Difference between revisions of "ESP8266 / ESP8285"

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Line 1: Line 1:
−
[[File:ESP8266-Pinout.jpeg|left|thumb]]
+
[[File:ESP8266-Pinout.jpeg|left|thumb|link=Special:FilePath/ESP8266-Pinout.jpeg]]
−
[[File:ESP8266-Basic-circuit.png|center|thumb]]
+
[[File:ESP8266-Basic-circuit.png|center|thumb|link=Special:FilePath/ESP8266-Basic-circuit.png]]
 
<br />
 
<br />
−
[[File:ESP8266-symbol.png|none|thumb]]
+
[[File:ESP8266-symbol.png|none|thumb|link=Special:FilePath/ESP8266-symbol.png]]
 +
 
 +
==Notes==
 +
 
 +
*IO13 & IO16 don't seem usable for I2C... (at least under Tasmota...)
 +
 
 +
===GPIO Pins===
 +
{| class="wikitable"
 +
|+
 +
!GPIO
 +
!RAW
 +
PIN
 +
!Arduino
 +
!Input
 +
!Output
 +
!Boot State
 +
!
 +
!Notes
 +
!01
 +
!01F
 +
!M3
 +
!07
 +
!12
 +
!D1 mini
 +
|-
 +
|ADC0
 +
|6
 +
|A0
 +
|'''Analog Input'''
 +
|(not useable)
 +
|
 +
|
 +
|
 +
|X
 +
|
 +
|X
 +
|
 +
|
 +
|
 +
|-
 +
|0
 +
|15
 +
|D3
 +
|pulled up
 +
|(caution)
 +
|
 +
|HSPI_MISO, I2SI_DATA
 +
|connected to FLASH button, boot fails if pulled LOW
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|-
 +
|1
 +
|26
 +
|TX
 +
|'''TX pin'''
 +
|(caution)
 +
|'''HIGH'''
 +
|UART0_TXD
 +
|debug output at boot, boot fails if pulled LOW
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|-
 +
|2
 +
|14
 +
|D4
 +
|pulled up
 +
|(caution)
 +
|'''HIGH?'''
 +
|UART1_TXD
 +
|boot fails if pulled LOW
 +
|
 +
|
 +
|on-board LED
 +
|
 +
|on-board LED
 +
|on-board LED
 +
|-
 +
|3
 +
|25
 +
|RX
 +
|(caution)
 +
|'''RX pin'''
 +
|'''HIGH'''
 +
|UART0_RXD
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|-
 +
|4
 +
|16
 +
|D2
 +
|no pullup
 +
|
 +
|
 +
|
 +
|often used as <code>SDA</code> (I2C)
 +
|X
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|-
 +
|5
 +
|24
 +
|D1
 +
|
 +
|
 +
|
 +
|IR_R
 +
|often used as <code>SCL</code> (I2C)
 +
|X
 +
|
 +
|X
 +
|
 +
|
 +
|
 +
|-
 +
|6
 +
|21
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|connected to the flash chip
 +
|X
 +
|X
 +
|X
 +
|X
 +
|
 +
|X
 +
|-
 +
|7
 +
|22
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|connected to the flash chip
 +
|X
 +
|X
 +
|X
 +
|X
 +
|
 +
|X
 +
|-
 +
|8
 +
|23
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|connected to the flash chip
 +
|X
 +
|X
 +
|X
 +
|X
 +
|
 +
|X
 +
|-
 +
|9
 +
|18
 +
|SD2
 +
|
 +
|
 +
|'''HIGH'''
 +
|
 +
|connected to the flash chip
 +
|X
 +
|X
 +
|X
 +
|X
 +
|
 +
|X
 +
|-
 +
|10
 +
|19
 +
|SD3
 +
|
 +
|
 +
|'''HIGH'''
 +
|
 +
|connected to the flash chip
 +
|X
 +
|X
 +
|X
 +
|X
 +
|
 +
|X
 +
|-
 +
|11
 +
|20
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|connected to the flash chip
 +
|X
 +
|X
 +
|X
 +
|X
 +
|
 +
|X
 +
|-
 +
|12
 +
|10
 +
|D6
 +
|
 +
|
 +
|
 +
|HSPI_MISO
 +
|<code>SPI</code> (MISO)
 +
|X
 +
|
 +
|X
 +
|
 +
|
 +
|
 +
|-
 +
|13
 +
|12
 +
|D7
 +
|no pullup
 +
|
 +
|
 +
|HSPI_MOSI, UART0_CTS
 +
|<code>SPI</code> (MOSI)
 +
|X
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|-
 +
|14
 +
|9
 +
|D5
 +
|
 +
|
 +
|
 +
|HSPI_CLK
 +
|<code>SPI</code> (SCLK)
 +
|X
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|-
 +
|15
 +
|13
 +
|D8
 +
|pulled to GND
 +
|(caution)
 +
|'''LOW'''
 +
|MTDO, HSPICS, UART0_RTS
 +
|<code>SPI</code> (CS)
 +
 
 +
Boot fails if pulled HIGH
 +
|X
 +
|
 +
|X
 +
|
 +
|
 +
|
 +
|-
 +
|16
 +
|8
 +
|D0
 +
|no interrupt
 +
|no PWM or I2C support
 +
|'''HIGH'''
 +
|
 +
|used to wake up from deep sleep
 +
|X
 +
|
 +
|
 +
|
 +
|
 +
|
 +
|}
  
 
==Modules==
 
==Modules==
  
 
*[[ESP-01|ESP-01]]
 
*[[ESP-01|ESP-01]]
 +
*[[ESP-01F]]
 
*[[ESP-M3]]
 
*[[ESP-M3]]
−
**IO13 & IO16 don't seem usable for I2C... (at least under Tasmota...)
 
 
*[[ESP-07|ESP-07]]
 
*[[ESP-07|ESP-07]]
 
*[[ESP-12|ESP-12]]
 
*[[ESP-12|ESP-12]]
−
**[http://www.instructables.com/id/Getting-Started-with-the-ESP8266-ESP-12/ Getting Started with the ESP8266 ESP-12] (looks to apply to ESP-07 also)
 
 
*[[LOLIN D1 mini]]
 
*[[LOLIN D1 mini]]
  
 
===[[IoT - Sonoff|Sonoff]]===
 
===[[IoT - Sonoff|Sonoff]]===
  
−
Most (all?) of these are basically ESP8266 or ESP8265 controlled relays
+
Most (all?) of these are basically ESP8266 or ESP8285 controlled relays
  
 
==Firmware==
 
==Firmware==
Line 80: Line 375:
 
File:UMH3N Internals.png
 
File:UMH3N Internals.png
 
File:ESP01 Programmed without button pressing.jpg
 
File:ESP01 Programmed without button pressing.jpg
−
</gallery><br />
+
</gallery>
 +
 
 +
==Booting The ESP82xx==
 +
{| class="wikitable"
 +
|-
 +
!Mode!!CH_PD (EN)!!RST!!GPIO15!!GPIO0!!GPIO2!!TXD0
 +
|-
 +
|'''Download'''||high||high||low||low||high||high
 +
|-
 +
|'''Run'''||high||high||low||high||high||high
 +
|}
 +
 
 +
==Communicating with the ESP8266==
 +
===Physical Connection===
 +
 
 +
Choose your favourite USB-Serial UART.  (I like the [https://www.banggood.com/CJMCU-340-CH340G-TTL-To-USB-STC-Downloader-Serial-Communication-Module-Pin-All-Leads-p-1149176.html 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.  ([http://cholla.mmto.org/esp8266/weird_baud/ 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)
 +
 
 +
*<code>miniterm.py /dev/ttyUSB0 74880</code>
 +
 
 +
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:
 +
 
 +
*<code>miniterm.py /dev/ttyUSB0 115200</code>
 +
 
 +
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)
 +
 
 +
[[ESP8266 -  interpreting the Debug Information when things go wrong|Notes on interpreting the Debug Information when things go wrong]]
 +
 
 
==Information Links==
 
==Information Links==
  
−
[[File:Esp8266ex datasheet.pdf|thumb|right|200px|ESP8266 Datasheet]] [[File:ESP8266 ESP32.pdf|thumb|right|200px|Kolban’s book on the ESP8266]]
+
[[File:Esp8266ex datasheet.pdf|thumb|right|200px|ESP8266 Datasheet|link=Special:FilePath/Esp8266ex_datasheet.pdf]] [[File:Esp8266 hardware design guidelines en.pdf|thumb|right|200px|Esp8266 Hardware Design Guidelines|link=Special:FilePath/Esp8266_hardware_design_guidelines_en.pdf]] [[File:Esp8266-technical reference en.pdf|thumb|right|200px|ESP8266 Technical Reference|link=Special:FilePath/Esp8266-technical_reference_en.pdf]] [[File:ESP8266 ESP32.pdf|thumb|right|200px|Kolban’s book on the ESP8266|link=Special:FilePath/ESP8266_ESP32.pdf]]
  
 
*<span style="font-size:x-large">'''[https://tttapa.github.io/ESP8266/Chap01%20-%20ESP8266.html A Beginner's Guide to the ESP8266]'''</span>
 
*<span style="font-size:x-large">'''[https://tttapa.github.io/ESP8266/Chap01%20-%20ESP8266.html A Beginner's Guide to the ESP8266]'''</span>
Line 100: Line 499:
 
*[http://neilkolban.com/tech/esp8266/ Kolban’s book on the ESP8266]
 
*[http://neilkolban.com/tech/esp8266/ Kolban’s book on the ESP8266]
 
*[http://henrysbench.capnfatz.com/henrys-bench/arduino-projects-tips-and-more/esp8266ex-pinouts-and-connections/ ESP8266EX Pinouts and Connections]
 
*[http://henrysbench.capnfatz.com/henrys-bench/arduino-projects-tips-and-more/esp8266ex-pinouts-and-connections/ ESP8266EX Pinouts and Connections]
 +
*[https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/ ESP8266 Pinout Reference: Which GPIO pins should you use?]
 +
*[https://rabbithole.wwwdotorg.org/2017/03/28/esp8266-gpio.html ESP8266 GPIO Behaviour at Boot]
  
 
==Usage Links==
 
==Usage Links==
Line 131: Line 532:
  
 
*[http://www.instructables.com/id/Making-Soldering-an-ESP-07-Breakout-Board/ Making & Soldering an ESP-07 Breakout Board]
 
*[http://www.instructables.com/id/Making-Soldering-an-ESP-07-Breakout-Board/ Making & Soldering an ESP-07 Breakout Board]
 +
**Or...  [[IoT_-_ESP-07_Everything!|Even better]] (IMO)
 
*'''''[http://www.esp8266-projects.com/2015/03/mailbag-arrival-new-battery-solution.html New Battery solution for ESP8266 Modules]'''''
 
*'''''[http://www.esp8266-projects.com/2015/03/mailbag-arrival-new-battery-solution.html New Battery solution for ESP8266 Modules]'''''
  
Line 147: Line 549:
 
==Projects==
 
==Projects==
  
 +
*[https://hackaday.io/page/1304-virtual-serial-port-tunnel-to-use-with-esp-link Virtual serial port tunnel (to use with ESP-Link)]
 +
**Possibly useful for connecting serial devices over WiFi
 +
**[https://github.com/jeelabs/esp-link ESP-Link]
 
*[http://www.instructables.com/id/WiFi-Plant-Watering-ESP8266/ WiFi Plant Watering ESP8266]
 
*[http://www.instructables.com/id/WiFi-Plant-Watering-ESP8266/ WiFi Plant Watering ESP8266]
 
*[http://www.instructables.com/id/WIFI-Battery-Monitor-System-ESP8266/ WIFI Battery Monitor System - ESP8266]
 
*[http://www.instructables.com/id/WIFI-Battery-Monitor-System-ESP8266/ WIFI Battery Monitor System - ESP8266]
Line 183: Line 588:
 
*[https://openhomeautomation.net/esp8266-battery/ How to Run Your ESP8266 for Years on a Battery]
 
*[https://openhomeautomation.net/esp8266-battery/ How to Run Your ESP8266 for Years on a Battery]
 
*[https://www.youtube.com/watch?v=TVXaRl90Seg New ESP Mini-Project (Web Config!!!) & Announcement]
 
*[https://www.youtube.com/watch?v=TVXaRl90Seg New ESP Mini-Project (Web Config!!!) & Announcement]
 +
 +
===Some Interesting Observations About Parts On Hand===
 +
 +
{| class="wikitable"
 +
|-
 +
|<br />
 +
|ESP-01
 +
|ESP-M3 (unmarked)
 +
|ESP-M3 (marked)
 +
|ESP-07
 +
|ESP-12
 +
|D1-Mini
 +
|ESP32
 +
|-
 +
! colspan="8" |ESP Chip
 +
|-
 +
!Chip Type
 +
|ESP8266
 +
|ESP8266
 +
|ESP8266
 +
|ESP8266
 +
|ESP8266
 +
|ESP8266
 +
|ESP32
 +
|-
 +
!Chip
 +
|ESP8266EX
 +
|ESP8285
 +
|ESP8285
 +
|ESP8266EX
 +
|ESP8266EX
 +
|ESP8266EX
 +
|ESP32-D0WDQ6 (revision 1)
 +
|-
 +
!Chip ID
 +
|0x00039be7
 +
|0x0072797d
 +
|0x0070c38d
 +
|0x0075ad0d
 +
|0x00237e85
 +
|0x00650f82
 +
|ESP32 has no Chip ID. Reading MAC instead.
 +
|-
 +
!Features
 +
|WiFi
 +
|WiFi, Embedded Flash
 +
|WiFi, Embedded Flash
 +
|WiFi
 +
|WiFi
 +
|WiFi
 +
|WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
 +
|-
 +
!Crystal
 +
|26MHz
 +
|26MHz
 +
|26MHz
 +
|26MHz
 +
|26MHz
 +
|26MHz
 +
|40MHz
 +
|-
 +
!MAC
 +
|4c:11:ae:03:9b:e7
 +
|84:0d:8e:72:79:7d
 +
|c8:2b:96:70:c3:8d
 +
|50:02:91:75:ad:0d
 +
|40:f5:20:23:7e:85
 +
|2c:f4:32:65:0f:82
 +
|cc:50:e3:b5:df:c8
 +
|-
 +
! colspan="8" |Flash Chip
 +
|-
 +
!Manufacturer
 +
|5e
 +
|51
 +
|a1
 +
|d8
 +
|20
 +
|5e
 +
|20
 +
|-
 +
!Device
 +
|4014
 +
|4014
 +
|4015
 +
|4014
 +
|4016
 +
|4016
 +
|4016
 +
|-
 +
!Detected flash size
 +
|1MB
 +
|1MB
 +
|2MB
 +
|1MB
 +
|4MB
 +
|4MB
 +
|4MB
 +
|}

Latest revision as of 23:42, 23 February 2022

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 RAW

PIN

Arduino Input Output Boot State Notes 01 01F M3 07 12 D1 mini
ADC0 6 A0 Analog Input (not useable) X X
0 15 D3 pulled up (caution) HSPI_MISO, I2SI_DATA connected to FLASH button, boot fails if pulled LOW
1 26 TX TX pin (caution) HIGH UART0_TXD debug output at boot, boot fails if pulled LOW
2 14 D4 pulled up (caution) HIGH? UART1_TXD boot fails if pulled LOW on-board LED on-board LED on-board LED
3 25 RX (caution) RX pin HIGH UART0_RXD
4 16 D2 no pullup often used as SDA (I2C) X
5 24 D1 IR_R often used as SCL (I2C) X X
6 21 connected to the flash chip X X X X X
7 22 connected to the flash chip X X X X X
8 23 connected to the flash chip X X X X X
9 18 SD2 HIGH connected to the flash chip X X X X X
10 19 SD3 HIGH connected to the flash chip X X X X X
11 20 connected to the flash chip X X X X X
12 10 D6 HSPI_MISO SPI (MISO) X X
13 12 D7 no pullup HSPI_MOSI, UART0_CTS SPI (MOSI) X
14 9 D5 HSPI_CLK SPI (SCLK) X
15 13 D8 pulled to GND (caution) LOW MTDO, HSPICS, UART0_RTS SPI (CS)

Boot fails if pulled HIGH

X X
16 8 D0 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

Booting The ESP82xx

Mode CH_PD (EN) RST GPIO15 GPIO0 GPIO2 TXD0
Download high high low low high high
Run high high low high high high

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 115200

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
ESP8266 Technical Reference
Kolban’s book on the ESP8266

Usage Links

 

Programming

Hardware

Ethernet

& More


Projects

Random

Bits & Pieces

Some Interesting Observations About Parts On Hand


 ESP-01 ESP-M3 (unmarked) ESP-M3 (marked) ESP-07 ESP-12 D1-Mini ESP32
ESP Chip
Chip Type ESP8266 ESP8266 ESP8266 ESP8266 ESP8266 ESP8266 ESP32
Chip ESP8266EX ESP8285 ESP8285 ESP8266EX ESP8266EX ESP8266EX ESP32-D0WDQ6 (revision 1)
Chip ID 0x00039be7 0x0072797d 0x0070c38d 0x0075ad0d 0x00237e85 0x00650f82 ESP32 has no Chip ID. Reading MAC instead.
Features WiFi WiFi, Embedded Flash WiFi, Embedded Flash WiFi WiFi WiFi WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal 26MHz 26MHz 26MHz 26MHz 26MHz 26MHz 40MHz
MAC 4c:11:ae:03:9b:e7 84:0d:8e:72:79:7d c8:2b:96:70:c3:8d 50:02:91:75:ad:0d 40:f5:20:23:7e:85 2c:f4:32:65:0f:82 cc:50:e3:b5:df:c8
Flash Chip
Manufacturer 5e 51 a1 d8 20 5e 20
Device 4014 4014 4015 4014 4016 4016 4016
Detected flash size 1MB 1MB 2MB 1MB 4MB 4MB 4MB
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