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Location:HKR-11C Dermal-Resistance Sensor

HKR-11C Dermal-Resistance Sensor

HKR-11C Dermal-Resistance Sensor uses external excitation current to detect the changes of dermal resistance. This sensor uses a precision operational amplifier, output high precision of physical quantity of dermal resistance change data. The product has the characteristics of compact size, easy to use, can be widely used in various types of analysis system based on dermal resistance signal.
Specifications
§   Power supply: USB
§   Range: 100K – 2.5M
§   Accuracy: 2.5K
§   Inaccuracy: +/-2%
§   Sampling frequency: 50Hz
§   Baud: 57600 bps
How to use
1.  Install the device driver CP210x. Please do not connect the sensor to the computer when you install the driver.
2.  Connect the sensor to the computer, check the device virtual port number.
3.  Run the demo program.
4. Performed the Dermal-Resistance test, clean skin surface, attached the electrode pads to the index finger and middle finger to measure.

 
Communication Protocol
1.   Hardware interface: USB (USB to UART Bridge).
2.   Baud: 57600 bps. Data format: 8bit data, 1bit stop, no verify.
3.   Frame data format
Head Fixed 0xF0
Command Data  
BYTE 1 Data
BYTE 2  
 
BYTE n  
CKSUM CKSUM
 
4.   Communication Commands
a)   Start data upload
Master -> Sensor: 0xF0 0xC0 CKSUM
Sensor -> Master: 0xF0 0xC0 RH RL CKSUM
PS: The sensor will automatically upload data after the start of sampling at 50Hz sampling frequency, Unit: KΩ. Data 0 represents resistance is less than 70K, data 1 indicate overload.
    RH RL -> Data
b)   Stop data upload
Master -> Sensor: 0xF0 0xC1 CKSUM
Sensor -> Master: 0xF0 0xC1 CKSUM
c)   Read serial number
Master -> Sensor: 0xF0 0xC2 CKSUM
Sensor -> Master: 0xF0 0xC2 SN0 SN1 SN2 SN3 CKSUM
d)   Read the production date
Master -> Sensor: 0xF0 0xC3 CKSUM
Sensor -> Master: 0xF0 0xC3 T0 T1 T2 T3 CKSUM

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