The PCF8574 can deliver way more current with a ground signal than a positive signal. This may or may not be the problem but something to check. Good question, will need to check ! Just confirmed it's a ground signal to activate th...

budman1758 wrote: ↑24 Sep 2019, 01:33 Do the relays need a ground signal or a positive signal to actuate? The PCF8574 can deliver way more current with a ground signal than a positive signal.
This may or may not be the problem but something to check.

Good question, will need to check !

rudloffl wrote: ↑23 Sep 2019, 19:17 Are you powering the relays from the PCF8574 or are you using the JD-VCC on the relay board ?

I took off the jumper and power the relay directly

The 8 channel relay boards are powered directly from the power supply i believe.

Hi,

Yes loads are completly isolated. I have uploaded a picture.

The esp does not reboot when all the relays go off.

Just changed out the supply with a new one at 1.5 amps & also tried powering the pcf8574 direct from 5v without luck.
.

What is the current needed for driving the whole setup? Could it be a too small 5V power supply?

Not sure, most of my 5V supplies are 1amp. I might swap the supply out just to be sure. I have already swapped out the PCF8574 & relay boards.

Hi, Long time espeasy user, but have run into the first problem i need some help with. I have just added a PCF8574 board to my Wemos D1 Mini to enable me to drive more relays for my irrigation system. Everything seems to work as expected, i can turn each relay on/off etc, but ONLY when there is no l...