ESP8266 Community Forum

- Mon May 18, 2015 12:03 pm #17765 Howdy

I have a strange problem.
In my setup I have ESP-01 flashed with firmware from: https://github.com/tangophi/esp8266_iot_enabler
(This happens with any firmware, not just with that one)

It has DHT-22 sensor connected.

When it boots up properly, everything works. My mqtt-broker receives temperature and humidity readings and ESP receives relay messages as it is supposed to.

I have putty running in Ubuntu-PC connected to ESP via TTL232RG VIP-WE cable.
http://www.ftdichip.com/Support/Documen ... CABLES.pdf

ESP is powered by a good lab power supply.

Problem is: my ESP does not start every time I connect power.
Sometimes, not too often, it starts up right away, prints out debug messages via putty and starts publishing mqtt messages.
Usually it just spews out some gibberish, just few characters, and then freezes.

I have tried reflashing it, I have replaced the ESP-01 with new one. Twice.
I have added capacitor to power lines.
Nothing helps.
I have measured the voltage. Exactly 3.3V.

Current is no problem, unless it needs more than 10A. (Just joking)


Any idea what could be the problem? I am running out of ideas.

- Mon May 18, 2015 5:14 pm #17786 How are you wired?

8 Mhz 28 PIN AVR!!!!!

- Mon May 25, 2015 7:41 am #18391 Howdy again.

It was wires.
ESP was connected to breadboard via 5cm flat cable.
I replaced it with another 5cm flat cable, still same problem.
Tried third one and now everything works!

How come ESP-01 is so sensitive?

I need to build pinheader connector so I can ditch any unneeded cables in my test system, I think.

-MJ-