esp8266

Links Sonoff , MicroPython , mqtt , ds18b20 , RabbitMq
https://learn.adafruit.com/adafruit-huzzah-esp8266-breakout/overview
201512 - https://www.hackster.io/komedia/esp8266-automated-dog-feeder-using-pebble-watch-and-more-d43749?ref=newsletter&utm_source=Hackster.io+newsletter&utm_campaign=bbc5d934a5-2015_4_17_Top_projects4_16_2015&utm_medium=email&utm_term=0_6ff81e3e5b-bbc5d934a5-135098377
Small wifi electronic module ESP-01(WIR04001251) and ESP-03(WIR04001252)
Links Arduino/DS18B20TempSensors
http://www.hobbytronics.co.za/p/930/esp8266-serial-wifi-wireless-transceiver
3D wifi map http://hackaday.com/2015/02/17/mapping-wifi-signals-in-3-dimensions/
github project for ESP https://github.com/cnlohr/esp8266ws2812i2
LUA + programming http://vaasa.hacklab.fi/2015/01/12/esp8266-ds18b20-thingspeak-nodemcu/

2019 connect old esp8266 Huzzah

https://www.adafruit.com/product/2471
Connect to usb using FDDI 3.3v cable (White usb plug)
- Connect to serial /dev/ttyUSB using screen
```
sudo screen /dev/ttyUSB0
```
- When i click the reset button on esp8266 i get the welcome message
```
NodeMCU 0.9.5 build 20150318  powered by Lua 5.1.4
lua: cannot open init.lua
```
- Switch on red led on esp8266 using lua commands
```
gpio.mode(3, gpio.OUTPUT)
gpio.write(3, gpio.LOW)
#Pause red led on
gpio.write(3, gpio.HIGH)
```

Program the HUZZAH ESP8266

For the HUZZAH ESP8266 breakout buttons for GPIO0 and RESET are built in to the board. Hold GPIO0 down, then press and release RESET (while still holding GPIO0), and finally release GPIO0.

$ sudo esptool --port /dev/ttyUSB0 erase_flash

Upload firmware

$ esptool --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 firmware.bin
## Press hold left button, then click reset, upload begins.
esptool.py v2.1
Connecting........_____....._____....._____....._____....._____....._____.....
Detecting chip type... ESP8266
Chip is ESP8266
Enabling default SPI flash mode...
Configuring flash size...
Auto-detected Flash size: 4MB
Erasing flash...
Flash params set to 0x0040
Took 2.55s to erase flash block
Writing at 0x00015800... (14 %)
...
Wrote 615424 bytes at 0x00000000 in 67.2 seconds (73.2 kbit/s)...

Leaving...
Hard resetting...

Setup Arduino for esp8266

Have to download Arduino linux tar file
Un-tar and sudo ./install.sh to install
Add aditional board url "http://arduino.esp8266.com/stable/package_esp8266com_index.json"
Under boards, open board manager and search for esp8266, add
Now select board, NodeMCU 0.9 ESP-12

...