Analog Current Sensor: sct-013-000 on Wemos D1 Mini

[ilsicca]

Board: Wemos D1 Mini ESP8266 ESPEasy version: ESP_Easy_mega_20240822_normal_IRext_no_rx_ESP8266_4M2M.bin (I need the IR Send)

Hi! How are they? I'm try to use a current sensor sct-013-000 on Wemos D1 Mini

When I add the analog input (internal device), I only get a constant reading of 547, approx. When I turn on or off the device that I need to measure the current, the analog reading does not change either. However, when I take the readings without ESPEasy, I can read them correctly. This is the code:

https://github.com/Mottramlabs/MQTT-Power-Sensor/blob/master/Firmware/Version%201/Basic_Current_Sensor/Basic_Current_Sensor.ino

Thanks a lot!

[TD-er]

That code seems to capture 600 analog samples as fast as it can and then take the peak-to-peak value. The analog input plugin in ESPEasy does not take samples that often. I think it only takes upto 10 per second, maybe 50 (have to check the code). Then the highest and lowest measured values are discarded and the average is taken over the rest. So it is actually doing quite the opposite of what you need.

[ilsicca]

thanks @TD-er . Do you know another way to read sct-013-000 with ESPEasy?

[TD-er]

Not at this moment, however it is possible to add an extra mode to the ADC plugin to read in bursts and take the peak-to-peak values as is done in your example code.

There is a pending pull request using such clamps, but it is using some extra electronics as frontend. See: https://github.com/letscontrolit/ESPEasy/pull/4009

You can also look at those PZEM-004Tv30 modules, which also do some pre-processing on measured data from current clamps. This is much more reliable as the ESP isn't equipped to constantly monitor the signal comming from those current clamps at a high enough sample rate.