ESP8266 Community Forum

- Thu Oct 22, 2015 8:54 pm #32077 I seriously need some help.... in particular with my first ESP8266-01 module....

I bought it from Sparkfun..... it took me a day JUST to figure out it was set to a baud of 76800 - seriously ? were there not enough baud rates to start with ? I have been in computers and electronics for almost 40 years.... and have never seen 76800.

enuf complaining... here is the odd problem I have. I am using an FT232RL at 3.3v - from what I have read, this might be my problem.... but....

I hook the FT232 up to the ESP - Vcc->Vcc, Gnd->Gnd, Tx->Rx and Rx->Tx.... The ESP lights up red... but nothing else. I bring up a serial terminal and set it accordingly.... type AT in it and get nothing back.......

The odd part.... if I take my finger, and rub across the ESP pins, connecting CH_PD to Vcc, all of the sudden the chip comes alive for a sec. and spits the following out to the serial terminal

Code: Select allets Jan  8 2013,rst cause:1, boot mode:(3,7)

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


I have NO idea what this all means (for the most part) and cannot get the ESP to respond to anything UNLESS I rub my finger across the pins.....

Now, If I take a jumper and hook CH_PD up to Vcc, my pc goes haywire and crashes.

So, I hooked it up to a Teensy 3.1.... tried sending an AT command to it... got nothing back.

My guess is that the ESP wants CSR/DTR.... and I am triggering it by quickly touching CH_PD to Vcc.... just a wild guess though.

HELP ? Please and Thank You.... as my momma taught me.

TJ

- Fri Oct 23, 2015 1:25 am #32089 Just my two cents:

• CH_PD must be HIGH for the device to boot.
• The 3.3v output from your FTDI is probably not powerful enough.

- Fri Oct 23, 2015 3:11 am #32098 Hi, have a quick look at this post - the connections are correct regardless of the methon of flash or communication.
viewtopic.php?f=26&t=6112&p=31958#p31958

- Fri Oct 23, 2015 9:04 am #32118 I would follow the advice of the above users seems like RST or CH_PD might not be high which is a problem.

Besides that make sure to put a filter cap on the power supply, some of the ESPs have a tendency to drop connections from unstable power supplies which cheap USB-UART boards have a problem with.