Page 140 - MDP2020-1

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import spidev, time

import RPi.GPIO as GPIO
led = 18

GPIO.setmode(GPIO.BCM)
GPIO.setup(led,GPIO.OUT)

spi = spidev.Spidev()
spi.open(0,0)

spi.max_speed_hz=1350000

def analog_read(channel):
r = spi.xfer2([1, (8+channel) << 4,0])

adc_out = ((r[1]&3)<<8) +r[2]
return adc_out

while True:

reading analog_read(1)
voltage reading * 3.3/1024

print("Reading=%d\tVoltage=%f"%(reading, voltage))

time.sleep(1)
if reading < 100:
GPIO.output(led, GPIO.HIGH)

print("LED ON")

else :
GPIO.output(led, GPIO. LOW)

print("LED OFF")

5. 소스 파일 실행
python mcp3008.py