[esp8266_micropython] HC-SR501人体红外传感器数据读取与mqtt上报

mao_jin_dao

综述
供电电压最低为4.5v，请不要使用esp8266 3.3v引脚供电，否则传感器out引脚输出会不稳定。
工作原理请看文档截图。

代码

1. import time
   
2. from machine import Pin
   
3. import network
   
4. from umqtt.simple import MQTTClient
   
5. import json
   
6. import gc
   
7. 
   
8. device_id = "esp0003"
   
9. wifi_ssid='FAST_20CC'
   
10. wifi_password='409409409'
    
11. mqtt_serverip='192.168.1.113'
    
12. mqtt_serverport=1883
    
13. mqtt_clientid=device_id
    
14. mqtt_publishtopic=b'espiot'
    
15. 
    
16. message_template = {}
    
17. message_template['source_device'] = mqtt_clientid
    
18. message_template['target_device'] = 'server'
    
19. message_template['msg_type'] = 'ReportHumanExists'
    
20. 
    
21. # gpio-D1
    
22. human=Pin(5,Pin.IN,Pin.PULL_UP)
    
23. 
    
24. 
    
25. def connectionWifi(ssid, password):
    
26.   wlan = network.WLAN(network.STA_IF)
    
27.   wlan.active(True)
    
28.   wlan.connect(ssid, password)
    
29.   while True:
    
30.     if not wlan.isconnected():
    
31.             print ("connecting...")
    
32.     else:
    
33.       print('connected to network')
    
34.       break
    
35.     time.sleep(1)
    
36. 
    
37. if __name__=='__main__':
    
38.   print ("start")
    
39.   
    
40.   connectionWifi(wifi_ssid,wifi_password)
    
41.   
    
42.   client = MQTTClient(mqtt_clientid,mqtt_serverip,mqtt_serverport)
    
43.   client.connect()
    
44.   
    
45.   while True:
    
46.     time.sleep(3)
    
47.     try:
    
48.       humExists = human.value()
    
49.       print (humExists)
    
50.       message_template['humanExists'] = str(humExists)
    
51.     except:
    
52.       None
    
53.    
    
54.     client.publish(mqtt_publishtopic,json.dumps(message_template))
    
55.    
    
56.     gc.collect()
    

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截图