madchemist2227
New Member
Ok, I have had a rough time (as everyone else it seems) trying to program PIC16F84a 20MHz microcontroller. I have tried many types of serial designs with all kinds of software (except the dos ones) with no luck. However that was using voltage from the port itself and not an external powersupply wich may work.
So I decided to try the parallel port. I built an in-circuit parallel programmer based on the "par-pic" design (if you dont know use google). The only difference is I modified the artwork and added a power supply using a 7805 and 7812 regulator for the 5V and 13V from 18V of batt power. Below is a photo of the finished programmer.
<a href="http://smg.photobucket.com/albums/v205/madchemist/?action=view¤t=parpic2.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v205/madchemist/parpic2.jpg" border="0" alt="Parpic"></a>
I can't get this programmer to work with any of the traditional software. I have heard windows xp has issues with the lpt port, should I try it in dos? It'll of course read but it wont program. Most software wont even recognize that there is a programmer there. Is it a hardware problem or software?
Also, the original schematic used BC547 transistors, I used BC548, could that cause a problem?
So I decided to try the parallel port. I built an in-circuit parallel programmer based on the "par-pic" design (if you dont know use google). The only difference is I modified the artwork and added a power supply using a 7805 and 7812 regulator for the 5V and 13V from 18V of batt power. Below is a photo of the finished programmer.
<a href="http://smg.photobucket.com/albums/v205/madchemist/?action=view¤t=parpic2.jpg" target="_blank"><img src="http://img.photobucket.com/albums/v205/madchemist/parpic2.jpg" border="0" alt="Parpic"></a>
I can't get this programmer to work with any of the traditional software. I have heard windows xp has issues with the lpt port, should I try it in dos? It'll of course read but it wont program. Most software wont even recognize that there is a programmer there. Is it a hardware problem or software?
Also, the original schematic used BC547 transistors, I used BC548, could that cause a problem?
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