After reading posts like Temperature&humidity sensor (High Accuracy&Mini) v1.0 Bad readings
And much Googling I fixed python script /home/pi/Dexter/GrovePi/Software/Python/grove_i2c_temp_hum_sensor_mini/grove_i2c_temp_hum_mini.py
With this script I get correct temp and hum values! And all working fine.
#!/usr/bin/env python
#
# GrovePi Library for using the Grove - Temperature&Humidity Sensor (http://www.seeedstudio.com/depot/Grove-TemperatureHumidity-Sensor-HighAccuracy-Mini-p-1921.html)
#
# The GrovePi connects the Raspberry Pi and Grove sensors. You can learn more about GrovePi here: http://www.dexterindustries.com/GrovePi
#
# Have a question about this library? Ask on the forums here: http://forum.dexterindustries.com/c/grovepi
#
# Released under the MIT license (http://choosealicense.com/licenses/mit/).
# For more information see https://github.com/DexterInd/GrovePi/blob/master/LICENSE
#################################################################################################################################################
# NOTE:
# The software for this sensor is still in development and might make your GrovePi unuable as long as this sensor is connected with the GrovePi
#################################################################################################################################################
import time,sys
import RPi.GPIO as GPIO
import smbus
debug = 0
# use the bus that matches your raspi version
rev = GPIO.RPI_REVISION
if rev == 2 or rev == 3:
bus = smbus.SMBus(1)
else:
bus = smbus.SMBus(0)
class th02:
ADDRESS = 0x40
TH02_REG_STATUS = 0x00
TH02_REG_DATA_H = 0x01
TH02_REG_DATA_L = 0x02
TH02_REG_CONFIG = 0x03
TH02_REG_ID = 0x11
TH02_STATUS_RDY_MASK = 0x01
TH02_CMD_MEASURE_HUMI = [0x01]
TH02_CMD_MEASURE_TEMP = [0x11]
SUCCESS = 0
def getTemperature(self):
bus.write_i2c_block_data(self.ADDRESS, self.TH02_REG_CONFIG, self.TH02_CMD_MEASURE_TEMP)
for i in range(0,100):
status=self.getStatus()
if debug:
print("st_temp:",status)
if i == 99:
print("can't get response for Temp command for 99 retries:")
exit()
if status:
break
time.sleep(.5)
t_raw_h=bus.read_byte_data(self.ADDRESS, self.TH02_REG_DATA_H)
t_raw_l=bus.read_byte_data(self.ADDRESS, self.TH02_REG_DATA_L)
if debug:
print("raw_temp:",t_raw_h)
print("raw2_temp:",t_raw_l)
temperature = t_raw_h<<8
#print("temp1",temperature)
temperature |= t_raw_l
#print("temp2",temperature)
temperature >>= 2
#print("temp3",temperature)
return (temperature/32.0)-50.0
def getHumidity(self):
bus.write_i2c_block_data(self.ADDRESS, self.TH02_REG_CONFIG, self.TH02_CMD_MEASURE_HUMI)
for i in range(0,100):
status=self.getStatus()
if debug:
print("st:",status)
if i == 99:
print("can't get response for Hum command for 99 retries:")
exit()
if status:
break
time.sleep(.5)
t_raw_h=bus.read_byte_data(self.ADDRESS, self.TH02_REG_DATA_H)
t_raw_l=bus.read_byte_data(self.ADDRESS, self.TH02_REG_DATA_L)
if debug:
print(t_raw)
humidity = t_raw_h<<8
#print("humidity1",humidity)
humidity |= t_raw_l
#print("humidity2",humidity)
humidity >>= 4
#print("humidity3",humidity)
return (humidity/16.0)-24.0
def getStatus(self):
status=bus.read_i2c_block_data(self.ADDRESS, self.TH02_REG_STATUS,1)
#if debug:
# print(status)
if status[0] & self.TH02_STATUS_RDY_MASK != 1:
return 1
else:
return 0
if __name__ == "__main__":
t= th02()
while True:
print(t.getTemperature(),t.getHumidity())
time.sleep(2)
