Homemade AVR High Voltage Parallel Programmer

Just a few moments ago, there were just a few pieces of locked M8. It is estimated that even RESET was disabled. These chips could not be recovered through the download line. In order to reduce losses (now atmega8 online quotes 20 or more, still not sure that it is brand new original goods), so in the online search, the original AVR chip fuses are reprogrammable, unlike OTP fuses, once configured Can not be modified, but not the need for high-voltage programmers (12v, not the ISP download line can be competent), on Taobao looked at the price of finished high-voltage programmer can be expensive, and I am not often used, usually ISP download line is enough, and it is convenient. You can program without removing the chip from the target board. According to the current situation, it is imperative to make a simple high-voltage programmer, and Promoting our DIY spirit, I found some information and software, and prepared to make my own high-voltage parallel programmer. After a while, the programmer was finally done. Now I will share with you the production process and some experiences. Refer to the friends of interest.

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Description: High-voltage parallel programming, can restore most of the various locking chips to the factory default, especially for chips that are also disabled for reset. This high-voltage parallel programmer consists of a piece of M8 as the main control chip. After converting various PC instructions and programming data sent from the serial port, the target chip is programmed. Currently, M8 and M16 can be directly supported. M16 programming, so the schematic has been modified.

The final schematic is as follows:

With the schematic, the rest is the drawing board and the board, so the night of the light, the painted PCB-3D picture is as follows:

Then, there are two kinds of solutions. The first one is to make the board by yourself. With the thermal transfer method, the disadvantage is that it is more difficult, because I don't have a printer, and if you want, you can use the universal board. After all, the circuit comparison Simple, the second is to send PCB files to the special board to do, the disadvantage is to spend RMB, as for where to find, Taobao search has it, I am using the second program, tend to PCB I didn’t come back to find the components in the free time. The PCB board that was proofed back is as follows:

The pictures are a few pieces that are connected together.

Next is the welding element, the light is useless, the hands-on is practical, first welding horizontal and shorter components:

Re-weld large components:

The effect after completion is as follows:

Oh, it looks very small;

However, the programming at this time can't work, because it doesn't have a "soul". Below, we use the ISP line we used to do it, and inject the "soul" of the programmer into the master IC-M8.

The picture with the USB port is the last USB-ISP line. The following is the temporary AVR minimum system board. The first step: After connecting, open the software and configure the fuse, as shown in the figure:

Step 2: Click on the Flash, select the folder where the Hex file is located and open it.

The third step; click on the automatic; Hex file will be written to the microcontroller. As shown:

The progress bar shows the progress of the burning.

After writing, remove the chip and insert it into the board that has just been soldered. After connecting, open the M8HVPRO software. The first step is to set the port corresponding to your serial number if your serial port number is not the default COM1. No., then turn off the restart; third point: click on the communication detection, if the display connection is successful! Congratulations, your high voltage programmer is ready