ESP8266 Community Forum

- Sat Jan 16, 2016 5:02 pm #39007 I'm still playing around!

I suddenly (after removing the CH_PD pin from 3.3v) I got the following error:

Code: Select all▒l`Fatal exception (0):
epc1=0x402017ec, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00000000, depc=0x0   0000000

 ets Jan  8 2013,rst cause:1, boot mode:(3,6)

load 0x40100000, len 1396, room 16
tail 4
chksum 0x89
load 0x3ffe8000, len 776, room 4
tail 4
chksum 0xe8
load 0x3ffe8308, len 540, room 4
tail 8
chksum 0xc0
csum 0xc0

2nd boot version : 1.4(b1)
  SPI Speed      : 40MHz
  SPI Mode       : QIO
  SPI Flash Size & Map: 8Mbit(512KB+512KB)
jump to run user1 @ 1000



Any suggestions?

My setup this time: USB->FTDI, External power with common ground. CH_PD High and GPIO-0 on GND.

- Sat Jan 16, 2016 6:19 pm #39013 If nothing is displayed on reset then you may not be detecting it..
I didn't see a level shifter ,, is the usb converter straped for 5V or 3V or can it be strapped..
your Tx from ESP is < 3v , so may be marginal going to Tx on usb...

- Sun Jan 17, 2016 12:02 pm #39060 Hi, thanks for your reply! So, you are saying the signal is to weak.

Now I tried a 5v ftdi with external 3.3v power supply. Both GND's are directly connected.

What kind of setup do you suggest? ...or what kind of level shifter do you suggest (how connected)?

- Sun Jan 17, 2016 3:23 pm #39071 I like the level shifter that spark fun has, it supports 4 signals, although you only need 2 ....Tx,Rx
usb converter side [HV] +5,gnd,Tx,Rx ESP side [LV] +3.3, gnd,Tx,Rx

If you see no garbage or very little garbage when you Reset, then the signal + level is probably
to low.