Add file Softlight.py

2019-06-27 10:01:28 +08:00
parent 8d31394cae
commit 5a81edf724
1 changed files with 53 additions and 0 deletions
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+#############################################################################
+# Filename    : Softlight.py
+# Description : Potentiometer control LED
+# Author      : freenove
+# modification: 2018/08/02
+########################################################################
+import RPi.GPIO as GPIO
+import smbus
+import time
+
+address = 0x48
+bus=smbus.SMBus(1)
+cmd=0x40
+ledPin = 11
+
+def analogRead(chn):
+	value = bus.read_byte_data(address,cmd+chn)
+	return value
+	
+def analogWrite(value):
+	bus.write_byte_data(address,cmd,value)	
+
+def setup():
+	global p
+	GPIO.setmode(GPIO.BOARD)
+	GPIO.setup(ledPin,GPIO.OUT)
+	GPIO.output(ledPin,GPIO.LOW)
+	
+	p = GPIO.PWM(ledPin,1000)
+	p.start(0)
+	
+def loop():
+	while True:
+		value = analogRead(0)		#read A0 pin 
+		p.ChangeDutyCycle(value*100/255)		#Convert ADC value to duty cycle of PWM 
+		voltage = value / 255.0 * 3.3			#calculate voltage
+		print ('ADC Value : %d, Voltage : %.2f'%(value,voltage))
+		time.sleep(0.01)
+
+def destroy():
+	bus.close()
+	GPIO.cleanup()
+	
+if __name__ == '__main__':
+	print ('Program is starting ... ')
+	setup()
+	try:
+		loop()
+	except KeyboardInterrupt:
+		destroy()
+		
+