I'm posting out of desperation trying to decipher the inner workings of a 5V relay module which comes bundled with an ESP-01 that I bought on AliExpess. This relay module is manufactured by LC Technology in China (http://www.chinalctech.com/index.php?_m ... &p_id=1204) They have some high-res photos of the module for the curious.
I tested the ESP-01 in isolation using both the stock AT firmware and NodeMCU and I can confirm it works perfectly fine (writing HIGH and LOW to GPIO0 & GPIO2 work as expected). I also tested the Songle 5VDC component in isolation by giving it a direct 5V feed and it clicks fine. However, when I assemble the ESP-01 on the module and toggle the state of the two GPIO ports, the relay does not click.
What would be a possible way to activate the relay other than toggling the state of the GPIO ports? Any combination (L/L, H/L, L/H, H/H) do not cause the relay to respond. I'm completely stumped and I'm desperate for some clues on how to troubleshoot this darned thing.
I have been unable to get any help from the seller or manufacturer with regards to how to actually control the relay component from the ESP-01 module.