Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)

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By QuickFix
#76481
liderbug wrote:https://smile.amazon.com/WHDTS-ESP8266-Channel-Transmission-Distance/dp/B071WWMMDD/ref=sr_1_4?ie=UTF8&qid=1529080001&sr=8-4&keywords=esp8266+relay+board

Requires 5V in - has onboard 3.3 reg.

Ah, but that's not an ESP-01 (yeah, there's one placed on the board, but it's not what you told us). ;)

Still you need to be certain that your PSU is able to provide a stable 5V at 500mA for the ESP and an extra 100mA (or so) for the relay.