ESP8266 Community Forum

- Tue Dec 22, 2015 6:20 pm #36989

If I send AT I don't get the "OK" response.

After sending the AT, do you send CR+LF, not only CR ?

- Wed Dec 23, 2015 11:05 am #37012

I went back to attempting communication with a Raspberry Pi and connected it as follows.

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Reset on ESP to GND
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Are you keeping RESET connected to GND constantly?? it will never boot in that case. You reset it by touching to GND temporarily, then let go. It has a pull-up internally that will pull itself back up to ~3.3V.

This was the answer! Thanks everyone for the responses. I connected it to my FTDI cable this morning, did a reset as described and it booted up. It seems to be working properly now at 115200 baud.

- Wed Dec 23, 2015 2:08 pm #37020 Just to follow up a bit more, I observed a few things that might help others out.

First I recommend powering it from an external power source with all power source's grounds tied together.

When I first got it working, I was running power to my breadboard, then powering it from there. I was seeing a lot of resets, and from searching on the internet, it's probably because of a power issue. A couple of capacitors on the breadboard helped, but what finally made it stable was connecting power directly to it rather than going through the breadboard. For any final project that I do, I highly recommend a 0.1uf capacitor as close to the VCC and GND pins as possible.

Also, I have seen various photos on the internet showing the pinout. The photo that gaber shared earlier in this thread looks like the correct one. I would recommend tying CH_PD and RESET pins to 3.3V via a pullup resistor (maybe 10k?) and if you need to do a hardware reset, short the RESET pin to ground briefly.