This is an Esp12-e WiFi MQTT "client" module
intended to add WiFi cotrol to an existing lightswitch (250 watts MAX!),
-and fit inside the existing electrical wall box. (Retrofit).
The circuit uses a 250 watt Songle (125vac@2amp) SPDT Form "C" relay,
everything is powered from 100Vac<240Vac
using a Hi-Link HLK-PM03 3.3Vdc supply.
Step 1: Get the Parts!
You can get a kit of parts from Digi-Key by clicking HERE
The Hi-Link HL03 power supply was purchased on eBay HERE
The Esp12-e was purchased on eBay HERE
You can download the PC board CAD file by clicking HERE
The .pcb file uses ExpressPCB Cad, downloaded by clicking HERE
Step 2: Solder It!
video to follow...
Step 3: Program It!
Here's a generic program to run the WiFi 3Way as an MQTT client-
-download and run in ArduinoIDE. It will create it's own folder (required by Arduino).
Be sure you have the libraries installed and updated-
Select "Generic ESP8266" under tools/board select.
In the ArduinoIDE MQTT3Way script, be sure to set YOUR SSID, Password, and MQTT server IP address.
Properly connect a FT232RL to the WiFi 3-Way device to your computer and ensure all drivers load correctly.
Insure that the proper port adapter appears in device manager and Arduino addresses the COM port that your FT232RL is connected to. Select 115200 baud in the ArduinoIDE menu..
Place a shorting block between GPIO 0 and Gnd. Leave it for initial powerup to set the Esp12-e into FLASH burn mode.
Connect the FTDI cable Gnd to 3-Way (-)
Connect the FTDI TX to the 3-Way (RX)
Connect the FTDI RX to the 3-Way (TX)
Connect the FTDI 3v3 to the 3-Way (+)
-select "Sketch/Upload" on the ArduinoIDE.
AFTER the progress dots(...............) appear, remove the shorting block on GPIO o and ground.
After the progress bar reaches 100%, remove the FT232 and everything. You are set to go!
-Now, add the device to your MQTT dashboard!