ESP doesn't work plugged to breaboard, but unplugged works

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ESP doesn't work plugged to breaboard, but unplugged works

Postby Atexor » Thu Dec 14, 2017 9:50 pm

I've "little" and very strange problem with my ESP8266 12E on devkit.

I want to measure data from two ADC (MCP3208) and send them via WiFi. I've copied my program which I wrote previously for Arduino (worked). I changed only pinouts and all the time I'm getting errors like this:

Code: Select all

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d

Full errors code:
(there are different stack errors)

I decoded it using ESP Exception Decoder but they don't tell me nothing which could be useful. I updated firmware, changed delays to millis (I though it's caused by watchdog).

Accidentally I found that it's caused by... connecting ESP8266 to empty breadboard. Please take a look at these movies:
1. ESP on breadboard. I've errors and ESP has problem to run. Do not pay attention to smd on the left, it isn't connected and even without it still doesn't work.

2. ESP is floating in the air. I've tested on 2 longs breadboards - my and friends long breadboards on both sides.
Two days ago it looked to work on my small breadboard (1/2 length of long). Now it doesn't work even on that.

What could be reason of that? There are no short circuits.

Also I design PCB with that ESP on Camsoft Eagle. How should I make connections to simulate "ESP in the air"?

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Location: Pune, India

Re: ESP doesn't work plugged to breaboard, but unplugged works

Postby » Tue Jan 02, 2018 8:58 pm

Looks interesting, I think this has something to do with ground loops. Also, use a proper USB source, do not power this via cheap hubs, they cannot supply enough current to the ESP.
And if it is not a breadboard problem, not sure what it could be otherwise. It seems like you get different exception numbers every time. Gotta be the power supply!
- Pratik Panda
Nerd and Embedded Design Consultant

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