add example

examples/ads1x15_fast_read.py

@@ -0,0 +1,37 @@
+import time
+import board
+import busio
+import adafruit_ads1x15.ads1015 as ADS
+from adafruit_ads1x15.ads1x15 import Mode
+from adafruit_ads1x15.analog_in import AnalogIn
+
+# Data collection setup
+RATE = 3300
+SAMPLES = 1000
+
+# Create the I2C bus with a fast frequency
+i2c = busio.I2C(board.SCL, board.SDA, frequency=1000000)
+
+# Create the ADC object using the I2C bus
+ads = ADS.ADS1015(i2c)
+
+# Create single-ended input on channel 0
+chan0 = AnalogIn(ads, ADS.P0)
+
+# ADC Configuration
+ads.mode = Mode.CONTINUOUS
+ads.data_rate = RATE
+
+data = [None]*SAMPLES
+
+start = time.monotonic()
+
+# Read the same channel over and over
+for i in range(SAMPLES):
+    data[i] = chan0.value
+
+end = time.monotonic()
+total_time = end - start
+
+print("Time of capture: {}s".format(total_time))
+print("Sample rate requested={} actual={}".format(RATE, SAMPLES / total_time))