Got energy monitor working but do not know enough code to get a calculation done

ESPHome
1

Dearest community .
I was following this two guide for an energy monitor.
https://www.makeuseof.com/how-to-build-a-diy-household-energy-monitor-using-esp8266/

and after some tweaking i think i got the values correct on the lovelace card and the log.
Screenshot from 2022-06-05 20-10-21

But i would like it to display WATTS. As you know amps = watts ÷ volts
But i dont know enough code to make it display. I just broke the code too many times already
Any kind soul that could help me or point me in the right direction?
This it the part I am using in ESPHOME

captive_portal:
sensor:
  - platform: ct_clamp
    sensor: adc_sensor
    name: "Measured Current"
    update_interval: 5s        #You may change this value (in seconds)
    id: measured_current       #Measured in ampere (I)
    filters:
    - calibrate_linear:
          - 0 -> 0
          - 0.49 -> 11.82

  # Example source sensor
  - platform: adc
    pin: A0
    id: adc_sensor
    
  - platform: total_daily_energy
    name: "Total Daily Power Usage"
    power_id: my_power

  - platform: template
    id: my_power
    name: "Measured Power"
    lambda: return id(measured_current).state * 125 / 1000; #Power = V*I/1000. So change 230V to whatever your mains voltage is)
    unit_of_measurement: 'kW'
    update_interval: 5s        #You may change this value (in seconds)

time:
  - platform: sntp
    id: my_time

all pointers are greatly appreciated.

2

You want measured Power to be in W, not kW? Just take out the division by 1000 and change the unit of measurement to W.

1 Like
3

damn i totally missed that. That was sad. Must have run out of caffeine.

Abusing of your kindness . I need to make this 2 phase. Could i just copy paste , change the names and use another ADC pin?

4

Yes and No.

The esp8266 only has one ADC. see Analog To Digital Sensor — ESPHome

Solutions:

  1. use an external ADC - there are several mentioned ESPHome — ESPHome ; or

  2. Use an esp32.

5

Thanks i forgot to mention I am using a 38 pin esp32 I was able do double the cirtcuit and code.
Im going to try and put 8 clamps on it. thanks for the pointers.

1 Like