Keyboard value input into the data buffer, read the contents of the data buffer in the main program, the implementation of the keyboard function subroutine subroutine.

(3) ambient light (lightning, fireworks discharge) of the solar panel sampling voltage has a clear image, in the day, evening, the recognition, the software delay, the general control in 2 ~ 3min.

(4) external interrupt is high priority interrupt, the preparation of subroutines to achieve load overcurrent, short circuit protection, it is necessary to take full account of the load start moment will have several times the rated current of the inrush current, the impulse current maintained at 3ms ~ Software to take measures to avoid short-circuit and load open miscarriage of justice. Determine the load over-current, short circuit, cut off the load output. After the load is cut off, the load switch should be turned on at intervals of 20 ms. When the overcurrent and short-circuit signals are cleared, the load output will be restored. Otherwise, the load switch will remain open.

(5) To protect the load (lamps), the battery over-discharge protection recovery, the application software to set a hysteresis voltage, so the load switch does not appear shaking phenomenon, is conducive to extending the life of the lamp.

(6) According to the characteristics of Data Flash of STC12C5410AD, the ISP / IAP command must be started when the data is written. After the CPU waits for IAP action timing, the program will be executed. Also note that data is written to the Data Flash memory and can not span sectors.

4.4.1 Comparison of the characteristics of various light sources
Light source selection for solar street light is the most critical step, the current light source for solar street light less to reduce the loss of limited energy, light source as far as possible the election of DC light source. The current common light source has a DC energy-saving lamps, high-frequency electrodeless lamp, low pressure sodium lamp and LED light source.
(1) low-voltage energy-saving lamps: low power, high luminous efficiency, but the service life of 2000 hours