ESP8266 / ESP8285

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ESP8266-Pinout.jpeg
ESP8266-Basic-circuit.png


ESP8266-symbol.png

Notes

  • IO13 & IO16 don't seem usable for I2C... (at least under Tasmota...)

GPIO Pins

GPIO Input Output Boot State Notes 01 M3 07 12 D1 mini
ADC0 Analog Input (not useable) X X
0 pulled up (caution) connected to FLASH button, boot fails if pulled LOW
1 TX pin (caution) HIGH debug output at boot, boot fails if pulled LOW
2 pulled up (caution) HIGH? boot fails if pulled LOW on-board LED on-board LED on-board LED
3 (caution) RX pin HIGH
4 often used as SDA (I2C) X
5 often used as SCL (I2C) X X
6 connected to the flash chip X X X X
7 connected to the flash chip X X X X
8 connected to the flash chip X X X X
9 HIGH connected to the flash chip X X X X
10 HIGH connected to the flash chip X X X X
11 connected to the flash chip X X X X
12 SPI (MISO) X X
13 SPI (MOSI) X
14 SPI (SCLK) X
15 pulled to GND (caution) LOW SPI (CS)

Boot fails if pulled HIGH

X X
16 no interrupt no PWM or I2C support HIGH used to wake up from deep sleep X

Modules

Sonoff

Most (all?) of these are basically ESP8266 or ESP8285 controlled relays

Firmware

ESP8266 WiFi Connection manager

Original?

ESP8266 AT-Command firmware

Tasmota

Go Here!

Espruino

Home

ESPurna

Home

ESP-MQTT

Home

ESP-go

Home

NodeMcu

Home

ESP Easy

ESPHelper

Home

WLED

  • Home
    • Many bugs seem to appear with version changes...
      • 0.8.6 seems functional on my D1 Minis. (Tho it self-reports as 0.8.4)

Setting up Modules

  • ESP Boot Mode Controller.png
  • UMH3N Internals.png
  • ESP01 Programmed without button pressing.jpg

Communicating with the ESP8266

Physical Connection

Choose your favourite USB-Serial UART. (I like the CJMCU-340)

NOTE: The ESP8266 is a 3.3V device. Don't use a 5V UART!

GPIO1 = TxD

GPIO3 = RxD

As always, Connect TxD to RX-in on your UART & RxD to TX-out on your UART.

Talking to it

NOTE: The ESP initially spits out debug information at 74880 baud. This is not a standard speed. (some discussion about this)

Choose your favourite terminal program & point it at the appropriate port.

In this example, I'll use miniterm (Because it's simple)

  • miniterm.py /dev/ttyUSB0 74880

Gives me this (with an ESP-M3 that's been flashed & made ready for use...): 

--- Miniterm on /dev/ttyUSB0  74880,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---

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

load 0x4010f000, len 3584, room 16 
tail 0
chksum 0xb0
csum 0xb0
v2843a5ac
~ld
␄␝␑␑␁"	��^�K␕���)␄5␑�␌7mX'\��o␇�␄5%�iHD��U␁'Rܥ@␁␒␕␝�␇!␕�␑t␅!o�Y��␓C����+��J[�`�␙��P␂�

See all that weirdness on the last few lines? That's data at a different speed. The device has booted & is trying to talk to us...

Starting over with:

  • miniterm.py /dev/ttyUSB0 74880

Gives me this: 

--- Miniterm on /dev/ttyUSB0  115200,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
rd␀$��|␀�l�|␃␌␌␄�␄l�␄c|��␃�␒�;�cl␄c��g'�log���␌c␜8��lrl;lx�o�␘␃␌␄�␌d␌��␌␄␌#␄g�| 
␃�$�␄�#��no�␀$��l ␃�␛␓og␄l`␃␏␂'{���g␄␌c␃l`␃␇s��n␌␄c␂d`␂�c␌␄�␜␂�l{� ␃��o�␃
00:00:00 CFG: Loaded from flash at F9, Count 89
00:00:00 QPC: Count 2
00:00:00 Project tasmota ESP-M3-Everything-1 Version 8.5.0(tasmota)-2_7_4_1

Oh... Look. It's a Tasmota device.

Notice the weirdness between the banner & the first line with 00:00:00 at the start? That's the debug information coming in at 74880 that we saw in the previous example.

Interpreting the Debug Information

Here's the output from an ESP-07 that hasn't been flashed yet (IOW... Factory fresh): 

--- Miniterm on /dev/ttyUSB0  74880,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---

 ets Jan  8 2013,rst cause:2, boot mode:(3,7)

load 0x40100000, len 27728, room 16 
tail 0
chksum 0x2a
load 0x3ffe8000, len 2124, room 8 
tail 4
chksum 0x07
load 0x3ffe8850, len 9276, room 4 
tail 8
chksum 0xba
csum 0xba
rf[112] : 00
rf[113] : 00
rf[114] : 01

SDK ver: 1.5.4(baaeaebb) compiled @ May 17 2016 19:23:54
phy ver: 972, pp ver: 10.1

)�L�

& the same device booted into flashing mode: 

--- Miniterm on /dev/ttyUSB0  74880,8,N,1 ---
--- Quit: Ctrl+] | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---

 ets Jan  8 2013,rst cause:2, boot mode:(1,7)

Notes on interpreting the Debug Information when things go wrong

Information Links

ESP8266 Datasheet
Esp8266 Hardware Design Guidelines
Kolban’s book on the ESP8266

Usage Links

 

Programming

Hardware

Ethernet

& More


Projects

Random

Bits & Pieces

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