I have started to put together a 'library' to read I2C sensors with a Campbell Cr1000X. My thought was that we could collect and share code for more sensor here.
The sensors I have code for, and have tested, is so far these:
TCA9548A I2C Multiplexer: https://www.adafruit.com/product/2717
TMP117 ±0.1°C High Accuracy I2C Temperature Sensor: https://www.adafruit.com/product/4821
SHT31-D Sensirion - Temperature & Humidity Sensor: https://www.adafruit.com/product/2857
Keller LD series pressure sensors: https://download.keller-druck.com/api/download/2LfcGMzMbeHdjFbyUd5DWA/en/2021-07.pdf
'Test program to read sensors with the I2C "Library"
'(c) 2022 john.hulth@geo.uio.no
'Wiring
'VDD on external 3.3 volt (dc/dc on SW12-1)
'C1 Clock SCL
'C2 Data SDA
'Pull up resistors 2.2 kOhm between C1 and 3V3
'Pull up resistors 2.2 kOhm between C2 and 3V3
SequentialMode 'Use SequentialMode
'Declare Constants
ConstTable Station_Constants
Const ScanInterval = 30 'Scan Interval
Const ScanUnit = Sec 'Scan Unit
Const TFInterval = 60 'Table File Interval
Const TFUnit = min 'Table File Unit
Const I2C_Sensors = True 'Use I2C Sensors
Const TCA_MUX = True 'TCA9548A 1-to-8 I2C Multiplexer
Const TMP117 = True 'TMP117 I2C Precision Temperature Sensor
Const SHT3X = True 'SHT3X I2C Temperature and Humidity Sensor
Const KellerLD = True 'Keller LD Pressure sensor
#If I2C_Sensors
Const I2C_port = C1 'C1 -> SCL, C2 -> SDA
Const I2C_BaudRate =100000
Const I2C_volt = 2 '1 -> 5V, 2 -> 3V3
Const I2C_Delay = 20 'mSec
#EndIf
#If TCA_MUX
Const TCA_adress = &H70
#EndIf
#If TMP117
Const TMP_adress = &H48
#EndIf
#If SHT3X
Const SHT_adress = &H44
Const HeatDelay As Long = 0 'mSec the heater will be on before measurement
#EndIf
#If KellerLD
Const KellerLD_adress = &H40
#EndIf
EndConstTable
'Declare include files
#If I2C_Sensors
Include "CPU:I2C_Sensors.CR1X" 'Must be after declaring constants
#EndIf
'Declare Variables
#If TCA_MUX
Public SelectMux_OK As Boolean
#EndIf
#If TMP117
Public ReadTMP_OK As Boolean
#EndIf
#If SHT3X
Public ReadSHT_OK As Boolean
#EndIf
#If KellerLD
Public ReadKellerLD_OK As Boolean
#EndIf
DataTable (Test,1,-1) 'Set table size to # of records, or -1 to autoallocate.
DataInterval (0,ScanInterval,ScanUnit,10)
TableFile ("CRD:Test_",8,-1,0,TFInterval,TFUnit,0,0)
#If TCA_MUX
Sample (1,SelectMux_OK,Boolean)
#EndIf
#If TMP117
Sample (1,ReadTMP_OK,Boolean)
Sample (1,TMP_Temp,IEEE4)
#EndIf
#If SHT3X
Sample (1,ReadSHT_OK,Boolean)
Sample (1,SHT_Temp,IEEE4)
Sample (1,SHT_RH,IEEE4)
#EndIf
#If KellerLD
Sample (1,ReadKellerLD_OK,Boolean)
Sample (1,KellerLD_P,IEEE4)
Sample (1,KellerLD_T,IEEE4)
#EndIf
EndTable
'Main Program
BeginProg
#If I2C_Sensors
PortPairConfig(I2C_port,I2C_volt)
I2COpen(I2C_port,I2C_BaudRate)
#EndIf
Scan (ScanInterval,ScanUnit,0,0)
SW12 (SW12_1,1 )
#If TCA_MUX
SelectMux_OK = SelectMux(6) 'Select channel 0-7
#EndIf
#If TMP117
ReadTMP_OK = ReadTMP() 'Read TMP117 Temperature
#EndIf
#If SHT3X
ReadSHT_OK = ReadSHT() 'Read SHT3X Temperature and Humidity
#EndIf
#If KellerLD
ReadKellerLD_OK = ReadKellerLD() 'Read Keller LD Pressure and Temperature
#EndIf
SW12 (SW12_1,0)
CallTable Test
NextScan
EndProg
Include file: "I2C_Sensors.CR1X"
'I2C "Library"
'(c) 2022 john.hulth@geo.uio.no
'Function to select MUX channel
#If TCA_MUX
Function SelectMux (i As Long) As Boolean
Dim j As Long
Dim Mux_Selected As Long
j = 1 << (i + 24) 'Move bit to first Byte plus selected Mux channel
'Set up for I2C
I2COpen(I2C_port,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'Select channel
I2CWrite (I2C_port, TCA_adress, j, 1, &H03)
Delay(0,I2C_Delay,mSec)
I2CRead (I2C_port, TCA_adress, Mux_Selected, 1, &H03)
If (i >= 0 AND i <= 7 AND Mux_Selected = j) Then
Return True
Else
Return false
EndIf
EndFunction
#EndIf
'Function to read TMP117 sensor
#If TMP117
Function ReadTMP () As Boolean
Const ConfigReg = &H010CC000 '0x01 Config Reg and 0x0CC0 One shot, 32 average, Conversion cycling time 500 ms
Const TempResReg = &H0000000 '0x00 Temperature result register
Dim dest As Long ' is able to read up to 4 bytes
Dim ConfigRegBack As Long
Public TMP_Temp : Units TMP_Temp = °C 'Final temperature
'Set up for I2C
I2COpen(I2C_port,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'set up sensor
I2CWrite (I2C_port, TMP_adress, ConfigReg, 3, &H03) '0x0CC0 One shot, 32 average, Conversion cycling time 500 ms
Delay (1,I2C_Delay,mSec)
I2CRead (I2C_port, TMP_adress, dest, 2, &H03)
dest = dest >> 8
ConfigRegBack = dest 'Gives back the settings (0x0CC0)
'Read temperature
I2CWrite (I2C_port, TMP_adress, TempResReg, 1, &H03)
Delay (1,500,mSec)'500 ms Conversion time needed for 0x0CC0
I2CRead (I2C_port, TMP_adress, dest, 2, &H03)
dest = dest >> 16
TMP_Temp = dest * 0.0078125
If (ConfigRegBack AND &H00ffff00) = (ConfigReg AND &H00ffff00)
Return True
Else
Return false
EndIf
EndFunction
#EndIf
'Function to read SHT3X sensor
#If SHT3X
Function ReadSHT () As Boolean
Const DReg As Long = &H24000000 'Measurement command for single shot data aquisition
Const StatReg As Long = &HF32D0000 'Get status register
Const HeatOn As Long = &H306D0000 'Turn heater on
Const HeatOff As Long = &H30660000 'Turn heater on
Dim statusOn As Long
Dim statusOff As Long
Dim dest(2) As Long' is able to read up to 8 bytes
Dim ta0 As Long ' raw data
Dim rh0 As Long
Public SHT_Temp As Float : Units SHT_Temp = °C 'Final temperature
Public SHT_RH As Float : Units SHT_RH = % 'Final relative humidity
'Set up for I2C
I2COpen(I2C_port,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'Read Temperature (before turning on the heater to avoid internal heating, can be 0.35-0.5 °C)
I2CWrite (I2C_port, SHT_adress, DReg, 2,&H03)
Delay (1,20,mSec)'Needed
I2CRead (I2C_port, SHT_adress, dest, 6, &H03)
MoveBytes(ta0, 2, dest ,0, 2)
SHT_Temp = -45 + 175 * ta0 / 65535
'Turn heater on
I2CWrite (I2C_port, SHT_adress, HeatOn, 2,&H03)
I2CWrite (I2C_port, SHT_adress,StatReg, 2,&H03)
I2CRead (I2C_port, SHT_adress, statusOn, 2, &H03)
statusOn = (statusOn >> (16+13)) AND &H00000001 'Heater status is in bit 13
Delay (1,HeatDelay,mSec) 'Time to keep heater on before measurement
'Read Humidity
I2CWrite (I2C_port, SHT_adress, DReg, 2,&H03)
Delay (1,20,mSec)'Needed
I2CRead (I2C_port, SHT_adress, dest, 6, &H03)
MoveBytes(rh0, 2, dest, 3, 2)
SHT_RH = 100 * rh0 / 65535
'Turn heater of
I2CWrite (I2C_port, SHT_adress, HeatOff, 2,&H03)
I2CWrite (I2C_port, SHT_adress,StatReg, 2,&H03)
I2CRead (I2C_port, SHT_adress, statusOff, 2, &H03)
statusOff = (statusOff >> (16+13)) AND &H00000001 'Heater status is in bit 13
If (SHT_Temp <> 130 OR SHT_RH <> 100) AND statusOn = 1 AND statusOff = 0
Return True
Else
Return False
EndIf
EndFunction
#EndIf
'Function to read Keller LD sensor
#If KellerLD
Function ReadKellerLD () As Boolean
Dim ScaleReg As Long 'Scale0 to scale 4 register adress, 0x12 to 0x16
Const MeasReg = &HAC000000 '0xAC Request Measurement (must be 4 bytes 0xAC 0x00 0x00 0x00!!!)
Dim i As Long
Dim status(6) As Long 'Sensor status msg
Dim scaling(5) As Long 'Raw scaling
Dim dest(2) As Long 'is able to read up to 8 bytes
Dim mode As Long '0 vented gauge, 1 Sealed gauge, 2 absolute, 3 not defined
Dim P_mode As Float
Dim year As Long 'Production date
Dim month As Long
Dim days As Long
Dim scaling12 As Long 'Raw P_min
Dim scaling34 As Long 'Raw P_max
Dim P_min As Float ': Units P_min = bar 'P_min should be retrived in program !!!
Dim P_max As Float ': Units P_max = bar 'P_max should be retrived in program !!!
Dim P0 As Long 'Raw pressure
Dim T0 As Long 'Raw temperature
Public KellerLD_P As Float : Units KellerLD_P = bar 'final pressure
Public KellerLD_T As Float : Units KellerLD_T = °C 'final temperature 12 bit
'Set up for I2C
I2COpen(I2C_port,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'Read Scaling 0 to 4
For i = 0 To 4 Step 1
ScaleReg = (i + &H12) << 24
I2CWrite (I2C_port, KellerLD_adress, ScaleReg, 1,&H03) '0xAC Request Measurement (must be 4 bytes 0xAC 0x00 0x00 0x00!!!)
Delay (1,2,mSec)'>0.6ms needed to read memmory
I2CRead (I2C_port, KellerLD_adress, scaling(i+1), 3, &H03) 'Read 3 bytes [STATUS, MS_word, LS_word]
Delay (1,2,mSec)
MoveBytes(status(i+1),3,scaling(i+1),0,1) 'Get status message
scaling(i+1) = (scaling(i+1) >> 8) AND &H0000FFFF 'removes status msg
Next
'Handel Scaling0
mode = scaling(0+1) AND &H00000003
year = ((scaling(0+1) AND &H00007800) >> 11) + 2010
month = (scaling(0+1) AND &H00000780) >> 7
days = (scaling(0+1) AND &H0000007C) >> 2
'Handle P-mode pressure offset (to vacuum pressure)
If (mode = 0) 'PA mode, Vented Gauge. Zero at atmospheric pressure
P_mode = 1.01325
ElseIf (mode = 1) 'PR mode, Sealed Gauge. Zero at 1.0 bar
P_mode = 1.0
ElseIf (mode = 2) 'PAA mode, Absolute. Zero at vacuum
P_mode = 0.0
Else 'Undefined mode
P_mode = 0.0
EndIf
'Handel Scaling1 and Scaling2, P_min
scaling12 = (scaling(1+1) << 16) + scaling(2+1)
MoveBytes (P_min,0,scaling12,0,4) 'MoveBytes converts from Long to Float
'Handel Scaling3 and Scaling4, P_max
scaling34 = (scaling(3+1) << 16) + scaling(4+1)
MoveBytes (P_max,0,scaling34,0,4) 'MoveBytes converts from Long to Float
'Read pressure and temperature
I2CWrite (I2C_port, KellerLD_adress, MeasReg, 1,&H03) '0xAC Request Measurement (must be 4 bytes 0xAC 0x00 0x00 0x00!!!)
Delay (1,20,mSec)'>8 ms needed for measurement 0xAC
I2CRead (I2C_port, KellerLD_adress, dest, 5, &H05) 'Read 5 bytes [STATUS, P_MSB, P_LSB, T_MSB, T_LSB]
MoveBytes(status(6),3,dest,0,1)
MoveBytes(P0,2,dest,1,2)
MoveBytes(T0,2,dest,3,2)
'Calculate pressure and temperature
KellerLD_P = (P0-16384)*(P_max-P_min)/32768 + P_min + P_mode
KellerLD_T = (T0-384)*0.003125-50 '16 bit
'T = ((T0>>4)-24)*0.05-50 '12 bit
If (status(1) = 64) AND (status(2) = 64) AND (status(3) = 64) AND (status(4) = 64) AND (status(5) = 64) AND (status(6) = 64)
Return True
Else
Return False
EndIf
EndFunction
#EndIf
You just saved me a load of time trying to figure out how to interface a TMP117 with a CR1000x. Many thanks!
Added the SHT40/41/45 sensors for temperature and humidity: https://www.adafruit.com/product/4885
'Test program to read sensors with the I2C "Library"
'(c) 2022 john.hulth@geo.uio.no
'Wiring
'VDD on external 3.3 volt (dc/dc on SW12-1)
'C1 Clock SCL
'C2 Data SDA
'Pull up resistors 2.2 kOhm between C1 and 3V3
'Pull up resistors 2.2 kOhm between C2 and 3V3
SequentialMode 'Use SequentialMode
'Declare Constants
ConstTable Station_Constants
Const ScanInterval = 20 'Scan Interval
Const ScanUnit = Sec 'Scan Unit
Const TFInterval = 60 'Table File Interval
Const TFUnit = min 'Table File Unit
Const I2C_Sensors = True 'Use I2C Sensors
Const SHT4X = True 'SHT40/41/45 I2C Temperature and Humidity Sensor
#If I2C_Sensors
Const I2C_port = C1 'C1 -> SCL, C2 -> SDA
Const I2C_BaudRate =100000
Const I2C_volt = 2 '1 -> 5V, 2 -> 3V3
Const I2C_Delay = 20 'mSec
#EndIf
#If SHT4X
Const SHT4X_adress = &H44
Const SHT4X_Heat As Boolean = False 'The heater will be on before humidity measurement (20mW for 1s) max duty cycle recommended is 5%
#EndIf
EndConstTable
'Declare include files
#If I2C_Sensors
Include "CPU:I2C_Sensors.CR1X" 'Must be after declaring constants
#EndIf
'Declare Variables
Public PTemp, Batt_volt
#If SHT4X
Public ReadSHT4X_OK As Boolean
#EndIf
DataTable (Test,1,-1) 'Set table size to # of records, or -1 to autoallocate.
DataInterval (0,ScanInterval,ScanUnit,10)
TableFile ("CRD:Test_",8,-1,0,TFInterval,TFUnit,0,0)
Minimum (1,Batt_volt,FP2,False,False)
Sample (1,PTemp,FP2)
#If SHT4X
Sample (1,ReadSHT4X_OK,Boolean)
Sample (1,SHT4X_Temp,IEEE4)
Sample (1,SHT4X_RH,IEEE4)
#EndIf
EndTable
'Main Program
BeginProg
#If I2C_Sensors
PortPairConfig(I2C_port,I2C_volt)
I2COpen(I2C_port,I2C_BaudRate)
#EndIf
Scan (ScanInterval,ScanUnit,0,0)
PanelTemp (PTemp,15000)
Battery (Batt_volt)
SW12 (SW12_1,1 )
#If SHT4X
ReadSHT4X_OK = ReadSHT4X() 'Read SHT4X Temperature and Humidity
#EndIf
SW12 (SW12_1,0)
CallTable Test
NextScan
EndProg
'Function to read SHT4X sensor
#If SHT4X
Function ReadSHT4X () As Boolean
Const SHT4X_HighPrecCmd As Long = &HFD000000 'Measure T & RH with high precision (high repeatability)
Const SHT4X_HeatCmd As Long = &H1E000000 'Activate lowest heater power & high precis. meas. (typ. 20mW @ 3.3V) for 1s
Dim dest(2) As Long' is able to read up to 8 bytes
Dim ta0 As Long ' raw data
Dim rh0 As Long
Public SHT4X_Temp As Float : Units SHT4X_Temp = °C 'Final temperature
Public SHT4X_RH As Float : Units SHT4X_RH = % 'Final relative humidity
'Set up for I2C
I2COpen(I2C_port,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'Read Temperature (before turning on the heater to avoid internal heating, can be 0.35-0.5 °C)
I2CWrite (I2C_port, SHT4X_adress, SHT4X_HighPrecCmd, 2,&H03)
Delay (1,10,mSec)'Needed
I2CRead (I2C_port, SHT4X_adress, dest, 6, &H03)
MoveBytes(ta0, 2, dest ,0, 2)
SHT4X_Temp = -45 + 175 * ta0 / 65535
'Do a new meassurement for Humidity if heating is used
If SHT4X_Heat
I2CWrite (I2C_port, SHT4X_adress, SHT4X_HeatCmd, 2,&H03)
Delay (1,1100,mSec)'Needed
I2CRead (I2C_port, SHT4X_adress, dest, 6, &H03)
EndIf
MoveBytes(rh0, 2, dest, 3, 2)
SHT4X_RH = -6 + (125 * rh0 / 65535)
If (SHT4X_Temp <> 130 OR SHT4X_RH <> 119)
Return True
Else
Return False
EndIf
EndFunction
#EndIf
A tip I have is to start testing with a low bitrate. Some sensors specify a minimum they can tolerate. Low bitrates are forgiving of wiring quality. For high bit rates, you may need short, fine gauge, shielded wires.
Hello,
This is a great resurce to create. very useful. I have a question on using I2C to control servo motors. I'm trying to use this servo controller board from Adafruit https://learn.adafruit.com/16-channel-pwm-servo-driver to control 8 servo motors on channels 0 to 7 on the board, how to use I2C in CRBasic to send the signal to each motor individually. I would appreciate your help on this. thank you.
Hello,
Trying to configure SHT-31 & SHT-45 on CR1000Xe with the below configuration:
'Wiring
'VDD on external 5 volt
'C1 & C3 Clock SCL
'C2 & C4 Data SDA
'GND to G
ConstTable Station_Constants
Const ScanInterval = 10 'Scan Interval
Const ScanUnit = Sec 'Scan Unit
Const TFInterval = 60 'Table File Interval
Const TFUnit = min 'Table File Unit
Const I2C_port_1 = C1 'C1 -> SCL, C2 -> SDA for sensor-1 (SHT-45)
Const I2C_port_2 = C3 'C3 -> SCL, C4 -> SDA for sensor-2 (SHT-31)
Const I2C_BaudRate =50000
Const I2C_volt = 1 '1 -> 5V, 2 -> 3V3
Const I2C_Delay = 20 'mSec
Const SHT3X = True 'SHT3X I2C Temperature and Humidity Sensor
Const SHT_adress = &H44
Const HeatDelay As Long = 0 'mSec the heater will be on before measurement
EndConstTable
Public PTemp, Batt_volt
Public ReadSHT1_OK As Boolean
Public ReadSHT2_OK As Boolean
Function ReadSHT_1 () As Boolean
Const DReg As Long = &H24000000 'Measurement command for single shot data aquisition
Const DReg1 As Long = &HFD000000 'Measurement command for single shot data aquisition
Const StatReg As Long = &HF32D0000 'Get status register
Const HeatOn As Long = &H306D0000 'Turn heater on
Const HeatOff As Long = &H30660000 'Turn heater on
Dim statusOn As Long
Dim statusOff As Long
Dim dest(2) As Long' is able to read up to 8 bytes
Dim ta0 As Long ' raw data
Dim rh0 As Long
Public SHT_Temp_1 As Float : Units SHT_Temp_1 = °C 'Final temperature
Public SHT_RH_1 As Float : Units SHT_RH_1 = % 'Final relative humidity
'Set up for I2C
I2COpen(I2C_port_1,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'Read Temperature (before turning on the heater to avoid internal heating, can be 0.35-0.5 °C)
I2CWrite (I2C_port_1, SHT_adress, DReg1, 2,&H03)
Delay (1,20,mSec)'Needed
I2CRead (I2C_port_1, SHT_adress, dest, 6, &H03)
MoveBytes(ta0, 2, dest ,0, 2)
SHT_Temp_1 = -45 + 175 * ta0 / 65535
'Turn heater on
I2CWrite (I2C_port_1, SHT_adress, HeatOn, 2,&H03)
I2CWrite (I2C_port_1, SHT_adress,StatReg, 2,&H03)
I2CRead (I2C_port_1, SHT_adress, statusOn, 2, &H03)
statusOn = (statusOn >> (16+13)) AND &H00000001 'Heater status is in bit 13
Delay (1,HeatDelay,mSec) 'Time to keep heater on before measurement
'Read Humidity
I2CWrite (I2C_port_1, SHT_adress, DReg1, 2,&H03)
Delay (1,20,mSec)'Needed
I2CRead (I2C_port_1, SHT_adress, dest, 6, &H03)
MoveBytes(rh0, 2, dest, 3, 2)
SHT_RH_1 = 100 * rh0 / 65535
'Turn heater of
I2CWrite (I2C_port_1, SHT_adress, HeatOff, 2,&H03)
I2CWrite (I2C_port_1, SHT_adress,StatReg, 2,&H03)
I2CRead (I2C_port_1, SHT_adress, statusOff, 2, &H03)
statusOff = (statusOff >> (16+13)) AND &H00000001 'Heater status is in bit 13
If (SHT_Temp_1 <> 130 OR SHT_RH_1 <> 100) AND statusOn = 1 AND statusOff = 0
Return True
Else
Return False
EndIf
EndFunction
Function ReadSHT_2 () As Boolean
Dim statusOn1 As Long
Dim statusOff1 As Long
Dim dest_1(2) As Long' is able to read up to 8 bytes
Dim ta1 As Long ' raw data
Dim rh1 As Long
Public SHT_Temp_2 As Float : Units SHT_Temp_2 = °C 'Final temperature
Public SHT_RH_2 As Float : Units SHT_RH_2 = % 'Final relative humidity
'Set up for I2C
I2COpen(I2C_port_2,I2C_BaudRate)
Delay(0,I2C_Delay,mSec)
'Read Temperature (before turning on the heater to avoid internal heating, can be 0.35-0.5 °C)
I2CWrite (I2C_port_2, SHT_adress, DReg, 2,&H03)
Delay (1,20,mSec)'Needed
I2CRead (I2C_port_2, SHT_adress, dest_1, 6, &H03)
MoveBytes(ta1, 2, dest_1 ,0, 2)
SHT_Temp_2 = -45 + 175 * ta1 / 65535
'Turn heater on
I2CWrite (I2C_port_2, SHT_adress, HeatOn, 2,&H03)
I2CWrite (I2C_port_2, SHT_adress,StatReg, 2,&H03)
I2CRead (I2C_port_2, SHT_adress, statusOn1, 2, &H03)
statusOn1 = (statusOn1 >> (16+13)) AND &H00000001 'Heater status is in bit 13
Delay (1,HeatDelay,mSec) 'Time to keep heater on before measurement
'Read Humidity
I2CWrite (I2C_port_2, SHT_adress, DReg, 2,&H03)
Delay (1,20,mSec)'Needed
I2CRead (I2C_port_2, SHT_adress, dest_1, 6, &H03)
MoveBytes(rh1, 2, dest_1, 3, 2)
SHT_RH_2 = 100 * rh1 / 65535
'Turn heater of
I2CWrite (I2C_port_2, SHT_adress, HeatOff, 2,&H03)
I2CWrite (I2C_port_2, SHT_adress,StatReg, 2,&H03)
I2CRead (I2C_port_2, SHT_adress, statusOff1, 2, &H03)
statusOff1 = (statusOff1 >> (16+13)) AND &H00000001 'Heater status is in bit 13
If (SHT_Temp_2 <> 130 OR SHT_RH_2 <> 100) AND statusOn1 = 1 AND statusOff1 = 0
Return True
Else
Return False
EndIf
EndFunction
'Define Data Tables
DataTable (Minute,1,-1) 'Set table size to # of records, or -1 to autoallocate.
DataInterval (0,60,Sec,10)
Minimum (1,Batt_volt,FP2,False,False)
Sample (1,PTemp,FP2)
Average (1,SHT_Temp_1,FP2,False)
Sample (1,SHT_RH_1,FP2)
Average (1,SHT_Temp_2,FP2,False)
Sample (1,SHT_RH_2,FP2)
Average (1,SHT_Temp_3,FP2,False)
Sample (1,SHT_RH_3,FP2)
Average (1,SHT_Temp_4,FP2,False)
Sample (1,SHT_RH_4,FP2)
EndTable
'Main Program
BeginProg
PortPairConfig(I2C_port_2,I2C_volt)
I2COpen(I2C_port_2,I2C_BaudRate)
PortPairConfig(I2C_port_1,I2C_volt)
I2COpen(I2C_port_1,I2C_BaudRate)
Scan (ScanInterval,ScanUnit,0,0)
SW12 (SW12_1,1 )
PanelTemp (PTemp,50)
Battery (Batt_volt)
ReadSHT1_OK = ReadSHT_1() 'Read SHT4X Temperature and Humidity
ReadSHT2_OK = ReadSHT_2() 'Read SHT3X Temperature and Humidity
SW12 (SW12_1,0)
'Enter other measurement instructions
'Call Output Tables
'Example:
CallTable Minute
NextScan
EndProg
I am getting output of both the sensors but ReadSHT1_OK as false for SHT-45 but the difference between the RH of both is very high.
I would appreciate your help on this. thank you.
Hi, here is a test program for Sensirion SHT85 by Andrea Alberici - FondazioneOMD
'CR1000X Series Datalogger
'Sensirion SHT85 test
'Andrea Alberici - FondazioneOMD - 15/10/2025
'**** Wiring *****
'5V SHT85 Pin 2
'G SHT85 Pin 3
'C1 SHT85 Pin 1 - SCL
'C2 SHT85 Pin 4 - SDA
'2.2 kOhm 5V --> C1
'2.2 kOhm 5V --> C2
Dim OneShotCmd As Long = {&H24000000}
Dim Te_Temp As Long
Dim Rh_Temp As Long
Dim Dest(2) As Long
Public Te_CR1000
Public Te_SHT85
Public Rh_SHT85
BeginProg
PortPairConfig(C1,1)
I2COpen(C1,50000)
Scan (1,Sec,0,0)
PanelTemp (Te_CR1000,50)
I2CWrite (C1, &H44, OneShotCmd, 2,&H02)
I2CRead (C1, &H44, Dest, 6, &H05)
MoveBytes(Te_Temp,2,Dest,0,2)
MoveBytes(Rh_Temp,2,Dest,3,2)
Te_SHT85 = -45 + 175*Te_Temp/65535
Rh_SHT85 = 100 * Rh_Temp/65535
NextScan
EndProg
Note that when using the 5v output on the CR1000X, the logger needs to be connected to 12v, it's not enough with the USB power.