New lickometer micropython codes

devices/lickometer_2.py

@@ -0,0 +1,22 @@
+from pyControl.hardware import Digital_input, Digital_output
+
+class Lickometer():
+    """
+    Optical lickometer to detect lick events
+    Device documentation on: https://sanworks.io/shop/viewproduct?productID=1020
+    
+    Configuration:
+    Red wire: positive; Purple wire: negative
+    Wires closer to the 4mm nut: emitter; wires further from: transistor
+    
+    # All purple wires --> GND
+    # Transistor positive end --> Digital input port
+    # Emitter positive end --> 500 ohm resistor --> Power source
+    # Add a 40k pull-up resistor between power source and digital input
+    """
+
+    def __init__(self,  lick_port, sol_port, rising_event_A='lick_1', debounce=5, **kwargs):
+        # Event triggered when pin is pulled down
+        self.lick_1 = Digital_input(lick_port.DIO_A, rising_event_A, falling_event=None, debounce=debounce, pull=up)
+        self.SOL_1  = Digital_output(sol_port.POW_A)
+        self.SOL_1.off()