links
- http://www.esp8266.com/
- https://github.com/esp8266/esp8266-wiki/wiki
- http://www.electrodragon.com/w/Wi07c
- https://nurdspace.nl/ESP8266
- Documentation, tools, firmwares https://onedrive.live.com/?cid=C4DDF72E6EEA3826&id=C4DDF72E6EEA3826%21631
- https://github.com/esp8266/arduino
- https://github.com/igrr/esptool-ck (with reset support)
- all IO is 3.3V (3.6V max)
- CH_PD i chip-enable and has to be connected to VCC (3.3V)
- RST, GPIO0, GPIO2 should be pulled up to VCC for normal operation (GPIO0 at minumum!)
- GPIO0 pull to ground for firmware update
- make sure that 3.3V VCC power supply can support 300-400mA or there WILL be problems!
serial port
baud rate 115200
AT+GMR 00160901 OK AT+RST OK ets Jan 8 2013,rst cause:4, boot mode:(3,7) wdt reset load 0x40100000, len 24444, room 16 tail 12 chksum 0xe0 ho 0 tail 12 room 4 load 0x3ffe8000, len 3168, room 12 tail 4 chksum 0x93 load 0x3ffe8c60, len 4956, room 4 tail 8 chksum 0xbd csum 0xbd ready
ESP-201
from http://smarpl.com/content/esp8266-esp-201-module-first-impressions
One quirk with the ESP-201 is that is IO15 has to be grounded for the device to function. To flash the device IO00 has to be grounded.
AT+RST OK ets Jan 8 2013,rst cause:4, boot mode:(3,7) wdt reset load 0x40100000, len 212, room 16 tail 4 chksum 0x5e load 0x3ffe8000, len 788, room 4 tail 0 chksum 0x1c load 0x3ffe8314, len 72, room 8 tail 0 chksum 0x55 csum 0x55 jump to user1
modify flash for dio instead of qio: http://smarpl.com/content/esp8266-esp-201-module-freeing-gpio9-and-gpio10
nodemcu
- https://github.com/nodemcu/nodemcu-firmware
- https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en
esptool.py
dpavlin@x200:/rest/cvs/esptool$ git remote -v origin https://github.com/themadinventor/esptool (fetch) origin https://github.com/themadinventor/esptool (push) dpavlin@x200:/rest/cvs/esptool$ ./esptool.py --port /dev/ttyUSB2 read_mac Connecting... MAC: 18:fe:34:a0:38:72
flash firmware
dpavlin@blue:/opt/Espressif/esptool$ ./esptool.py read_mac Connecting... MAC: 18:fe:34:a0:38:72 dpavlin@blue:/opt/Espressif/esptool$ ./esptool.py --port /dev/ttyUSB0 write_flash 0x00000 ../nodemcu-firmware/pre_build/latest/nodemcu_latest.bin Connecting... Erasing flash... Writing at 0x00010800... (17 %)
Get latest build from https://github.com/nodemcu/nodemcu-firmware/releases
dpavlin@x200:/rest/cvs/esptool$ ./esptool.py --port /dev/ttyUSB2 write_flash 0x00000 ./nodemcu_float_0.9.6-dev_20150406.bin dpavlin@x200:/rest/cvs/esptool$ microcom -p /dev/ttyUSB2 -s 9600 connected to /dev/ttyUSB2 Escape character: Ctrl-\ Type the escape character followed by c to get to the menu or q to quit > node.restart() NodeMCU 0.9.6 build 20150406 powered by Lua 5.1.4 lua: cannot open init.lua >
build from source
For latest features, you might want to rebuild software from github source
dpavlin@x200:/rest/cvs$ git clone https://github.com/pfalcon/esp-open-sdk.git dpavlin@x200:/rest/cvs/esp-open-sdk$ export PATH=/rest/cvs/esp-open-sdk/xtensa-lx106-elf/bin:$PATH git clone https://github.com/nodemcu/nodemcu-firmware.git cd nodemcu-firmware dpavlin@x200:/rest/cvs/nodemcu-firmware$ git checkout -b dev origin/dev Branch dev set up to track remote branch dev from origin. Switched to a new branch 'dev' make # check that device is in boot loader mode dpavlin@x200:/rest/cvs/nodemcu-firmware$ ../esptool/esptool.py --port /dev/ttyUSB1 read_mac Connecting... MAC: 18:fe:34:99:f2:83 # flash new firmware dpavlin@x200:/rest/cvs/nodemcu-firmware$ make flash ESPPORT=/dev/ttyUSB1 make -C ./app flash make[1]: Entering directory '/rest/cvs/nodemcu-firmware/app' ../tools/esptool.py --port /dev/ttyUSB1 write_flash 0x00000 ../bin/0x00000.bin 0x10000 ../bin/0x10000.bin Connecting... Erasing flash... Writing at 0x0000c500... (100 %) Erasing flash... Writing at 0x00068c00... (100 %) Leaving... make[1]: Leaving directory '/rest/cvs/nodemcu-firmware/app'
A library for the Microchip MCP3021 A/D converter for use with the ESP8266.
https://github.com/AllAboutEE/ESP8266-MCP3021-Library
nodemcu-uploader
dpavlin@x200:/rest/cvs$ git clone https://github.com/kmpm/nodemcu-uploader dpavlin@x200:/rest/cvs/nodemcu-uploader$ ./nodemcu-uploader.py --port /dev/ttyUSB2 --baud 9600 file list Listing files for key,value in pairs(file.list()) do print(key,value) end >
OpenOCD JTAG
https://github.com/projectgus/openocd
http://www.esp8266.com/viewtopic.php?f=9&t=1871#p11157
| JTAG Signal | ESP8266 GPIO Pin | JTAG Pin (standard 20 pin connector) |
| TMS | 14 | 7 |
| TDI | 12 | 5 |
| TCK | 13 | 9 |
| TDO | 15 | 13 |
| RST | RST | 15 |
verified on https://visualgdb.com/tutorials/esp8266/nodemcu/jtag/
ESP8266 as wireless JTAG Programmer
https://github.com/emard/wifi_jtag
WIFI
software serial
- C library https://github.com/plieningerweb/esp8266-software-uart
- Arduino https://github.com/plerup/espsoftwareserial
Sonoff
https://www.itead.cc/sonoff-wifi-wireless-switch.html
http://wiki.iteadstudio.com/Sonoff
https://github.com/arendst/Sonoff-MQTT-OTA
pinout
My sonoff is early model, with just 4 pins (instead of 5)
1 - VCC
2 - RX
3 - TX
4 - GND
Programming
use dio not qio to fix checksum errors
CH340 USB to ESP8266 ESP-01 Wifi Module Adapter
It doesn't have GPIO0 connected to ground, so flashing doesn't work!
http://www.esp8266.com/wiki/doku.php?id=all-in-one-esp-usb-converter
ESP-01S DHT11 board
#define DHTTYPE DHT11 #define DHTPIN 2 DHT dht(DHTPIN, DHTTYPE, 11);
adding IR led
Button is connected to RST, and if you want to add IR led (with transistor and resistor) it seems that only
way to make it work is to connect it to RX pin (gpio3). For more info see my blog post: https://blog.rot13.org/2019/08/emulate-ir-remote-for-tv-or-hvac-from-command-line-using-tasmota.html
KEYESTUDIO ESP8266 ESP-12F CH340G WiFi Module Board for Arduino NodeMcu
