ESP8266 Community Forum

- Fri May 05, 2023 11:02 am #96344 Hi!
I'm trying to get a bare ESP-12S module to work on a new board. Here are the connections:
RX/TX on GPIO3/GPIO1. Confirmed correct polarity by reading boot messages on serial.
GPIO15 pulled low via 10k.
RESET pulled high via 10k
ENA --> RTS
GPIO0 --> CTS
GPIO12 --> High via 10k
3.3V powered, GND grounded.
GPIO13 connected to input of WS2812 chain.
All other pins floating.

Any obvious blunders? Here's the boot message:
⸮
ets Jan 8 2013,rst cause:2, boot mode:(3,0)

load 0x40100000, len 1856, room 16
tail 0
chksum 0x63
load 0x3ffe8000, len 776, room 8
tail 0
chksum 0x02
load 0x3ffe8310, len 552, room 8
tail 0
chksum 0x79
csum 0x79

2nd boot version : 1.5
SPI Speed : 40MHz
SPI Mode : DIO
SPI Flash Size & Map: 32Mbit(512KB+512KB)
jump to run user1 @ 1000

rf cal sector: 1017
rf[112] : 00
rf[113] : 00
rf[114] : 01

SDK ver: 1.5.4.1(39cb9a32) compiled @ Jul 1 2016 20:04:35
phy ver: 972, pp ver: 10.1

"h⸮hq⸮ըFJ⸮q⸮⸮h⸮+⸮.u"⸮"@j⸮⸮ ⸮@

- Sun May 07, 2023 5:21 am #96367 The garbage characters in the message may indicate that there is a problem with the serial connection.

Make sure that the baud rate of your serial connection matches the baud rate of the ESP-12S firmware. Also make sure that the chain is properly powered and grounded, and that the data line is connected to the correct pin on the ESP-12S.

- Sun May 07, 2023 6:19 pm #96369 It's likely that the code changes the baud rate after boot - try connecting at 115k. You'll see garbage at the start because of the lower baud rate but then the last stuff might be readable