Raspberry Pi取得CPU温度

获取树莓派的CPU和GPU温度

先找准设备名：

import commands
 
def get_cpu_temp():
    tempFile = open( "/sys/class/thermal/thermal_zone0/temp" )
    cpu_temp = tempFile.read()
    tempFile.close()
    return float(cpu_temp)/1000
    # Uncomment the next line if you want the temp in Fahrenheit
    #return float(1.8*cpu_temp)+32
 
def get_gpu_temp():
    gpu_temp = commands.getoutput( '/opt/vc/bin/vcgencmd measure_temp' ).replace( 'temp=', '' ).replace( '\'C', '' )
    return  float(gpu_temp)
    # Uncomment the next line if you want the temp in Fahrenheit
    # return float(1.8* gpu_temp)+32
 
def main():
    print "CPU temp: ", str(get_cpu_temp())
    print "GPU temp: ", str(get_gpu_temp())
 
if __name__ == '__main__':
    main()

这里面有两个方法：get_cpu_temp和get_gpu_temp。它们俩都返回一个float型的 摄氏温度值。(如果你想使用华氏温度，打开里面的两行注释)。现在，让我们把所有信息 输出到树莓派LCD屏上吧。

原作者已经把完整的Python程序上传到了dropbox上： https://www.dropbox.com/s/e04v8vnus1hwrm0/rpy_cpu_gpu_temp.py

全部代码：

# Rollcode.com 
import commands
import os  
import RPi.GPIO as GPIO 
import time 
  
LCD_RS = 25
LCD_E  = 24
LCD_D4 = 23 
LCD_D5 = 17
LCD_D6 = 18
LCD_D7 = 22
  
LCD_WIDTH = 16 
LCD_CHR = True
LCD_CMD = False
  
LCD_LINE_1 = 0x80
LCD_LINE_2 = 0xC0 
  
E_PULSE = 0.00005
E_DELAY = 0.00005

def get_cpu_temp():
    tempFile = open( "/sys/class/thermal/thermal_zone0/temp" )
    cpu_temp = tempFile.read()
    tempFile.close()
    return float(cpu_temp)/1000
    # Uncomment the next line if you want the temp in Fahrenheit
    #return (1.8*cpu_temp)+32

def get_gpu_temp():
    gpu_temp = commands.getoutput( '/opt/vc/bin/vcgencmd measure_temp' ).replace( 'temp=', '' ).replace( '\'C', '' )
    return  float(gpu_temp)
    # Uncomment the next line if you want the temp in Fahrenheit
    # return (1.8* gpu_temp)+32

def main():  
     
    GPIO.setmode(GPIO.BCM)         
    GPIO.setup(LCD_E, GPIO.OUT)    
    GPIO.setup(LCD_RS, GPIO.OUT)   
    GPIO.setup(LCD_D4, GPIO.OUT)   
    GPIO.setup(LCD_D5, GPIO.OUT)   
    GPIO.setup(LCD_D6, GPIO.OUT)   
    GPIO.setup(LCD_D7, GPIO.OUT)   
     
    lcd_init()  
     
    # Here we show the message on the LCD screen  
  
    str_cpu = str(round(get_cpu_temp(), 2))
    str_gpu = str(get_gpu_temp())
	
    lcd_byte(LCD_LINE_1, LCD_CMD)  
    lcd_string("CPU: " + str_cpu + " C",1)  
    lcd_byte(LCD_LINE_2, LCD_CMD)  
    lcd_string("GPU: " + str_gpu + " C",1)  
     
def lcd_init():  
    lcd_byte(0x33,LCD_CMD)  
    lcd_byte(0x32,LCD_CMD)  
    lcd_byte(0x28,LCD_CMD)  
    lcd_byte(0x0C,LCD_CMD)    
    lcd_byte(0x06,LCD_CMD)  
    lcd_byte(0x01,LCD_CMD)    
     
def lcd_string(message,style):  
    # Send string to display  
    # style=1 Left justified  
    # style=2 Centered  
    # style=3 Right justified  
     
    if style==1:  
        message = message.ljust(LCD_WIDTH," ")    
    elif style==2:  
        message = message.center(LCD_WIDTH," ")  
    elif style==3:  
        message = message.rjust(LCD_WIDTH," ")  
       
    for i in range(LCD_WIDTH):  
        lcd_byte(ord(message[i]),LCD_CHR)  
     
def lcd_byte(bits, mode):  
    GPIO.output(LCD_RS, mode)   
       
    GPIO.output(LCD_D4, False)  
    GPIO.output(LCD_D5, False)  
    GPIO.output(LCD_D6, False)  
    GPIO.output(LCD_D7, False)  
    if bits&0x10==0x10:  
        GPIO.output(LCD_D4, True)  
    if bits&0x20==0x20:  
        GPIO.output(LCD_D5, True)  
    if bits&0x40==0x40:  
        GPIO.output(LCD_D6, True)  
    if bits&0x80==0x80:  
        GPIO.output(LCD_D7, True)  
       
    time.sleep(E_DELAY)      
    GPIO.output(LCD_E, True)    
    time.sleep(E_PULSE)  
    GPIO.output(LCD_E, False)    
    time.sleep(E_DELAY)        
       
    GPIO.output(LCD_D4, False)  
    GPIO.output(LCD_D5, False)  
    GPIO.output(LCD_D6, False)  
    GPIO.output(LCD_D7, False)  
    if bits&0x01==0x01:  
        GPIO.output(LCD_D4, True)  
    if bits&0x02==0x02:  
        GPIO.output(LCD_D5, True)  
    if bits&0x04==0x04:  
        GPIO.output(LCD_D6, True)  
    if bits&0x08==0x08:  
        GPIO.output(LCD_D7, True)  
       
    time.sleep(E_DELAY)      
    GPIO.output(LCD_E, True)    
    time.sleep(E_PULSE)  
    GPIO.output(LCD_E, False)    
    time.sleep(E_DELAY)  
  
if __name__ == "__main__": 
    main()