ESP-2

Project: ESP-2
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State	Active
Members	Prodigity, Da Syntax
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Description	Playing around with cheap wifi modules
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synopsis

To make the ESP8266 more accessible to everyone I have created a "programmer" which allows for easy firmware uploading and communication with the module.

Behold, the ESP^2 (esp egg salad programmer).

More info to follow soon..

Revision 1.1

xopr Modified the ESP^2 a bit:

• Added three wires (VCC, GND and GPIO2) for Dallas temperature sensor debugging (wire ends are insulated)
• Added pullup resistor was added so GPIO0 can be used after the device has been booted
• Added resistor to the 5V ESP^2 TX signal (should be two diodes I guess, the resistor divider didn't work)

Using Arduino 1.6.4 to program the ESP8266

Taken from https://github.com/esp8266/arduino

• Install Arduino 1.6.4 from the Arduino website.
• Start Arduino and open Perferences window.
• Enter http://arduino.esp8266.com/package_esp8266com_index.json into Additional Board Manager URLs field. You can add multiple URLs, separating them with commas.
• Open Boards Manager from Tools > Board menu and install ESP8266 platform (and don't forget to select your ESP8266 board from Tools > Board menu after installation).
• For the ESP^2, the device name (under Linux) is /dev/ttyACM3
• Change the programmer from AVRISP mkII to ArduinoISP
• poweroff ESP (either unplug the USB or pull the device from the socket
• set the switch to prog
• poweron the ESP
• You can now upload your sketch

Webserver serving JSON

This sketch provides a webserver-like interface and provides a json file (somewhat compatible with SpaceAPI) There is a version running in the space in a 'hot' zone, and accessible on http://192.168.1.132

You can find the code here

SpaceState

This sketch is a web client and will update the SpaceState

You can find the code here

loading scripts from a webserver

I (Da Syntax) got tired from typing the scripts line for line into the lua console of the nodeMCU firmware. I wrote a little function to load the scripts from a webserver running on my laptop. This way I can just save the script on my laptop and load it to my ESP8266 calling 2 functions ( netload() and dofile("netloaded.lua") )

function netload()
	conn=net.createConnection(net.TCP, 0)
	conn:on("receive", function(conn, payload)
		print(payload)
		file.open("netloaded.lua", "w")
		file.write(payload)
		file.close()
	end)
	conn:connect(8080,"192.168.1.193")
	conn:send("GET /test.lua HTTP/1.1\r\nHost: www.example.com\r\n"        .."Connection: keep-alive\r\nAccept: */*\r\n\r\n")
end

Future plans

• Send mac address of the wifi module in get so the web server can return device specific firmwares
• Put the script between specific tags so there won't be any problems with headers that are added by the web server + gives the possibility to add meta data (e.g. version of script or a signature)
• Create a nice php/mysql webapp to easily manage the scripts per module