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SHT-3-05  MEMS-Gyro North Finder

1. Product Description

SHT-3-05 MEMS gyro north finder is mainly used to quickly and independently determine the true north direction. It consists of two high-precision MEMS gyros, high-precision three-axis MEMS accelerometer, processing circuit and power supply circuit.  The high-precision MEMS gyro tracks and measures the angular velocity of the earth rotation. By using the different components of the angular velocity of the earth rotation sensitive to the gyroscope on the X and Y axes, the azimuth information of the product reference axis is obtained. Then, the tilt data of the product axial are obtained through the accelerometer, and the tilt compensation of the azimuth is carried out.  Not affected by magnetic and other environment!

While the MEMS gyro north finder is fast and autonomously north-seeking, the user can also calibrate it through the serial port command to improve the north-seeking accuracy again.

2.Product features

1) Built-in 0.02°/h MEMS gyro, 10ug MEMS accelerometer

2) High reliability and stable performance

3) Small size, light weight

4) Strong impact resistance and vibration

5) The zero position can be corrected again through the serial port to improve the accuracy of north finding

6)  Not affected by magnetic and other environment!

3.Main Specifications

Azimuth measuring range 0~360º

Azimuth measurement accuracy 0.5°(The accuracy after calibration is 0.2 °)

Azimuth resolution 0.01º

Inclination measurement range±30º

Inclination measurement accuracy:  ±0.1º

Inclination resolution  0.01º

North seeking time 3min

Preparation time    30s

Power supply +9V-36VDC (recommended supply voltage: 12V)  

Digital output  RS422 or RS485

weight             240g

Operating temperature:  -40℃~+85℃

Attack:                100g,11ms

Dimensions:            58*58*30mm

Working mode:  static state

4. Wiring ports and definitions

 

1)J30J-9ZKP definition

Pin No.

Definition

Illustration

1

+12V

Positive power supply

2

GND

Power ground

3

Tx+/A

Data output positive /485A

4

TX-/B

Data output negative /485B

5

RX+

Data input positive

6

Rx-

Data input negative

7,8,9

Factory Used

Factory Used, It is forbidden to connect any level.

 

2)Data output protocol

Byte sequence no.

Signal name

Range

Significant bit

 

Definition

Note

0

Char1


8

Frame header

The hexadecimal number AA

1

Char2


8

Frame header

The hexadecimal number 55

2

State


8

State word

0x00

Activating the North Finder

0x01

Startup is normal. Northfinding can be performed.

0x02

Looking for North

0x03

After north seeking, you can find north again

0x11

Start exception

3、4

Roll

-30°~30°

16

Roll angle

Complement, the third byte is the low byte, 1lsb = 0.01 °

5、6

Pitch

-30°~30°

16

Pitch angle

Complement, the 5th byte is the low byte, 1lsb = 0.01 °

7、8

Azimuth

0°~360°

16

azimuth

No sign number, the 7th byte is the low byte, 1lsb = 0.01 °°

9

Sum


8

Checksums

The check sum is the algebraic sum of all bytes from 2 bytes to 8 bytes, taking the lower 8 bits.

 

3)North seeking command input frame format (4 bytes in total)

Byte sequence no.

meaning

significant bit

Note

0

North seeking command

8

Hexadecimal number 24

1

8

Hexadecimal number 4E

2

8

Hexadecimal number 46

3

8

Hexadecimal number 2A

 

 4)Zero calibration command

Byte sequence no.

meaning

significant bit

备注

0

Position 1 acquisition command

8

Hexadecimal number EB

1

8

Hexadecimal number 90

2

8

Hexadecimal number AA

3

8

Hexadecimal number 50

0

Position 2 acquisition command

8

Hexadecimal number EB

1

8

Hexadecimal number 90

2

8

Hexadecimal number AA

3

8

Hexadecimal number 51

 

5. Dimensions

 图片11.png

 陀螺寻北仪03.jpg

Download:

sht-3-05(en).pdf

 

 

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