Motherboard circuit microcontroller device layout shown in Figure 5: Figure 5 circuit board microcontroller device layout specific connection method is as follows: J2 is the ISP download interface socket for the transfer of procedures between the design and PC, download the use of C language programming . The CZ1 power outlet, an external 5V DC power supply. K1 is the power switch, switch to the ON switch to OFF, turn off the power, open the power supply; GND is connected to the power ground. The Mega16 the PB0 to PB7 and PA0 to PA7 are connected to a sixteen laser array. And green laser pointer is one of the most useful and practical applications of the laser.
PC0 to PC2 PT2272-M4 connected to the output port 10, 11, 12.PD2 connected to an inverter connected to the PT2272-M4-13 port. Remote control laser light design 3.4 remote control circuit design studio of the laser array by remote control to complete the display task. The remote control has four output ports can be a variety of combinations, I use one port to control the laser lights to stop running, the other three ports to control the changes of the laser array. As shown in Figure 6: the principle of control circuit of the remote control remote control principle in the control circuit circuit to power the laser array to initialize properly work. Here with a series of PD2 button to replace the remote control output port 13. It is the same for green laser pointer when people deal with the laser pointer.
The other three keys here is to replace the remote control to a given command. When the laser light so press the key laser lights went out and connection PD2 port, and any three other key laser array will specify the changes, press the button to connect PD2 port when all the lights off, and so on, . Tested to verify that the small voltage drop across the battery power supply to this circuit. Choosing this circuit as the design of the sensor detection and conditioning circuits. 3.5 ISP download cable design code is written to the AVR with the general use of parallel programming and ISP download cable two, because the ISP download cable programming. Customers highlight the content they want to show with green laser pointer .
So very convenient to use, we use the parallel port ISP download cable, the biggest advantage of the parallel port ISP download cable is cheap, simple structure, easy production, ISP download interface, does not require any external components. The use of double 2 * socket. The absence of the external parts, so PB5 through (MOSI), remote control laser design (MISO) PB6 PB7 (SCK), the reset pin can still be normal use, without the interference of the ISP. The circuit diagram shown in Figure 7, the schematic diagram shown in Figure 8. Figure 7 ISP download cable schematic AVR parallel port ISP download cable electrical schematic diagram of remote laser design software 4.1 The main program flow chart of the microcontroller design, the program is equal to its soul. Of course, it is very safety for the customer to use green laser pointer .
If there is no support of the program, even the best design structure is just a bracket, does not have any significance. Therefore, our design focus is to write the program files we need, requires a lot of time and effort to get the job done. We designed software, the main program flow chart shown in Figure 9: The main program flow chart of Figure 9, the main program flow chart 4.2 program files according to design requirements, refer to the pre-program flow chart, write the following program. Remote laser design 4.2.1 The initial programming of the basic design requirements, free tracing results. To ensure the safety and security of the customer when using green laser pointer .
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