README
General
===
GPIO.BCM means you're looking at GPIO pins' GPIO numbers ... not their "BOARD" number
Starting the flask app
===
export FLASK_APP=flask_app
flask run --host 0.0.0.0
or
nohup flask run --host 0.0.0.0 &
... if you want to start the server in the background
Stopping the flask app
===
ps -ef | grep python
... finds the PID
kill PID
... ends the process, stopping the flask app
Temperature and Humidity Sensor
===
The sensors are called DHT11s
They require a py library called Adafruit_DHT to be read from
The DHT11 has 3 pins:
the + goes to a 5v on the pi
the - goes to a grnd on the pi
the 'out' goes to a gpio pin on the pi
in gpio_inpouttest.py, this is pin 7 (GPIO number 4)
reference:
https://www.thegeekpub.com/236867/using-the-dht11-temperature-sensor-with-the-raspberry-pi/
Moisture Sensor
===
Moisture sensor has 3 wires between pi and "center" piece
VCC goes to 3.3v
GND goes to GND
DO goes to a GPIO pin
in moisturesensor_test.py, this is pin 7 (GPIO number 4)
reference:
https://www.hackster.io/ben-eagan/raspberry-pi-automated-plant-watering-with-website-8af2dc
Relay
===
The relay is just a switch; REMEMBER it doesnt supply any power, it just connects and disconnects the input circuit(s) its connected to
It has minimum 3 wired connected to the rpi:
VCC goes to 5v
GND goes to GND
InX (1-4) goes to some GPIO pin
The Relay has 4 circuits it can control... one for each box
Looking at the relay such that each box's writing is right-side-up:
Connect the TOP 2 "nodes" to the input circuit means the circuit is default ON
Connect the BOTTOM 2 "nodes" to the input circuit means the circuit is default OFF