ESP-2

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Project: ESP-2
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State	Active
Members	Prodigity, Da Syntax, xopr
GitHub	No GitHub project defined. Add your project here.
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).

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

SpaceAPI

The new SpaceAPI is a combination of some PHP, MySQL, and some ESP modules updating the space state and sensor data. The ESP sketch sketch will have several features like space state switch, indicator, Dallas temperature and other sensors, which can be enabled compile-time.

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