ESP8266 and Relays - Unsolved Mystery
Collin emailed me with a mystery,. He found some video tutorials that showed people using a relay module with ESP8266 boards but those videos demonstrated a problem with the pins used to connect the the module control pins. The relay appeared to flicker on and off when the ESP turned on, these relay use a LOW 'signal' to operate the relay. Essentially the pin must sink the current through the opto-coupler. Now I must admit, I haven't solved the reason for the examples behaving that way but he asked me to come up with a solution to mitigate the problem, hopefully I have done that.
Videos demonstrating the effect:
• Arduino NodeMCU ESP8266 controlled by...
And
• controlling 8 channel relay by Alexa...
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