USBasp - USB ISP/TPI programmer stick for Atmel AVR microcontrollers with 5V and 3.3V target voltage based on the design by Thomas Fischl. More information can be found at https://www.fischl.de/usbasp/. Windows users may need to install a driver. Of course this is not necessary for linux and mac users. Close SELFPROG and TGTPWR jumper when uploading firmware. If you are burning a fresh microcontroller, close the Slow Serial Clock jumper (SLOWCLK) since they are factory programmed for internal 1MHz oscillator. This is not necessary if the improved firmware by nerdralph (https://github.com/nerdralph/usbasp) is used. Close Taget Power jumper (TGTPWR) to power target device from the USBasp. |Jumper|Function| |-|-| |TGTVCC|Close to power target device via ISP header| |SELFPRG|Close to upload firmware to USBasp itself via ISP header| |SLOWCLK|Close to upload firmware to target device with slow speed (necessary for factory-new microcontrollers); not needed with improved firmware|      This work is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported License. (http://creativecommons.org/licenses/by-sa/3.0/)