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Date Posted: 20:07:09 10/22/01 Mon
Author: Johnny
Subject: Re: PIC problems
In reply to: Rookie 's message, "Re: PIC problems" on 01:09:58 10/20/01 Sat

Hi, I used to have the same problem with my ludipipo
programmer (jdm alike) and the answer is the programming
voltage for pin 4 (/MCLR), the 16F84A series need a voltage
of 12-14V on /MCLR, otherwise it won't program the pic.

So if you're using icprog, it has an option to test the
hardware, there you can activate the voltages on the
programmer and measure the voltage between /MCLR and
ground. Mine measured 10V (as most desktop pc's do),
so this is what i did (scrappy solution because i had
the ludipipo already built with pcb and everything):

The power from the serial port comes from pin 3 of the DB9
connector, so I cut the cable and put a 3V battery (coin
alike) in series with it (- to the DB9 side, + to the
programmer). As a result I got 13V feeding the programmer
and it worked like a charm.

A proper solution would be to add an external voltage source
(meybe using a wallmart adaptor and a voltage regulator ic)

Hope this helps

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