ESP8266 Community Forum

I have an ESP-01 and i am attempting to use it with an Arduino UNO. I have Arduino TX going to ESP RX and Arduino RX to ESP TX, Arduino to 3.3V to VCC and CH_PD, ground to ground. in accordance with the attached image. That seems to match what I am seeing everywhere else. The ESP gets very hot when I connect the CH_PD wire and it will never respond to AT commands. Could i have a different pinout?

well, firstly, what kind of esp do you have? i have the esp-03 which i've soldered to a homemade breakout board, and while i've managed to get the boot text through a simple arduino micro sketch, it's only echoing my output back to me. i would add that you should use a pullup resistor to ch_pd if you're not already, and that the arduino's voltage regulator cannot supply enough amperage to power the device. i am powering mine through a 12v 2a dc power brick through a 5v regulator that can handle 1.5 amps, then the output of that to a 3.3 v smd regulator on a homemade breakout board that can handle 1 amp. it sounds to me like you have no response whatsoever from your module, so i would look into an external power supply and regulator, because the esp can use a lot of power from what i've read.

Edit: if your module is giving you a ready but only echoing commands after that just set your terminal to nl&cr

this is the sketch i use to communicate with my esp through my arduino micro. it should work on an arduino mega too, any arduino that has the uart serial and usb serial seperated.