I recently purchased a bare-bone ESP8266-12E module(http://www.kynix.com/Detail/1324534/ESP8266-12E.html) but am having major issues with stability. Here is a schematic of what I am using.
I am able to program the ESP using Atmel Studio and the Arduino IDE with no issue after putting the chip into program mode by connecting GPIO0 to ground. The problem is the code never executes. I get the message:
ets Jan 8 2013,rst cause:2, boot mode:(3,6) load 0x4010f000, len 1384, room 16 tail 8 chksum 0x2d csum 0x2d v09f0c112 ~ld
Indicating that the chip has entered the proper boot mode and the code should be running, but the chip freezes, doing nothing. Note: Boot mode 1 is programming mode and boot mode 3 is boot from internal flash. I assumed this was me setting up the SDK wrong or using a version with errors so I flashed the latest AT command firmware to see if the problem was in the hardware. The chip gave the same problem. A normal boot message followed by nothing. Occasional, after resetting the chip, I'd receive a stacktrace like this:
Exception (0): epc1=0x4022c0e0 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000 ctx: sys sp: 3ffff850 end: 3fffffb0 offset: 01a0 >>>stack>>> 3ffff9f0: 4022c0e0 00000004 3ffee734 00000001 3ffffa00: 00000001 19161310 24221f1c 2e2c2927 3ffffa10: 00002f49 3ffee6b8 4022dff4 3ffee688 3ffffa20: 3ffee688 00000000 3ffee734 3ffee688 3ffffa30: 3ffee688 3ffee734 3ffee688 00000000 3ffffa40: 3ffee688 60000600 60000200 3ffffa70 3ffffa50: 40229c2b 00000000 3ffee688 00000000 3ffffa60: 40105f02 60000e00 00000008 3fffff10 3ffffa70: 4022eda6 3ffffa80 00000008 4021e332 3ffffa80: 00000000 00000000 00000017 88a020a6 3ffffa90: 00000000 b20017e3 0000712a 3fff0b2c 3ffffaa0: 00000000 40201dcd 3fff0b2c 3fff0b2c 3ffffab0: 3ffee1fe 40233310 00000001 00000000 3ffffac0: 00000001 3fff0b2c 000002f4 003fc000 3ffffad0: 40105666 00000002 3ffee1fe 4021aebb 3ffffae0: 4021b534 60000e00 3fff0b2c 4021b50f 3ffffaf0: 40104eac 000003fd 00000002 60000200 3ffffb00: 3fffff10 c235e4f1 108275c5 7f3da5d8 3ffffb10: ffff02fc ffffffff ffffffff ffffffff 3ffffb20: ffffffff ffffffff ffffffff ffffffff 3ffffb30: ffffffff ffffffff ffffffff ffffffff ...
During this time I am also aware that the chip was throwing off a lot of RF interference as every time this stack was printed, every device connected to wifi within a ~10m radius of the chip was disconnected and could not re-discover any network for around 10 seconds. Is it possible this chip is simply defective? Is there an issue with my power supply? I am providing the 3.3v regulator with a 5v 2A USB power brick. All of the capacitors are electrolytic.
We do not have any experience with the bare bones ESP chip-sets. OpenEVSE uses the Adafruit Huzzah ESP8266 module which is inexpensive and very stable. We are sorry we could not help answer your question.