With the development of information technology, intelligence and network, embedded system technology has gained a broad space for development, and the field of industrial control has undergone a huge transformation. Real-time embedded hardware and software technology based on 32-bit high-end processor platform. Will be applied in every corner of industrial control. The embedded controller has many advantages such as small size, high reliability, strong function, flexibility and convenience. Its application has penetrated into various fields such as industry, agriculture, education, national defense, scientific research and daily life. Product upgrades, accelerated automation, and increased productivity have played an important role in driving.
Design of obstacle distance detection circuit
In this system, the ultrasonic ranging circuit is designed by MICROCHIP's PIC16C57. The selected ultrasonic sensor is T/R40-16 piezoelectric ceramic sensor. In operation, the main controller PIC16C57 sends a signal to cause the ultrasonic transducer of the transmitting end to emit a voltage excitation. After being excited, the ultrasonic wave is transmitted in the form of a pulse. When the ultrasonic receiver receives the echo signal, it returns to the main controller. In the middle, the timer in the master starts counting when the pulse signal starts transmitting, and stops when the echo signal is received. The time interval of the side is multiplied by the speed of sound to obtain twice the distance value. Thereby the distance from the obstacle to the launch point is calculated. Its circuit diagram is shown in Figure 2.
Figure 2 Ultrasonic distance measurement circuit diagram
The distance value is serially output through the 10 pins of the PIC16C57, and is connected to the ARM serial port via the MAX232 chip. The chip MAX232 is an interface circuit designed for the RS232 standard serial port, which completes the conversion of TTL level and RS232 level.
Sound and light alarm circuit design
This system requires a three-level alarm for dangerous conditions based on the critical value of the obstacle distance that affects the stability of the loader. When in a low-risk condition, only the indicator green light is illuminated to alert the driver; when the danger level is increased, the indicator light is lit, accompanied by a soothing beep to remind the driver to take action; At the highest level of danger, the red light is illuminated and the beep sounds from soothing to rush, alerting the driver to brake. In the design, P2.20 (GPIOA4) of LPC2290 is used to drive the green LED, P2.21 (GPIOA5) drives the yellow LED, P2.22 (GPIOA6) drives the red LED, and P2.23 (GPIOA7) drives the buzzer. The designed alarm circuit is shown in Figure 3.
Figure 3 alarm circuit
Through the test, the system has completed the required functional requirements, the maximum measured value is 9.99m, the error is ≤0.01m. Installation is very convenient and easy to use. However, there is still a deficiency in the system, that is, when the ultrasonic sensor is used to detect the road surface information in front of the vehicle, if the raised obstacle can be effectively detected, but the current square is not detected, it needs further research.
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