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USBasp – buffered mini programmer with 5V/3,3V

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Vermes

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It is an USBasp programmer closed in housing of old PenDrive USB.

Assumptions:
  • buffered outputs going into state of high impedance after saving/reading is complete
  • handling of input signal levels 3,3V and 5V switched by a single switch
  • possibility to program the programmer by the same connector (without the need to provide additional connector)
  • reduced sensitivity to voltage spikes

The microcontroller is powered by a small resistor, behind it there is a 10uF capacitor, what quite effectively eliminates voltage fluctuations. Buffer goes into high impedance state without any problems, what is useful for programming systems which use SPI connector.

Pictures:



Link to original thread - USBasp - buforowany mini programator z napięciami 5V/3.3V
 

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