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I would suggest you get an electrician to come look at your house. If the previous owner did some ****** wiring it could cause a fire or electrocute you and you die. You should have no voltage across the neutral and gnd with nothing drawing current on the circuit. And 120v from either to hot...

One other note regarding the 8266. Some pins are used during boot, such as D4 on the NodeMcu, and I had a ssr wired to it. It needs to be pulled up at boot, and I think that the ssr was acting as a pulldown resistor causing the board not to boot. If I disconnected the ssr then booted, I could...

I recreated this issue in an Arduino sketch using a NodeMcu and a DS18B20. I used the OneWire Library and the DS18X20_Temperature example sketch. I first ran the sketch as is and viewed the serial monitor. Then I added an analogWrite(anotherPin, 12) at the start of the loop and reuploaded. The...

I ran a PWM output sweep on my MEGA, with only 1 onewire sensor connected, and there was no problem. So, it seems that this is a 8266 related issue.

If the ESP32 firmware correctly implements the PWM range, you might need to try like 4 on your PWM output.

@NateBrew Interesting! I unplugged everything from my 8266 and turned off all other devices in my panel, and just plugged in 1 onewire sensor, and the issue is still there. This makes me think it is native to the firmware or hardware of the 8266. I wonder if this issue happens with other boards...

If you have a minute, can you create a PWM output on an unused pin on one of your 8266s and then set it to 12, and check if you get problems with the onewire sensors?

@NateBrew what length cables are your onewire sensors on, and how are they wired and connected to your board? On mine, each DS18B20 is on a 3M cable, connecting to a connector bus, where I have a 2.2K pullup and a 10uF cap (across +/-). As I pointed to in my previous post, this is a star...

The esp8266 pins are 5V tolerant in most cases. I'll try with 3.3V though to see if there is a difference, but I doubt it. I will try shielded cables.

So, further chaos with onewire. I had edited my previous post, where I found that my 24VDC pumps were causes havoc with my onewire readings while running (via PWM or just high on the PWM pin). So, I isolated them to a different interface and power. Onewire was solid until, I was doing some...

@BrunDog Is there any way to force a PWM pin to be used as a duty cycle in the PID element? I would like to use an ESP8266, which has all PWM pins, to control a fermentation fridge/heater which would need duty cycle PID. I would like to use the D1 mini due to the size and I already have tons of...

Is there a significant advantage over the ~$5 ESP32?

I am posting this here for anyone having problems in the future, hopefully they can find this with a search. A heads up for anyone using onewire (1wire, 1-wire) temp sensors (like the DS18B20). I was having issues with my sensors dropping and getting bad readings constantly. To solve the...

Is there any voltage across your neutral and ground? I assume your outlets are 3 prong, since you said your panel power on your AC Power is grounded. Are your outlets wired correctly? Meaning do you have a separate ground conductor going from your outlet to the main breaker panel? The ground and...

I missed the part about the old house wiring. We will definitely need the answer for 7 ASAP as this is likely the source of the problem. I'm going to guess you have 3 prongs on the AC unit and 2 on the led/heat lamp?

It looks like you have 2 GND wires going into the DC devices. You only need 1 wire and having 2 can cause issues. I think your problem lies with the way you have your grounding set up for your DC side. Edit: On the Salon board there are 2 GND, one for the 24V coil power and one for the signal...

Do you have a picture of the physical wiring on the main panel? How are all of your DC- points tied together? You mention your earth ground is connected to the DC- paths. How is that wired physically? Do you have an updated picture of the sub panel? Also in your diagram, is your 24DC- line tied...

All of the GND pins on the arduino and the sensors are all common and tied together. They are so you can wire multiple devices to the board without having to stuff multiple wires into one socket. So the behavior has changed to happening with no load? Back a couple pages, it was only when you...

Is there a way to use temp sensors from one interface to drive a PID on another?

Have you tried powering the Arduino with its own separate power supply and isolate it making sure no ground/- is common with he rest of the circuit?