28018 Parallax Inc, 28018 Datasheet - Page 5

• 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

' -------------------------------------------------------------------------
' Subroutines
' -------------------------------------------------------------------------
' connection reset: 9 clock cyles with ShtData high, then start sequence
'
SHT_Connection_Reset:
' generates SHT11 "start" sequence
'
' ShtData
'
' Clock
'
SHT_Start:
' measure temperature
' -- celcius = raw * 0.01 - 40
' -- fahrenheit = raw * 0.018 - 40
'
SHT_Measure_Temp:
Parallax, Inc. • Sensirion SHT11 Sensor Module (#28018) • 07/2003
LOOP
END
SHIFTOUT ShtData, Clock, LSBFirst, [$FFF\9]
INPUT ShtData
LOW Clock
HIGH Clock
LOW ShtData
LOW Clock
HIGH Clock
INPUT ShtData
LOW Clock
RETURN
GOSUB SHT_Start
ioByte = ShtTemp
GOSUB SHT_Write_Byte
GOSUB SHT_Wait
ackBit = Ack
GOSUB SHT_Read_Byte
soT.HighByte = ioByte
ackBit = NoAck
GOSUB SHT_Read_Byte
PAUSE 1000
"rhLin.... ", DEC (rhLin / 10), ".", DEC1 rhLin, "% ", CR,
"rhTrue... ", DEC (rhTrue / 10), ".", DEC1 rhTrue, "% "
_____
___|
___
|_______|
|___|
___
_____
|___
' let pull-up take high
' alert device
' temperature command
' send command
' wait for measurement
' another read follows
' get MSB
' last read
' get LSB
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