Parameters: 
1. Power supply voltage: power is supplied to the USB bus or pin header, and the power supply voltage is the same as the working voltage of the chip;
2, crystal: 8M;
3. PCB board size: 7.4cm*3.4cm;
 Features:
1. Classic ATmega8/ATMEGA48 minimum system, eliminating the trouble of soldering;
2.23 IO parts are introduced for easy expansion. ;
3. Standard ISP download interface, use our store usb ASP downloader to achieve easy download of the minimum system program (the board does not need separate power supply, support ISP download interface power supply), convenient program download and debugging;
4. Support chip: ATMEGA8, ATMEGA48 and pin-compatible chip, the routines sent are ATMEGA8 and ATMEGA48;
5. With a self-locking switch, it can flexibly control the on/off of the USB female input power of the system, which is convenient for users to carry out various tests (the power supply to the pin header input or the ISP download port does not have an on-off function);
6. Flexible and diversified power supply mode: It can be powered by ISP download port, can be powered by standard USB interface, and can also be used for power supply.
7. External expansion of 3 channels of VCC, GND;
8. Reset: power-on reset and button reset;