Create Smoothing.py

Author: Hatem-Zehir

03.Analog/Smoothing.py

@@ -0,0 +1,50 @@
+"""
+    Smoothing
+
+    Reads repeatedly from an analog input, calculating a running average and
+    printing it to the computer. Keeps ten readings in an array and continually
+    averages them.
+
+    The circuit:
+    - analog sensor (potentiometer will do) attached to GPIO34
+"""
+from machine import Pin, ADC
+from time import sleep
+
+# Define the number of samples to keep track of. The higher the number, the
+# more the readings will be smoothed, but the slower the output will respond to
+# the input. Using a constant rather than a normal variable lets us use this
+# value to determine the size of the readings array.
+numReadings = 10
+
+
+readings = [0] * numReadings         # the readings from the analog input
+readIndex = 0                        # the index of the current reading
+total = 0                            # the running total
+average = 0                          # the average
+
+pot = ADC(Pin(34))
+pot.atten(ADC.ATTN_11DB)
+
+print(readings)
+
+while True:
+    #subtract the last reading:
+    total = total - readings[readIndex]
+    #read from the sensor:
+    readings[readIndex] = pot.read()
+    #add the reading to the total:
+    total = total + readings[readIndex]
+    #advance to the next position in the array:
+    readIndex = readIndex + 1
+
+    #if we're at the end of the array...
+    if (readIndex >= numReadings):
+        #wrap around to the beginning:
+        readIndex = 0
+
+    #calculate the average:
+    average = total / numReadings
+    #send it to the computer as ASCII digits
+    print(average)
+    sleep(0.1)        # delay in between reads for stability