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Add second sensor instructions and ToDo list

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daviddoji 2022-06-27 18:49:24 +02:00
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README.md
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@ -78,6 +78,11 @@ At this point, everytime the relay closes the circuit, apart from the "click" so
Notice that we're using GPIO5 in the board when creating the `cs` object and channel #5 on the MCP chip when creating the `analog_ic` object, respectively: Notice that we're using GPIO5 in the board when creating the `cs` object and channel #5 on the MCP chip when creating the `analog_ic` object, respectively:
**Note**: The MCP3008 allows up to 8 different sensors in its 8 different channels. One only has to create:
- another `digitalio.DigitalInOut` object using the same pin on the raspberry pi (GPIO5 in our case)
- another `MCP.MCP3008` object using the new `DigitalInOut`
- another `AnalogIn` object with the correspondig MCP channel.
```python linenums="1" ```python linenums="1"
import adafruit_mcp3xxx.mcp3008 as MCP import adafruit_mcp3xxx.mcp3008 as MCP
@ -92,10 +97,13 @@ def test_sensor_in_out_water():
spi = busio.SPI(clock=board.SCK, MISO=board.MISO, MOSI=board.MOSI) spi = busio.SPI(clock=board.SCK, MISO=board.MISO, MOSI=board.MOSI)
# create the chip select # create the chip select
cs = digitalio.DigitalInOut(board.D5) cs = digitalio.DigitalInOut(board.D5)
#cs_2 = digitalio.DigitalInOut(board.D5)
# create the mcp object # create the mcp object
mcp = MCP.MCP3008(spi, cs) mcp = MCP.MCP3008(spi, cs)
# mcp_2 = MCP.MCP3008(spi, cs_2)
# create an analog input channel on pin 5 # create an analog input channel on pin 5
analog_ic = AnalogIn(mcp, MCP.P5) analog_ic = AnalogIn(mcp, MCP.P5)
# analog_ic_2 = AnalogIn(mcp_2, MCP.P6)
try: try:
while True: while True:
print(f"ADC Voltage value: {analog_ic.voltage:.3f}") print(f"ADC Voltage value: {analog_ic.voltage:.3f}")
@ -131,4 +139,10 @@ def test_relay_on_off(rly=None):
time.sleep(1) time.sleep(1)
except KeyboardInterrupt: except KeyboardInterrupt:
gp.cleanup() gp.cleanup()
``` ```
## To-Do
[] Integrate Telegram bot to allow `water-on-demand`
[] Monitor moisture levels in Grafana