LED Module
18/10/2013 09:30
Figure 5 LED module driver circuit
3.3 Circuit Control System Design
3.3. 1 Controller Circuit Design
Master controller STC89C54RD + microcontroller core, by the microcontroller circuits , I / O interface driver circuit , system parameter storage circuit , key circuit, LCD display circuit , GSM remote control circuit and LED driver control circuit. Microcontroller C language program written for the control and set the LED drive current intensity , frequency and pulse width in order to meet the needs of the spectrum of flexible adjustment ; microcontroller circuit through the I / O interface , the serial data interface and LED constant current driver circuit , key circuit , LCD display interface circuit , GSM remote control circuit is connected to the data memory circuit . Each module combine their duties, coordination and cooperation .
3. 3. 2 GSM Remote Control System Design
Based on OEM board , use the serial port to communicate with C89C54 microcontroller . GSM remote control system includes a microcontroller system chip , the clock chip, watchdog chip , GSM interfaces , memory chips and driver chip ( see Figure 6 ) . This system can be the user's command information transmitted via text message to the microcontroller, then LED lamps lights off and light color remote control, has a simple structure , high reliability, and low cost.
