Low Cost MEMS IMU

ER-MIMU-M01
With a relatively low price, it is suitable for application scenarios with low precision requirements and limited budgets, such as some simple toy robots and low-cost sensor nodes. It can provide users with basic attitude and motion sensing functions.

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Introduction

ER-MIMU-M01 Low Cost MEMS IMU

Introduction

M01, with its economical price, has become the first choice for users who value cost-effectiveness. Although its precision is relatively the lowest among the three products, it is still equipped with a 3-axis gyroscope and a 3-axis accelerometer, which can provide users with basic acceleration and angular velocity measurement functions. It meets the needs of application scenarios with low precision requirements, such as motion control of simple toy robots and preliminary monitoring of object motion status by low-cost sensor nodes.

Product Features

Economical and practical: With a relatively low price, it is suitable for application scenarios with low precision requirements and limited budgets, such as some simple toy robots and low-cost sensor nodes. It can provide users with basic attitude and motion sensing functions.

Low-power operation: While ensuring high performance, it achieves lower power consumption, effectively extending the battery life of devices. It is particularly suitable for mobile devices and IoT terminals that rely on battery power and have high requirements for battery life.

A cost-effective choice: On the premise of ensuring certain precision and performance, the M01C series focuses on optimizing the cost structure, providing a cost-effective solution for customers who are price-sensitive but need inertial measurement with a certain level of precision. For example, in fields such as some consumer robots and toy drones, it can not only meet basic functional needs but also control costs, thereby enhancing product competitiveness.

Application Fields

UAVs and aeromodels: Provide accurate attitude and acceleration data for aircraft to achieve stable flight, precise positioning and route planning, and improve flight performance and safety.
Robot field: Help robots achieve precise motion control, balance adjustment and environmental perception, enabling them to flexibly and stably complete tasks in complex environments, such as autonomous navigation of service robots and high-precision operations of industrial robots.
Wearable devices: Used to monitor human movement posture, step counting, movement trajectory recording, etc., providing accurate data for applications such as health monitoring and sports analysis, and enhancing user experience.
Industrial automation: Play an important role in motion monitoring and control of automated production line equipment, equipment vibration detection, etc., helping to improve production efficiency and ensure the safe operation of equipment.

Product Performance Indicators

The performance indicators of the micro inertial measurement unit are shown in Table 3.1.

Type		M01A	M01B	M01C	Unit
Gyro	Measuring range	±500	±500	±500	°/s
	Bias instability	≤2	<2.5	<3	°/h
	Bias stability (1 σ)	≤8	<10	<15	°/h
	Bias repeatability (1 σ)	≤8	<10	<15	°/h
	Angle random walk	≤0.15	<0.17	<0.21	°/ √h
Accelerometer	Linear acceleration measurement range	±16g	±16g	±16g	g
	Bias stability	≤0.2	0.28	0.4	mg
	Bias repeatability	≤0.2	0.3	0.5	mg
Electrical Specification	Voltage	3.3±0. 15	3.3±0. 15	3.3±0. 15	V
Electrical Specification	Operating temperature range	-45℃~＋85℃	-45℃~＋85℃	-45℃~＋85℃	℃
Else	Weight	<9	<9	<9	g
	Size	23.723.79.9	23.723.79.9	23.723.79.9	mm
	Shock resistance	≥2000	≥2000	≥2000	g
	Vibration	≥20g	≥20	≥20	grms
	Electrical interface	UART	UART	UART	-
	Connector（--）	FTMH-110-02-L-DV-ES	FTMH-110-02-L-DV-ES	FTMH-110-02-L-DV-ES	-

Note: The ranges of the gyroscope and accelerometer can be customized. The customizable range of the gyroscope is ±125dps-±4000dps; the customizable range of the accelerometer is ±2g-±16g.

Product Outline Dimensions

The outline dimensions of the micro inertial measurement unit are shown in Figure 2.1.

Figure 2.1 Outline Dimension Drawing

4.Electrical Interface and Communication Protocol

4.1 Electrical Interface Definition

The interface is a Samtec connector. The product end model: FTMH-110-02-L-DV-ES, defined as shown in Figure 4.1 and Table 4.1. Mating end model: CLM-110-02-L-D.

Figure 4.1 Output Interface Pin Definition Diagram

Table 4.1 Output Interface Pin Definition

Pin	Pin definition	Pin definition
7	SOUT	UART output
9	SIN	UART input
10，11，12	Vcc	power supply 3.3V
3，4，8，15	GND	power ground

Note: The SOUT and SIN of the UART output are based on the product.

4.2 Communication Protocol

The default baud rate of the micro inertial measurement unit is 460800, with 1 start bit, 8 data bits, 1 stop bit, no parity check, and a refresh rate of 400Hz. Its output frame format is shown in Table 4.2.

Table 4.2 Output Data Frame Format

serial number	project	byte	type
1	FH(frame header)	1	0xAA
2	FH(frame header)	1	0x55
3	GYRO_X	4	float
4	GYRO_Y	4	float
5	GYRO_Z	4	float
6	ACCL_X	4	float
7	ACCL_Y	4	float
8	ACCL_Z	4	float
9	Temper	4	float
10	Frame end	1	0xEB
11	Frame end	1	0x80

5. Installation Requirements

It is recommended to use M2.5 or M2 screws for fixing. The mounting hole distance refers to Figure 2.1, and M2.5 or M2 threaded holes are processed on the mounting surface.

6. Usage Steps

(1) Set the input voltage according to the specified voltage of the product, and power on the product according to the electrical interface definition;
(2) Set according to the communication protocol, and check whether the output signal meets the performance index requirements. The product can be used normally if the installation and electrical connection are correct.

7. Precautions

(1) Pay attention to the product's electrical interface definition. When using, please strictly follow the arrangement of the terminals to avoid wrong connection;
(2) The product is a precision measuring device. During operation, be careful not to have impacts, collisions and other unexpected situations beyond the product's bearing range;
(3) The installation of the product has a great impact on angular velocity measurement. To avoid introducing installation errors, the installation plane is required to have good flatness;
(4) To ensure measurement accuracy, the product must be installed firmly and reliably to avoid measurement errors caused by looseness;
(5) When installing and using the product, attention should be paid to anti-static protection, and it is recommended to wear an anti-static wristband;
(6) Please operate in strict accordance with the requirements of this manual, confirm that the external environment is consistent with the use requirements. If problems occur, do not open the product cover or change the internal structure of the product. If there are any problems, please contact our technical personnel in time.