Instructions for flashing ESPxxxx boards

This is what I found to reflash on OSX...

(...assuming you have python installed...)
install the esptool
$ pip install esptool 

determine the port where your device is connected. For me this was:
/dev/cu.SLAB_USBtoUART 
To help find:
$ ls -la /dev/*USB*
(if you have been using mongoose-os, it is the same port that you use there)

Then run the esptool to get some basic info on your device. Record this info as it will be helpful when reading through the rest of the docs.

$ esptool.py --port /dev/tty.SLAB_USBtoUART flash_id
>>>
esptool.py v2.3.1
Connecting........_
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
Uploading stub...
Running stub...
Stub running...
Manufacturer: c8
Device: 4016
Detected flash size: 4MB
Hard resetting via RTS pin...
>>>


Get the flash tool from here:
https://github.com/marcelstoer/nodemcu-pyflasher/releases
select the binary for your system


Get the firmware image:
https://nodemcu.readthedocs.io/en/master/en/build/
** be sure to read through the instructions here

I went with the cloud build and used the following modules:
encoder file gpio http i2c mqtt net node ow pwm spi tmr uart websocket wifi

Follow the instructions and if you have done everything correctly, you will get a page with a "Strike!" message.
Wait for the confirm email (took less than 5 minutes) and you will be provided with 2 links, one for an integer build and one for a float build. 
** The integer build has a smaller footprint

Start up the firmware tool, enter in your serial port and select the firmware file. 
Read the info on which flash mode to use and hit the "Flash NodeMCU" button

The firmware process should only take a few minutes.


** some code examples for some common sensors
**http://nodemcu.readthedocs.io/en/master/en/modules/adc/