我已将土壤湿度传感器模块和 LDR 连接到 ADS1115 ADC（又连接到我的 R Pi）。我正在使用 Python 2.7。ADC 工作正常，它分别打印来自通道 0 和通道 1 的土壤湿度模块和 LDR 的值。我有以下代码可以使用以下指南将数据从土壤湿度模块发送到 Thingspeak：https ://www.mathworks.com/help/thingspeak/use-raspberry-pi-board-that-runs-python-websockets-发布到频道.html
https://github.com/adafruit/Adafruit_Python_ADS1x15
import time
import sys
from time import sleep
import paho.mqtt.publish as publish
import Adafruit_ADS1x15
#GPIO.setmode(GPIO.BOARD)
#Start of user config
channelID= "377509"
apiKey= "<APIKEY>"
#MQTT Connection Methods
useUnsecuredTCP= True
useUnsecuredWebsockets= False
useSSLWebsockets= False
mqttHost= "mqtt.thingspeak.com"
# You can use any Username.
mqttUsername = "SoilHumidityRpiDemo"
# Your MQTT API Key from Account > My Profile.
mqttAPIKey ="<APIKEY>"
if useUnsecuredWebsockets:
tTransport= "websockets"
tPort= 80
#Create topic string
topic= "channels/" + channelID + "/publish/" + apiKey
# Create an ADS1115 ADC (16-bit) instance.
adc = Adafruit_ADS1x15.ADS1115()
GAIN = 1
print('Reading ADS1x15 values, press Ctrl-C to quit...')
while True:
m = adc.read_adc(0, gain=GAIN)
print('Moisture Level:{0:>6}'.format(m))
time.sleep(1)
tPayload= "field1=%s" % m
try:
publish.single(topic, payload=tPayload, hostname=mqttHost, port=tPort, transport= tTransport,auth={'username':mqttUsername,'password':mqttAPIKey})
except KeyboardInterrupt:
break
except:
print ("There was an error publishing the data")
当我执行它时，出现错误消息“发布数据时出错”。然而，当我运行一个脚本从终端上的 ADC 打印土壤湿度值时（没有通过 MQTT 将数据发送到 Thingspeak 的代码），该脚本运行良好。
问题是，因为tPort和tTransport如果只定义useUnsecuredWebsockets为True
由于useUnsecuredWebsockets设置为False几行之前这将永远不会发生。
您可以更改useUnsecuredWebsockets为True或向 if 语句添加 else 子句以设置默认值。
if useUnsecuredWebsockets:
tTransport= "websockets"
tPort= 80
else:
tTransport = "tcp"
tPort= 1883
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