Using GPIO Switch and HiLetGo Relay board: Relay LED turns on Power does not flow

homeadv · August 31, 2023, 5:16am

I have an Olimex ESP32 POE ISO, a HiLetGo 24V DC Relay Board.
Olimex is getting 48V POE and shows up on the network just great.
I’m powering the HiLetGo from the Olimex 3.3V and GND.

I’m supplying 24V to COM.
When I connect my load to NC, it powers ON, but I cannot turn it off.
When I connect my load to NO, it is OFF, and I cannot turn it off.
In both cases, the LED indicator alongside the Relay turns on so the signal is being sent and received.

My board and my switch in ESPHOME yaml look like this:

esp32:
  board: esp32-poe-iso
  framework:
    type: esp-idf

switch
  - platform: gpio
    pin: GPIO16
    name: "GPIO 16 - Relay 8"
    restore_mode: RESTORE_DEFAULT_OFF

Supporting Links

I have the 24V version of this: 12V 8 Channel Relay Module With Optocoupler High And Low Level Trigger,Shenzhen HiLetgo Technology Co., Ltd
Olimex POE ISO: ESP32-POE-ISO - Open Source Hardware Board (olimex.com)

Thanks for the help

homeadv · August 31, 2023, 5:28am

Uh Oh, I think I just sorted this out.

The relays are Songle SRD-24VDC-SL-C and while they are also rated to control 10Amp at 28VDC, 30VDC, 125VAC, 250VAC that 24VDC in the part numbers means the relays needs 24V to activate.

OK, ordered a different board.