Dobrica Pavlinušić's random unstructured stuff

ESP8266: Revision 20

{toc: }

^ 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)

^ ESP-01 pinout

{image: module_v2.png}

* 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

.pre
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

.pre

^ ESP-201

http://www.banggood.com/ESP8266-ESP-201-Remote-Serial-Port-WIFI-Transceiver-Wireless-Module-p-964288.html

{image: ESP8266-ESP-201-pin-reference-v01.png}

from http://smarpl.com/content/esp8266-esp-201-module-first-impressions

* http://jas-hacks.blogspot.com/2015/04/iot-esp8266-esp-201-cc1110-xrf.html

> 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.

^ nodemcu

* https://github.com/nodemcu/nodemcu-firmware

.pre
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 %)

.pre