As simple as dht11 to raspi to relay to valve
- Raspberry Pi 3B+
- DHT11
- Relay module 8 in 1 with optocoupler
- Electronic valve FCD-180B
| Pin name | Assignment | Connection |
|---|---|---|
| Raspberry Pi | ||
| GPIO17 | Digital out to relay | IN 1 |
| GPIO27 | Data read from sensor | Pin 2 |
| +3.3V | Powering sensor | Pin 1 |
| +5V | Powering relay | VCC |
| GND | Common ground | GND, Pin 4 |
| DHT11 | ||
| Pin 1 | Power in | +3.3V |
| Pin 2 | Data out | GPIO27 |
| Pin 4 | Common ground | GND |
| Relay 8 in 1 | ||
| GND | Common ground | GND, Pin 4 |
| IN 1 | Digital in | GPIO17 |
| VCC | Power in | +5V |
| Pull-up resistor 5k Ohm | ||
| End 1 | +3.3V, Pin 1 | |
| End 2 | GPIO27, Pin 2 |
$ python3 spray1.py -d <duration> -i <interval> -l <humidity limit>