- Sonoff SV Board
- DS1820B Sensor - Waterproof type with stainless steel end.
- 6 Pin waterproof / watertight locking connector
The Sonoff SV is flashed with Tasmota to allow reading the DS1820B and controlling the relay
| Tasmota Command | Description |
|---|---|
hostname fancontrol |
set hostname to fancontrol |
FriendlyName fancontrol |
set hostname to fancontrol |
DeviceName fancontrol |
set hostname to fancontrol |
SetOption3 0 |
disable mqtt cuts down on error messages |
module 3 |
set the module type to a Sonoff SV |
gpio14 4 |
set gpio14 to DS18B20 sensor |
SetOption74 1 |
use internal pullup for single DS18B20 sensor |
mem1 100 |
relay on at 100C |
mem2 95 |
relay off at 95C |
Rule1 ON DS18B20#Temperature>%mem1% DO Power on ENDON ON DS18B20#Temperature<%mem2% DO Power off ENDON |
Rule to set power on/off |
Rule1 5 |
Set rule1 to be one-shot detection |
Rule1 1 |
Enable rule1 to start controlling the relay |
Configure everything at once
backlog hostname fancontrol ; friendlyname fancontrol ; devicename fancontrol ; module 3 ; gpio14 4 ; SetOption3 0 ; SetOption74 1 ; mem1 100 ; mem2 95 ; Rule1 ON DS18B20#Temperature>%mem1% DO Power on ENDON ON DS18B20#Temperature<%mem2% DO Power off ENDON ; rule1 5 ; rule1 1
Changing the on/off temperatures is done by changing the mem1 and mem2 variables
| 6 pin connector | Description |
|---|---|
| Battery + | Sonoff power + |
| Battery - | Sonoff power - |
| DS18B20 Vcc | Sonoff GPIO14 V pin |
| DS18B20 Gnd | Sonoff GPIO14 G pin |
| DS18B20 Data | Sonoff GPIO14 S pin |
| Sonoff SV Output + | Radiator Fan Relay + |
The Sonoff SV is powered from the motorcycle battery. When the relay is activated, the +12v signal is passed through to the Sonoff Relay + output, driving the relay for the radiator fan.