1. The motor driver adopts L298N

Adopts photoelectric isolation structure 2. Power supply

The power supply is powered by DC12V lithium battery 3. Sensor

1. Temperature and humidity sensor

Digital temperature and humidity sensor SHT30, ±3% RH accuracy, DFN package;

Humidity range: 0~100%RH;

Accuracy: ±3%RH;

Response time: 8S;

Supply voltage: 2.4V ~5.5V;

Output type: IIC

Lichuang number: C77361

2. Gas sensor

Bosch air pressure sensor BMP280 can measure atmospheric pressure, with high-precision temperature measurement, and can be calibrated to accurately calculate altitude.

I2C or SPI interface, wide range (300-1100hpa), high accuracy

Lichuang number: C83291

3. Geomagnetic sensor MMC5983MA

Superior dynamic range and accuracy:

±8G FSR

18-bit operation

0.4mG total rms noise

Allowed heading accuracy ±0.5º

Maximum output data rate 1000H

I2C slave, fast (≤400KHz) mode, supports SPI protocol

Lichuang number: C404329

4. Ambient light sensor BH1730FVC-TR

Digital 16-bit I2C serial output

Does not support close range detection

Working voltage: 2.4V~3.6V

Wavelength: 600nm

Lichuang number: C79616

5. Attitude sensor MPU-6050

Digital output X, Y and Z angular rate sensors (gyros), user programmable full scale ±250, ±500, ±1000, ±2000°/sec

External synchronization signal connected to FSYNC pin supports image, video and GPS synchronization

Integrated 16-bit ADC can simultaneously sample the gyroscope

Enhanced bias and sensitivity temperature stability reduces the need for user calibration

Improve low frequency noise performance

Digitally programmable low-pass filter

Factory Calibrated Sensitivity Scale Factor

Digital output three-axis accelerometer, programmable full scale ±2g, ±4g, ±8g and ±16g

Integrated 16-bit ADC enables simultaneous accelerometer sampling without the need for external multiplexers

Direction detection and signaling

Programmable interrupt

High-G interrupt

9-axis motion fusion via on-chip digital motion processor (DMP)

Auxiliary master I2C bus to read data from external sensors such as magnetometers

3.9mA operating current for all 6 motion sensing axes and DMP enabled

VDD power supply voltage range 2.375V-3.46V

Flexible VLOGIC reference voltage supports multiple I2C interface voltages (MPU-6050 only)

Smallest and thinnest QFN package for portable devices: 4x4x0.9mm

Minimum cross-axis sensitivity between accelerometer and gyroscope axes

The 1024-byte FIFO buffer allows the host processor to read data, thus reducing power consumption. When the MPU collects more data, it bursts and then enters a low-power mode.

Digital output temperature sensor

User-programmable digital filters for gyroscopes, accelerometers, and temperature sensors

10,000 g impact resistance

400kHz fast mode I2C is used to communicate with all registers

1MHz SPI serial interface to communicate with all registers (MPU-6000 only)

20MHz SPI serial interface to read sensor and interrupt registers on MPU-6000

6. Noise sensor

The sound enters the LM358 comparator through the microphone, and then uses the ADC signal to collect and interpret the noise.

4. NRF24L01+ communication module

Type: TxRx only

RF Series/Standards: Universal ISM > 1GHZ

Modulation: GFSK

Frequency: 2.4GHz

Data rate (maximum): 2Mbps

Sensitivity: -94dBm

Serial interface: SPI

Voltage - Power supply: 1.9 V ~ 3.6 V

Current - Receive: 12.6mA ~ 13.5mA

Current - Transmission: 7mA ~ 11.3mA

Working temperature: -40°C ~ 85°C

Package/Casing: 20-VFQFN Exposed Pad

5. Storage circuit

Using four-channel AT24C64

Introduction to single AT24C64:

Internal organization 4096 x 8,8192 x 8

2-wire serial interface

Schmitt trigger, noise suppression filtered input

bidirectional data transfer protocol

Write protect pin for hardware data protection

32-byte page write mode (allows partial page write)

Self-timed write cycle (maximum 10 ms)

High reliability

5. Tracking module 6. Remote control

STM32F103C8T6 master remote control

Onboard NRF24L01+ communication module, ESP8266

Reserved interfaces for expansion

7. Main control board

The main control board adopts HK32F103VET6 development board

Link: https://oshwhub.com/DF-211/hkf103c8t6-kai-fa-ban-677952a

8. NBIoT Ding Wei Qi

Tutorial link: https://www.bilibili.com/video/BV1eV411t7fn

In addition, friends who have no experience in drawing circuit diagrams can go to station B to watch the latest teaching video of Lichuang EDA2020

https://www.bilibili.com/video/BV1EE41147yV