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ZAP Remote

This is a web controlled remote for the Etekcity Remote Controlled Electrical Outlets

What you'll need

  1. NodeMCU Dev Kit or any ESP8266 board (you'll have to install nodemcu on it though).
  2. A 433MHz transmitter, like this one from SparkFun
  3. A 3.3V power supply
  4. Some wires

How it works

The transmitter in the ZAP remote is based on a HS 2260A-R4 remote control encoder and works in the 433MHz low power device band. LPD433

The remote controls 5 outlets, and has 10 buttons, one ON/OFF pair for each outlet. It transmits an unique code for each button. If you keep the button pressed it sends the same code over and over.

You can find the wireless frame format in the HS2260 datasheet. But all you care now is the following:

  1. the frame is 12-bit long (8-bit address + 4-bit data)
  2. the encoding is base 3, so there's a 0, 1 and F (the documentation calls it float, I don't know why)
  3. there's a synchronization bit that follows each frame.

You can easily determine the address and data values transmitted by each button, if you have a 433MHz receiver and a digital scope. A SRD should do it too. If you don't have any of these, use an arduino (you'll have to write some code, though).

Once you find out the codes sent by your remote, put them in the cmd_strings table.

Upload the files

Now, upload the files on the ESP8266. I use nodemcu-uploader

for file in *lua; do python nodemcu-uploader.py --port /dev/ttyUSB0 --baud 9600 upload $file ; done

Wiring

Wiring is really simple:

NodeMCU -- RF Transmitter
3V3 -- VCC
GND -- GND
D3 -- DATA

Change your init.lua

I intentionally didn't include init.lua in the source files. All you need to do in init.lua is:

dofile('server.lua')

That's it

Now power it up, look in the DHCP logs and see what IP address it got, then open it in a browser. Something like this: http://192.168.1.125/