Low Cost MEMS Inertial Measurement Unit

ER-MIMU-064 Low Cost MEMS Inertial Measurement Unit

Introduction

Inertial Measurement Unit, referred to as IMU, is a device to measure the  angular velocity and acceleration of the three axis of the object. With the built-in accelerometer sensor and gyroscope, the IMU can measure the linear acceleration and rotation angular velocity from three directions and can obtain the attitude, velocity and displacement information of the carrier through the resolving.

ER-MIMU-064 integrates a three-axis MEMS gyroscope and a three-axis accelerometer, with a built-in data fusion algorithm to output high-precision attitude angle, motion speed and displacement information in real time, providing complete motion state perception for the device without the need for additional complex calculation modules, thus reducing the difficulty of system development.

Features

Smallest volume: 38.6mm x 44.8mm x25.5mm

Light weight: ≤70g

Temperature compensation: -40℃~ + 80℃

Products with wide voltage design: 6v~12v

Flight control, gimbal stabilization

Aerial photography attitude compensation

Intelligent driving ADAS assistance,

Vehicle body posture

GNSS integrated positioning

Application

Azimuth, attitude, position measuring and keeping in GNSS-assisted INS

Heading, pitch, roll measuring in AHRS for UAV

Motion survey and keeping in MRU

Attitude & azimuth keeping, positioning in IMU

Stabilizing & Pointing in satellite antenna, target tracking system

Robotic Control & Orientation in autonomous machines, unmanned vehicles

Specifications

ER-MIMU-064
Item	Parameter	ER-MIMU-064	Unit
Gyro performance
Range		400	deg/s
Scale Factor at 25°C		20000	LSB/deg/s
Scale Factor VS Temperature (1σ)		500	ppm
Scale Factor Non-Linearity (1σ)		<200	ppm
Bias Instability(1σ 25℃)		3	deg/hr
Bias stability (10s 1σ)		5	deg/hr
Angular Random Walk		<0.25	°/ √h
Bias Repeatability(1σ 25℃)		5	deg/hr
Accelerometer performance
Range		30	g
Bias Stability (10s 1σ)		<75	ug
Bias Repeatability		100	ug
Bias Temp Coefficient		<20	ug/℃
Bias Temp Hysteresis		<1.5	mg
Scale Factor Non-linearity		<500	ppm
Scale Factor Month Repeatability		<30	ppm
Scale Factor Temp Coefficient		100	ppm/℃
Class II Non-linearity Coefficient		<100	ug/g²
Scale Factor		250000	Lsb/g
Environment and power
Operate temperature		-40~+80	℃
Storage temperature		-55~+105	℃
Power supply		6~12V DC	V
Power (Power supply 6)		2	W
Communication interface		RS-422
Physical characteristics
Size		38.6 x 44.8 x 25.5	mm
Weight		≤70	g

 

Dimension

Product composition and working principle

The product is mainly composed of three-axis MEMS accelerometer and gyroscope. The working principle is as follows: the gyroscope and accelerometer data are collected by ARM microcontroller, three high-precision gyroscopes are collected by 1-channel digital interface SPI, and three accelerometers are collected by another 1-channel digital interface SPI. All sensors are calibrated and compensated in software after acquisition.

Product technical characteristics

a)The product is designed for miniaturization and low power consumption;

b)Products with wide voltage design;

Electrical interface

The MIMU inertial measurement unit uses J30J-15ZKN-J output. Electrical pin definitions are shown in Table 1.

Table 1 Pin definition of MIMU high precision inertial measurement unit

Pin number	Electrical characteristic	Signal direction	Remark
1	VCC	Power +	6-12V
2	Retain, disable
3	GND	Power supply -
4	Retain, disable
5	Retain, disable
6	RS422,TX+
7	RS422,TX-
8	RS422,RXD+
9	RS422,RXD-
10	Retain, disable
11	Retain, disable
12	Retain, disable
13	Retain, disable
14	Retain, disable
15	Retain, disable

Communication protocol

RS-422 serial interface, default baud rate 921600bps, 8bit data bit, no check bit, 1bit stop bit, The default data refresh rate is 400Hz.

Data output protocol

Byte	Define	Note	Range	Units
1~4	Protocol Head	EB8055AA
5~8	X axis angular rate	int	-400~+400	Degree/s
9~12	Y axis angular rate	int	-400~+400	Degree/s
13~16	Z axis angular rate	int	-400~+400	Degree/s
17~20	X axis accelerated speed	int	-30~+30	m/s^2
21~24	Y axis accelerated speed	int	-30~+30	m/s^2
25~28	Z axis accelerated speed	int	-30~+30	m/s^2
29~32	IMU temperature	float
33	Frame count	unsigned char	1~255
34	Sum	unsigned char	Byte 3~60 summation

Test interface operation description

The user installs the test interface on the computer,open xInsConnect.exe, as shown below.

Click "COMCFG" to configure the baud rate of RS422 serial port, which is the COM port required; Click the "Open" button to open the RS422 communication interface and power on the IMU.

The Angle data of X,Y,Z gyro "GX,GY,GZ", the data of X,Y,Z accelerometer "ACCX,ACCY,ACCZ" will be displayed on the interface. The temperature data of IMU will be displayed in the "TX" box. Click "CAL" box to set the data update rate of the interface to 100. The "Counter" box displays the frame serial number for each frame of data.If the product is outside the IMU measurement range, it is shown in the right figure.

Precautions for use

1)Installation error description

Internal orthogonal compensation has been carried out for the whole product. If the platform used by the product cannot guarantee the accuracy of the benchmark after installation, please compensate the installation error accordingly.

2)Installation and protection

When the product is installed, it should be tightly installed parallel to the base level of the carrier installation (the installation error with the base level should be less than 0.05°).

Because the product is a precision test instrument, although there is a shell protection, in order to protect the product damage, users should handle gently. The use and movement of the product should avoid falling, and be sure not to let the product and other components in the use of serious impact, to ensure the accuracy of the product datum requirements.

After sale

If there is any technical problem or failure in the use of the product, you can contact the corresponding technical personnel of our company.

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Application Techniques

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