Freenove Ultimate Starter Kit User Manual

235
Chapter 21 Hygrothermograph DHT11
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The following is the program code:
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im port RPi. GPIO as GPIO
im port time
im port Freenove_DHT as DHT
DHTPin = 11 #define the pin of DHT11
def loop():
dht = DHT.DHT(DHTPin) #create a DHT class object
sumCnt = 0 #number of reading times
w hile(True):
sumCnt += 1 #counting number of reading times
chk = dht. readDHT11() #read DHT11 and get a return value. Then determine
whether data read is normal according to the return value.
print ("The sumCnt is : %d, \t chk : %d"%(sumCnt,chk))
if (chk is dht. DHTLIB_OK): #read DHT11 and get a return value. Then
determine whether data read is normal according to the return value.
print("DHT11,OK!")
elif(chk is dht. DHTLIB_ERROR_CHECKSUM): #data check has errors
print("DHTLIB_ERROR_CHECKSUM!!")
elif(chk is dht. DHTLIB_ERROR_TIMEOUT): #reading DHT times out
print("DHTLIB_ERROR_TIMEOUT!")
else: #other errors
print("Other error!")
print("Humidity : %.2f, \t Temperature : %.2f \n"%(dht.humidity,dht.temperature))
time.sleep(2)
if __name__ == '__main__':
p rint ('Program is starting ... ')
try:
loop()

Freenove Ultimate Starter Kit Specifications

General

Brand	Freenove
Model	Ultimate Starter Kit
Category	Single board computers
Language	English