Small RaspberryPi project to automate the watering of a christmas-tree, by pumping water from a reservoir to the pot of the christmas-tree, when the waterlevel inside the pot is too low. The waterlevel of the reservoir and the christmass-tree are checked regularly. A buzzer is turned on, when either water-level is below the sensors.
To measure the water-level, two cables are fixated in the tank (either the water reservoir, or the pot of the christmas-tree) and connected to the RaspberryPi. By calling check_water_level, the RaspberryPi checks if both cables are in the water.
Calling water_watchdog starts an endless loop:
- Check if Reservoir has enough water.
1.1 if not enough water, beep when it is not night (
check_off_time). Then wait 5 seconds so that water in reservoir is in steady state. - Check if Christmas-Tree-Pot has enough water.
2.1 if not enough water, pump a total of
pump_duration-seconds. - Wait for 20 seconds.
- Repeat from 1.
If after 3 times of consecutive pumping the water-level of the christmas-tree is still not high enough, then turn on an a panic-alarm, regardless of day-/night-time, since there is prob. a leakage somewhere.
GPIO_tree_sensorandGPIO_tree_ref: Two cables used for checking water-level for the pot where the christmas-tree sits in.GPIO_reservoir_sensorandGPIO_reservoir_ref: Two cables used for checking water-level for the water-reservoir.GPIO_alarm: Pin to control buzzer to make beep-sound. If alarm is off, this Pin is set toHIGH.GPIO_pump: Pin to control pump. If pump is off, this Pin is set toLOW.
It is recommended to use an OpAmp circuit in buffer-configuration for the GPIO_reservoir_sensor-Pin and GPIO_tree_sensor-Pin, as the internal resistance of the RaspberryPi can be too small. Furthermore, a Pull-down resisitor (eg. 68kΩ) should be used for the input-pins of the OpAmp.
Sample Circuit:
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|
| Vcc (5V) (OpAmp) |
Vcc (3.3V) (buzzer, relais) |
Sensor 1 | Alarm | Ref 1 | GND | Ref 2 | Sensor 2 | Pump | NA |
Configure the GPIO-pins and put script into autostart of RaspberryPi.
Set up new telegram-bot using @botfather and update TOKEN in main.py.