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arudinoprog

Schematics

Arduino based PIC programmer

Opis

Z noty katalogowej LM317T napięcie wyjściowe to

$V_{out} = V_{ref} \left(1 + \frac{R2}{R1} \right) + I_{adj} \cdot R2$

Przyjmując R1 = 470 R i pomijając wpływ Iadj (50 uA)

$R2 = \frac{R1(V_{out} - V_{ref})}{V_{ref}}$

Dla Vout = 13.5 i 9 V R2 wynosi odpowiednio 4606 i 2914 R

Future

Mandatory: enable/disable of Vdd to MCU.

ICSPDAT and ICSPCLK lines could have detection of impedace on PIC side. For program/verify mode on PIC, those lines should be in HI-Z state. Detection (and abort) could prevent destruction of some kind.

Charge pump for creating Vpp (13 V).

Linki

arudinoprog.txt · Last modified: 2016/08/01 21:16 by dmz