Add second sensor instructions and ToDo list

README.md

@@ -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:
 
+**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"
 
 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)
     # create the chip select
     cs = digitalio.DigitalInOut(board.D5)
+    #cs_2 = digitalio.DigitalInOut(board.D5)
     # create the mcp object
     mcp = MCP.MCP3008(spi, cs)
+    # mcp_2 = MCP.MCP3008(spi, cs_2)
     # create an analog input channel on pin 5
     analog_ic = AnalogIn(mcp, MCP.P5)
+    # analog_ic_2 = AnalogIn(mcp_2, MCP.P6) 
     try:
         while True:
             print(f"ADC Voltage value: {analog_ic.voltage:.3f}")
@@ -132,3 +140,9 @@ def test_relay_on_off(rly=None):
     except KeyboardInterrupt:
         gp.cleanup()
 ```
+
+## To-Do
+
+[] Integrate Telegram bot to allow `water-on-demand`
+
+[] Monitor moisture levels in Grafana