ESP8266 Community Forum

- Thu May 04, 2017 4:44 pm #65559 Maybe for others...
On ESP 8266-12:
HC-12 .......ESP
TXD...........GPIO13
RXD...........GPIO15

On NodeMcu:
HC-12.......NodeMcu
TXD...........S1 (GPIO8)
RXD...........D4 (GPIO2)

Note: When flashing, I had to remove the wires from HC-12.

- Wed May 19, 2021 2:20 pm #91422 Hi Guys.
I'm new here and I know this is an old post. I've followed every instruction on how to connect the hc-12 to the nodemcu and still can't get it to work. Could you please give a newbie new tips?

- Wed May 19, 2021 3:34 pm #91423

Today successfully tested connection between Arduino Uno + HC12 and NodeMCU + HC12.

If you use the same code, you have wrong connection on NodeMCU side. For your connecting, you must change pins to 13, 15 in your code.

Check this:
http://www.esp8266.com/viewtopic.php?f=32&t=6602

When you say pins 13 &15 that's D7 and D8 right? If so, it didn't work for me. Any other suggestions?