Question

脚本正在读取DS18B20传感器的温度，并将其打印到终端。 Python忽略了应该将这些数据发送到thingspeak.com的代码部分它没有给出错误代码。

任何人都知道错误是什么？

我的代码：

# Temperature to Thingspeak.com
# python
import httplib, urllib, os, glob, time

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def getpid():
    dataAsString = str(os.getpid())

    fb = open("/home/pi/pidfile.pid","w")
    fb.write(dataAsString)
    fb.close()

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        temp_c = float(temp_string) / 1000.0
        return temp_c

        temperature = read_temp()
        params = urllib.urlencode({'field1': temperature, 'key':'Pon_aquí_tu_key'})
        headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}
        conn = httplib.HTTPConnection("api.thingspeak.com:80")
        conn.request("POST", "/update", params, headers)
        response = conn.getresponse()
        print response.status, response.reason
        data = response.read()
        conn.close()
        tme.sleep(16)

while true:
        getpid()
        dataAsInt = str(read_temp())
        dataAsString = str(dataAsInt)
        print dataAsString
        time.sleep(16)

修改单独运行此代码会将温度发送到一次，然后停止。

# Registrador de temperatura Nergiza.com
# python
import httplib, urllib, os, glob, time

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        temp_c = float(temp_string) / 1000.0
        return temp_c

temperatura = read_temp()
params = urllib.urlencode({'field1': temperatura, 'key':'Pon_aquí_tu_key'})
headers = {"Content-type": "application/x-www-form-urlencoded","Accept":
        "text/plain"}
conn = httplib.HTTPConnection("api.thingspeak.com:80")
conn.request("POST", "/update", params, headers)
response = conn.getresponse()
print response.status, response.reason
data = response.read()
conn.close()

Answer 1

由于您有return语句，因此不会执行其后面的代码。也许你应该在返回之后缩小代码，如下所示：

# Temperature to Thingspeak.com
# python
import httplib, urllib, os, glob, time

os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

def getpid():
    dataAsString = str(os.getpid())

    fb = open("/home/pi/pidfile.pid","w")
    fb.write(dataAsString)
    fb.close()

def read_temp_raw():
    f = open(device_file, 'r')
    lines = f.readlines()
    f.close()
    return lines

def read_temp():
    lines = read_temp_raw()
    while lines[0].strip()[-3:] != 'YES':
        time.sleep(0.2)
        lines = read_temp_raw()
    equals_pos = lines[1].find('t=')
    if equals_pos != -1:
        temp_string = lines[1][equals_pos+2:]
        temp_c = float(temp_string) / 1000.0
        return temp_c

    temperature = read_temp()
    params = urllib.urlencode({'field1': temperature, 'key':'Pon_aquí_tu_key'})
    headers = {"Content-type": "application/x-www-form-urlencoded","Accept": "text/plain"}
    conn = httplib.HTTPConnection("api.thingspeak.com:80")
    conn.request("POST", "/update", params, headers)
    response = conn.getresponse()
    print response.status, response.reason
    data = response.read()
    conn.close()
    tme.sleep(16)

while true:
        getpid()
        dataAsInt = str(read_temp())
        dataAsString = str(dataAsInt)
        print dataAsString
        time.sleep(16)

但是如果read_temp_raw equal_pos == -1不会返回任何内容（它无论如何都不会这样做）。

部分代码被忽略 - 为什么？

1 个答案: