[Arduino] [esp8266_micropython] hc-sr04超声波距离传感器数据读取与mqtt上报

mao_jin_dao

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 = "esp0004"
   
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'] = 'ReportDistance'
    
20. 
    
21. led=Pin(2,Pin.OUT)
    
22. led.on()
    
23. 
    
24. # D2
    
25. trig = machine.Pin(4,machine.Pin.OUT)
    
26. # D1
    
27. echo = machine.Pin(5,machine.Pin.IN)
    
28. 
    
29. def distance():
    
30.     trig.value(1)
    
31.     time.sleep_us(10)
    
32.     trig.value(0)
    
33.     while echo.value() == 0:
    
34.         pass
    
35.     while echo.value() == 1:
    
36.         ts = time.ticks_us()
    
37.         while echo.value() == 1:
    
38.             pass
    
39.         te = time.ticks_us()
    
40.         tc = te - ts
    
41.         distance = round((tc*170)/10000, 2)
    
42.     return distance
    
43. 
    
44. def connectionWifi(ssid, password):
    
45.   wlan = network.WLAN(network.STA_IF)
    
46.   wlan.active(True)
    
47.   wlan.connect(ssid, password)
    
48.   while True:
    
49.     if not wlan.isconnected():
    
50.       led.on()
    
51.       time.sleep_ms(1000)
    
52.       led.off()
    
53.       time.sleep_ms(1000)
    
54.     else:
    
55.       print('connected to network')
    
56.       led.on()
    
57.       break
    
58. 
    
59. if __name__=='__main__':
    
60.   print ("start")
    
61.   
    
62.   connectionWifi(wifi_ssid,wifi_password)
    
63.   
    
64.   client = MQTTClient(mqtt_clientid,mqtt_serverip,mqtt_serverport)
    
65.   client.connect()
    
66.   
    
67.   while True:
    
68.     time.sleep(3)
    
69.     message_template['distance'] = str(distance())
    
70.    
    
71.     client.publish(mqtt_publishtopic,json.dumps(message_template))
    
72.    
    
73.     gc.collect()

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