Add ADC example

adc.py

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+#!/usr/bin/python3
+
+# sudo pip3 install adafruit-circuitpython-ads1x15
+
+import time
+import board
+import busio
+import adafruit_ads1x15.ads1115 as ADS
+from adafruit_ads1x15.analog_in import AnalogIn
+
+resistor = 0.00075
+
+# Create the I2C bus
+i2c = busio.I2C(board.SCL, board.SDA)
+
+# Create the ADC object using the I2C bus
+ads = ADS.ADS1115(i2c)
+
+# Create single-ended input on channel 0
+#chan = AnalogIn(ads, ADS.P0)
+
+# Create differential input between channel 0 and 1
+chan1 = AnalogIn(ads, ADS.P0, ADS.P1)
+#chan2 = AnalogIn(ads, ADS.P2, ADS.P3)
+
+print("{:>5}\t{:>5}".format('raw', 'v', 'current'))
+
+while True:
+    print("{:>5}\t{:>5.3f}".format(chan1.value, chan1.voltage, chan1.voltage/resistor))
+    time.sleep(0.5)

gpio_test.py

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+import RPi.GPIO as GPIO
+import time
+
+GPIO.setmode(GPIO.BCM)
+
+GPIO.setup(16, GPIO.OUT)
+GPIO.setup(20, GPIO.OUT)
+GPIO.setup(21, GPIO.OUT)
+GPIO.setup(26, GPIO.OUT)
+time.sleep(2)
+
+GPIO.output(16, GPIO.HIGH)
+print("Pin 16 HIGH")
+time.sleep(2)
+GPIO.output(16, GPIO.LOW)
+print("Pin 16 LOW")
+time.sleep(2)
+
+GPIO.output(20, GPIO.HIGH)
+print("Pin 20 HIGH")
+time.sleep(2)
+GPIO.output(20, GPIO.LOW)
+print("Pin 20 LOW")
+time.sleep(2)
+
+GPIO.output(21, GPIO.HIGH)
+print("Pin 21 HIGH")
+time.sleep(2)
+GPIO.output(21, GPIO.LOW)
+print("Pin 21 LOW")
+time.sleep(2)
+
+GPIO.output(26, GPIO.HIGH)
+print("Pin 26 HIGH")
+time.sleep(2)
+GPIO.output(26, GPIO.LOW)
+print("Pin 26 LOW")
+time.sleep(2)
+
+GPIO.cleanup()