load control with esp32

[noxin]

hello,

I have an electricity consumer, an aquarium heater, that I want to check whether it switches on and off. I tried in vain to work with an acs 712. The ACS 712 is not suitable for the voltage of the local network, 230 V. What I need is simply to check whether a load of around 300 watts is being switched, an exact measurement is not necessary. Has anyone of you already implemented something like this and can give me a little support?

[Ath]

A simple solution could be to use an ESP-based smart plug, like a Shelly or similar, with power measurement support, that can be loaded with an alternative firmware (ESPEasy of course ), install a matching build that includes P076 (HLW8012/BL0937) or P077 (CSE7766) that will provide information about the power delivered.
You then also have the option of selectively turning it off or on.

[TD-er]

Sonoff has several modules like these called "POW" (various editions with imaginative names like POW/POW-r2/POW-r3)
The earlier ones weren't that "well designed", so I would not trust those to handle large currents.

However the newer R3 versions are quite nice with a display and running an ESP32.
Those Sonoff POW ones are not "wall plug" versions, but more "DIN rail" and you need to screw in the wires in screw terminals.

[uah007]

What I need is simply to check whether a load of around 300 watts is being switched, an exact measurement is not necessary.

This device fully meets your request.

[Rob73]

For my electric water heater I use a 220 volt relay. When the element kicks on, it pulls in the coil and its totally isolated from my esp modules. Works great. I use 24 volt ones on my ac unit for when the fan kicks on and it goes to heat or ac. I also use one on my deep well pump. I dont know if they will work in your situation, but they work great for what I need. I could not find any other good way to indicate whether these devices were running. But the relays work great.

Robby

[noxin]

Thank you very much for your answers!

I would like to couple the load sensor with a relay and a 1wire temperature sensor via a rule, so the reference to uah007 would be helpful.
Sometimes aquarium heaters have a tendency to fail when the temperature is reached, hence the relay.
Unfortunately, I didn't find exactly this sensor that uah007 pictured. I found this: AC Digital PZEM-004T Multifunction Meter with clamp.
is this comparable?
@TDer: do these kind of sensors use "Serial Helper" in espeasy ?

[uah007]

Sometimes aquarium heaters have a tendency to fail when the temperature is reached, hence the relay.

I think you only need a temperature sensor and one relay module. Use the plugin "Regulator - Level Control" and set up "Email Notifications (SMTP)" to send emails.
A rule that will check the temperature and send you an email about a heater malfunction could look like this

Code: Select all

On ds18b20#temperature<22 Do // The temperature dropped below 22°.
   If %Uptime%>30 And %v1%=0 // 30 minutes have passed since the power was turned on.
     Let,1,1
     notify 1,"{jimmydean@domain123.com},Check the heater!<br>Water temperature is 20 degrees.<br>Uptime %Uptime% ","Aquarium"
  Endif
Endon

Link to AC Power Monitoring Module
https://www.aliexpress.com/item/4001125 ... ry_from%3A

[Ath]

I would like to couple the load sensor with a relay and a 1wire temperature sensor via a rule, so the reference to uah007 would be helpful.
Sometimes aquarium heaters have a tendency to fail when the temperature is reached, hence the relay.

That's why a smart-switch would be quite useful, simple 'plug and play' solution

[TD-er]

Thank you very much for your answers!

I would like to couple the load sensor with a relay and a 1wire temperature sensor via a rule, so the reference to uah007 would be helpful.
Sometimes aquarium heaters have a tendency to fail when the temperature is reached, hence the relay.
Unfortunately, I didn't find exactly this sensor that uah007 pictured. I found this: AC Digital PZEM-004T Multifunction Meter with clamp.
is this comparable?
@TDer: do these kind of sensors use "Serial Helper" in espeasy ?

Each plugin in ESPEasy for a device which needs UART (including Modbus RTU), is using the Serial Helper and thus ESPEasySerial.
This way there is a uniform abstraction to pick whichever serial port you like to use (HW serial/SW serial/I2C-to-UART...)

[noxin]

hi,

small update: im waiting for delivery of the sensorboard.

Regards
noxin

[noxin]

hello,

got one of this boards now delivered

PZEM-004T 10A-100A Wechselstrom 80-260V AC Current Sensor ESP32 STM ESP8266 UART

from ebay.

I found some hints In the "Serial Helper configuration". now for the first thing to do is configuring the hardware/wiring in an appropriate case (220V).
I assume i will have further questions an that state

regards
noxin

[TD-er]

The PZEM-004T does have some isolation between the section which you connect to the ESP and the mains voltage.
However, make sure to keep the wires connected to your ESP out of the way of the mains voltage as those typical 'Dupont wires' you may use are typically not isolated enough to withstand mains voltage.
And please have the mains voltage part isolated in some plastic enclosure so you won't hurt yourself or damage any electronics.