note:spoony:树莓派从pm25传感器读取数据
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note:spoony:树莓派从pm25传感器读取数据 [2016/12/31 14:59] (当前版本) |
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| + | ====== 树莓派从pm25传感器读取数据 ====== | ||
| + | GP2Y105AU0F 粉尘传感器 | ||
| + | |||
| + | <code> | ||
| + | def pm25(): | ||
| + | ser = serial.Serial('/dev/ttyAMA0', 2400, timeout=0.5) | ||
| + | arr =[] | ||
| + | for num in range(0,30): | ||
| + | |||
| + | getchr = ser.read(10) | ||
| + | hexstr = "%s" % getchr.encode('hex') | ||
| + | #print(hexstr) | ||
| + | a = hexstr.find('aa') | ||
| + | a1= hexstr[a+2:a+4] | ||
| + | a2= hexstr[a+4:a+6] | ||
| + | #print (a1,a2) | ||
| + | a1 = int(a1, 16) | ||
| + | a2 = int(a2, 16) | ||
| + | pm25 = (float(a1) * 256 + float(a2))/1024*5*900 | ||
| + | pm25 = round(pm25,2) | ||
| + | arr+=[pm25] | ||
| + | print(num,pm25) | ||
| + | endTime = time.time() | ||
| + | time.sleep(1) | ||
| + | ser.close() | ||
| + | return round(sum(arr)/len(arr),2) | ||
| + | </code> | ||
note/spoony/树莓派从pm25传感器读取数据.txt · 最后更改: 2016/12/31 14:59 (外部编辑)
