Metal signal detection car
Project lifecycle: Sept.2016–Oct.2016
Table of Contents
The metal signal detection car uses TI’s inductive sensor (LDC1000) to detect and track the wire on the ground.
The structure of the system includes universal wheel car, stepping motor and drive, main control board, battery, steering gear and sensor.
The realization principle is to use the sensor coil mounted on the steering gear to detect the wire. According to the detected wire position, the stepper motor can be controlled to accelerate and turn.
2. Hardware design
2.1. Core circuit board
The core circuit board provides interface, schematic diagram and PCB for MCU, LDC1000, Bluetooth, OLED and other modules, as shown in Figure 1:
2.2. Universal wheel car
The car is equipped with stepping motor and universal wheel, which can realize forward and steering, as shown in Figure 2:
The system uses TM4 series microcontroller (Figure 3) as the main control chip.
2.4. Inductive sensor
LDC1000 (Figure 4) is the world’s first inductor to digital converter. Provide low power, small package, low cost solutions. Its SPI interface can be easily connected to MCU.
2.5. Stepping motor and its drive
The system uses 42 stepper motor (Figure 5), uses microprocessor timer function to trigger pulse to control stepper motor forward speed, differential turning, and determines the distance of automatic car driving process by counting the number of pulses. TB6050 stepper motor drive module (Figure 6) is used to control the motor speed and driving distance.
2.6. Steering gear
This system uses S3010 steering gear (Figure 7) to control the direction of the car. The inductance sensor carried by the steering gear is used to detect the road, and the steering angle is used to control the motor speed and direction.
3. Software design
In each control cycle, the sensor data is collected first, then the collected data is judged and processed, and then the steering gear and motor are controlled, and then the next control cycle is entered.