The parking space detection system circuit design includes AMR sensor node circuit, including node power supply part, parking space magnetic field acquisition part, data preprocessing part and radio frequency transceiver part, etc.; RFID reader circuit, including RF transceiver part, WiFi part, data processing part and control section. The basic circuit of the AMR sensor node is shown in the figure. The power supply part is operated by TI's APL5312-33 to the LDU function. The power supply input voltage is 4.2 V and the output is 3.3 V. The magnetic field strength detection uses the MMC2122MG AMR sensor, which has the characteristics of small size, long life, high sensitivity, low energy consumption and stability. It can be widely used in electronic compass, GPS navigation, position sensing, vehicle detection and magnetic measurement. The MMC2122MG is a two-axis magnetoresistive sensor that performs signal processing on the chip and integrates an I2C bus. It does not require A/D conversion and can be directly connected to the microprocessor.
The MSP430F2618 with low power consumption and high performance is used to preprocess the collected data, communicate with the 2.4 GHz radio frequency chip CC2500 through its own SPI port, and upload the preprocessed data packet to the RFID reader. It also receives instructions from the RFID reader. The RF transceiver part of the RFID reader is shown in Figure 5. The CC2500 communicates with the reader control unit via SPI. The CC2591 increases the link budget by providing a power transmitter to improve the output power. The CC2591 has a low noise figure. Noise amplifiers (LNAs) to improve receiver sensitivity, power amplifiers (PAs), switching RF matchers, and balun circuits for simple design in high-performance wireless applications. The WiFi module adopts EMB-380-I1 developed by Shanghai Yuke Information Technology Co., Ltd. The module integrates TCP/IP protocol stack and WiFi communication mode driver. The maximum baud rate of the serial port is 115 200 b/s. The data processing and control part adopts ST's STM32F100C4. This chip supports SPI port and serial port, communicates with CC2500 through SPI port, and communicates with WiFi module through serial port.
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