28018 Parallax Inc, 28018 Datasheet - Page 8
![MODULE SENSOR TEMP+HUMIDITY](/photos/19/50/195082/mfg_28018_sml.jpg)
28018
Manufacturer Part Number
28018
Description
MODULE SENSOR TEMP+HUMIDITY
Manufacturer
Parallax Inc
Series
Sensirion SHT11r
Specifications of 28018
Output Type
Digital - 2-Wire
Sensor Type
Humidity and Temperature
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
28018879
Manufacturer:
st
Quantity:
8 111
Company:
Part Number:
28018883
Manufacturer:
st
Quantity:
3 791
Part Number:
28018883
Manufacturer:
ST
Quantity:
20 000
' reset SHT11/15 with soft reset
'
SHT_Soft_Reset:
In high humidity applications, the SHT11 heater can be switched on briefly to prevent condensation.
Another use of the heater is to test the operation of the sensor: by reading before enabling the heater
and immediately after the sensor can be verified by noting a higher temperature and lower humidity.
The following subroutines can be used to switch the SHT11 heater on and off.
Heater_On:
Heater_Off:
Parallax, Inc. • Sensirion SHT11 Sensor Module (#28018) • 07/2003
8
GOSUB SHT_Connection_Reset
ioByte = ShtReset
ackBit = NoAck
GOSUB SHT_Write_Byte
PAUSE 11
RETURN
status = %00000100
GOSUB SHT_Write_Status
RETURN
status = %00000000
GOSUB SHT_Write_Status
RETURN
' reset the connection
' reset command
' only one byte to send
' send it
' wait at least 11 ms
' heater bit = On
' heater bit = Off