In order to promote the use of renewable energy and accelerate the construction of a resource-saving and environment-friendly society, solar energy utilization is gradually gaining people's attention. Solar street lamps are gradually replacing traditional street lamps as high-tech energy-saving products. Aiming at the characteristics of solar street lamps, a solar street lamp network monitoring system is introduced, which is the connection between the slave and the host through the RS485 interface. The working status and various operating parameters of the solar panel, battery and LED lamp head of the slave to each slave. After monitoring, the host transmits the test result to the monitoring center or related technical staff through SMS or voice through the MC39i module to realize networked monitoring of the solar street light. The current solar street light control system is an independent photovoltaic control system, which is mainly composed of six parts: solar battery, battery, LED street light, controller, charging circuit, discharge/load driving circuit. The system structure diagram of the host is shown in Figure 1. The solar panel output is directly connected to the battery after being adjusted by the CUK circuit. The system main control chip adopts DSPIC30F3011 single-chip microcomputer to realize solar panel voltage acquisition, battery voltage acquisition, control CUK circuit, control LED lamp head, 485 communication between master and slave, host and monitoring. Functions such as connection between the center or staff. Figure 1 System structure of the host Control circuit hardware circuit design The main control chip of the control circuit adopts DSPIC30F3011 single-chip microcomputer. The main control functions include: solar panel voltage acquisition; CUK circuit gating control; battery voltage acquisition; unloading circuit control; LED lamp head control; RS485 communication; GSM module sending SMS control; Control; work mode control, etc. The schematic diagram of the host is shown in Figure 2, Figure 3 and Figure 4, where Figure 2 is the schematic diagram of the main control chip DSPIC30F3011. Figure 3 shows the voltage sampling circuit and the CUK circuit. Since the solar panel voltage and the battery voltage vary from 0 to 35 V, and the A/D input voltage range of the microcontroller is 0 to 5 V, the sampling voltage is divided. After being transmitted to the A/D conversion channel of the microcontroller, the CUK circuit is used to adjust the maximum output power point of the solar panel, and its strobe switch is controlled by the PWM3 output of the single chip microcomputer. 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