ATMega Fuse Doctor

thingiverse

All AVR Microcontrollers from Amtel feature unique fuse bits that dictate their configuration. These special bits determine how the microcontroller operates, influencing settings such as whether an external crystal is used or if the reset pin can be utilized as a IO pin. Configuring the reset pin as a IO pin will prevent the processor from being reprogrammed via an ISP programmer. You might wonder why this would be necessary. An 8-Pin microcontroller boasts 5 IO pins and a Reset pin, totaling 6 usable ports if the Reset pin is configured correctly. If you make a mistake and inadvertently burn the wrong fuses, rendering the microcontroller inoperable, the AVR HV Fuse Doctor can repair fuses and reset them to factory defaults. This project is based on Atmega Fusebit Doctor (HVSP) by manekinen, found at instructables.com. A DC Panel Socket has been incorporated into this design, allowing it to be powered by a 12VDC power brick. I created the board using the toner method and soldered wires from the DC Panel Socket to its back. PCB & Assembly --------------- Visit instructables.com for detailed PCB assembly instructions. Printing --------- 3D print with supports. Drill out PCB mount holes using a 2.5mm drill, then create threads using a 3mm tap. Use M3 x 6mm screws. The DC Panel socket can be obtained from eBay at ebay.com/itm/264475807135.