Convert a manual four-way switched fan to remote WiFi control using a four channel relay.
- A fan (or other device) with a four position switch: off, low, medium, high.
- ESP8266 NodeMCU CP2102 ESP-12E Development Board
- 4 Channel 5V Relay Module
- 120V AC to DC 5V 2A/10W Power Supply
- Wire, Solder, Heatshrink, & Tools
- Optional: Dustproof Weatherproof IP65 Electrical Box - Project Enclosure
- Setup PlatformIO
- Copy the
src/credentials.h.examplefile tosrc/credentials.h. - Add the WiFi SSID and password to
src/credentials.h. - Test the network connection and confirm the web form appears on port 80.
- Now "just" assemble the hardware and install fit in your fan. YMMV depending on device. In this case, the fan has been wired so the manual control works as a failsafe when the power relay is unpowered. See example wiring below.
- Done? Now control your fan with:
- The HTML form
- OpenHAB HTTP binding
- Home Assitant RESTful Command integration
- Android - HTTP Request Shortcuts
Create in-app shortcuts GET requests to the following URLS:
http://device-ip-address/?speed=offhttp://device-ip-address/?speed=lowhttp://device-ip-address/?speed=mediumhttp://device-ip-address/?speed=high
Enables creation of a Homescreen folder of fan control shortcuts:
Note: Linux, Windows, MacOS, and iOS can use Zeroconf/Bonjour/mDNS .local
domains, only Android cannot 🙄
MermaidJS Source
graph TB
subgraph 120V[120 Volt AC]
+120[+120VAC]
-120[-120VAC]
end
subgraph S[4 Way Switch]
S-IN[IN]
S-OUT1[OUT 1]
S-OUT2[OUT 2]
S-OUT3[OUT 3]
end
subgraph M[3 Speed Fan Motor]
M-GND[GND]
M-LOW[Low]
M-MED[Medium]
M-HIGH[High]
end
-120-->M-GND
+120-->S-IN
S-OUT1-->M-HIGH
S-OUT2-->M-MED
S-OUT3-->M-LOW
MermaidJS Source
graph TB
subgraph 120V[120 Volt AC]
+120[+120VAC]
-120[-120VAC]
end
subgraph S[4 Way Switch]
S-IN[IN]
S-OUT1[OUT 1]
S-OUT2[OUT 2]
S-OUT3[OUT 3]
end
subgraph M[3 Speed Fan Motor]
M-GND[GND]
M-LOW[Low]
M-MED[Medium]
M-HIGH[High]
end
subgraph T[5V DC Transformer]
T+120[+AC]
T-120[-AC]
T+5[+DC]
T-5[-DC]
end
subgraph ESP[ESP8266]
VIN
GND
subgraph D[Digital Out]
D1
D5
D6
D7
end
end
subgraph R[4 channel 5V relay]
DC+
DC-
subgraph R1[Relay 1]
IN1[In]
NO1[Normally Open]
COM1[Common]
NC1[Normally Closed]
end
subgraph R2[Relay 2]
IN2[In]
NO2[Normally Open]
COM2[Common]
NC2[Normally Closed]
end
subgraph R3[Relay 3]
IN3[In]
NO3[Normally Open]
COM3[Common]
NC3[Normally Closed]
end
subgraph R4[Relay 4]
IN4[In]
NO4[Normally Open]
COM4[Common]
NC4[Normally Closed]
end
end
%% Original Wiring
-120-->M-GND
S-OUT1-->M-HIGH
S-OUT2-->M-MED
S-OUT3-->M-LOW
+120-->T+120
-120-->T-120
+120-->COM1
T+5-->VIN
T-5-->GND
T+5-->DC+
T-5-->DC-
D5-->IN1
D6-->IN2
D7-->IN3
D1-->IN4
%% Stock switch powered when relay is unpowered
NC1-->S-IN
%% Relays 2,3,4 powered by relay 1
NO1-->COM2
NO1-->COM3
NO1-->COM4
NO2-->S-OUT3
NO3-->S-OUT2
NO4-->S-OUT1
I have a HEPA filter in an out-of-the-way, but awkward to access location. Problem, solved.
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