Datasheet

Sensor data
0x18 – 0x1B EC reading registers
Signed long
0x18 = MSB
0x1B = LSB
Units = µS
The last EC reading taken is stored in these four registers. EC is always expressed in
microsiemens. To read the value in this register, read the bytes MSB to LSB and assign
them to an unsigned long, cast to a float and divide that number by 100.
R/W
R/W
R/W
R/W
0x04: Interrupt control
0x05: LED control
0x06: Active/hibernate
0x07: New reading available
R/W
R
Read only
Read and write
Accessible registers
R/W
R/W
0x02: SMBus/I
2
C address lock/unlock
0x03: SMBus/I
2
C address
0x10: Temperature compensation MSB
0x11: Temperature compensation high byte
0x12: Temperature compensation low byte
0x13: Temperature compensation LSB
0x14: Temperature confirm MSB
0x15: Temperature confirm high byte
0x16: Temperature confirm low byte
0x17: Temperature confirm LSB
Confirmation
Compensation
R
R
0x00: Device type
0x01: Firmware version
Device information
Device address
R/W
R/W
0x08: Set probe type MSB
0x09: Set probe type LSB
R/W
0x0E: Calibrate request
0x0F: Calibration confirm
Probe type
Control
R/W
R/W
R/W
R/W
0x0A: Calibration value MSB
0x0B: Calibration value high byte
0x0C: Calibration value low byte
0x0D: Calibration value LSB
0x18: EC reading MSB
0x19: EC reading high byte
0x1A: EC reading low byte
0x1B: EC reading LSB
Sensor Data
R
R
R
R
R
R
R
R
R
R
R
R
0x1C: TDS reading MSB
0x1D: TDS reading high byte
0x1E: TDS reading low byte
0x1F: TDS reading LSB
R
R
R
R
0x20: Salinity reading MSB
0x21: Salinity reading high byte
0x22: Salinity reading low byte
0x23: Salinity reading LSB
R
R
R
R
Calibration
R
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
0x1C
0x1D
0x1E
0x1F
0x20
0x21
0x22
0x23
Example
Reading an EC of 0.07μs
MSB
LSB
0x07
0x00
0x00
0x00
Step 1 read 4 bytes
Read
Read
Read
Read
0x18
0x19
0x1A
0x1B
0x07
0x00
0x00
0x00
Step 2 read unsigned long
0x00000007
Step 4 divide by 100
7.00 0.07/ 100 =
Step 3 cast unsigned long to a float
7.00
0x00000007
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