# i need a pic programmer....

#### leonheard

Joined Jan 8, 2013
48
i need a pic 16f84 programmer, i dont have a standart rs232 com port neither a printer connector in my pc, but i bought a usb to rs232 serial converter, ( i read in some forums that it wont work in programming ) not sure about that.

can u give me some links for a simple or advance diy programming schematics?

it doesnt need to be veeery good, just some basic so i can learn more about pics, and stuff...

thanks

#### tshuck

Joined Oct 18, 2012
3,534
What happened to the other one you mentioned here?

Save yourself the trouble you will undoubtedly have and get the Pickit....

#### spinnaker

Joined Oct 29, 2009
7,835
What happened to the other one you mentioned here?

Save yourself the trouble you will undoubtedly have and get the Pickit....

#### thatoneguy

Joined Feb 19, 2009
6,359
Get a PICKit 2 and save everybody, mostly yourself, a TON of headaches.

(Spinnaker will suggest a PICKit 3, but when you need a 3, you'll probably want features from both anyway)

#### takao21203

Joined Apr 28, 2012
3,695
Let him build a RS232 programmer if he wants to.

Look for a schematic which injects 12V externally, and then do that, either with a wall adapter (pretty dumb for 1mA), or with batteries.

Use a joulethief to generate the 12V

#### tshuck

Joined Oct 18, 2012
3,534
Let him build a RS232 programmer if he wants to.
We have no ability to prevent him from building it if he so chooses, but since he asked, we are attempting to give him a solution for what we feel is a better solution, especially considering that the USB -> RS-232 converters don't usually work for these things....

#### takao21203

Joined Apr 28, 2012
3,695
We have no ability to prevent him from building it if he so chooses, but since he asked, we are attempting to give him a solution for what we feel is a better solution, especially considering that the USB -> RS-232 converters don't usually work for these things....
How can they work? These old PICs need 12V programming voltage.
It's not that difficult however to build a RS232 programmer.

#### leonheard

Joined Jan 8, 2013
48
hahaha sorry if i bother you guys xD am just so interested in electronics, and i have money, but i wanted to build it myself ( dunno it makes it more interesting and i learn more about it ) i will try few times to do it myself, if i dont succeed then i will buy that ggoddamm pickit2 xD thanks for ur comments/ time and help.

have all a nice day

#### takao21203

Joined Apr 28, 2012
3,695
OK here it is shown how to supply Vpp externally:
http://www.pablin.com.ar/electron/circuito/mc/ppp/index.htm

Of course doing it that way is bad. You do not need 7805 or any power supply.
Use the regular RS232 circuit. You only need to supply 12V at 1 mA.

Take for instance this jouletheif circuit. It works without a transformer. One BC327 or 2n3906 is used. It is not difficult to build.

Here also some JDM circuits. You have to invert Vpp. And you do not need a transistor neccessarily. I did not use one in my design.

My reason was the same, I just wanted to do it for exercize purpose. Took me some hours!

I also have switch on the programmer, so I can use the jouletheif to power the circuit as well. It produces 14 volts or so, but the voltage goes down if it is only loaded with a few mA. The PIC isn't destroyed because it has clamping diodes, and they will only conduct a few mA.

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#### nigelwright7557

Joined May 10, 2008
532
I use a PICSTART, its rs232 and pretty old but it works very well and there is not setting up just put pin 1 of the pic to pin 1 of the ZIF socket and it works.

#### spinnaker

Joined Oct 29, 2009
7,835
hahaha sorry if i bother you guys xD am just so interested in electronics, and i have money, but i wanted to build it myself ( dunno it makes it more interesting and i learn more about it ) i will try few times to do it myself, if i dont succeed then i will buy that ggoddamm pickit2 xD thanks for ur comments/ time and help.

have all a nice day
Buy a pickit 3 and then build a pickit 2. There is a clone of a pickit 2 if you search. It is supposed to use the Microchip code.

Then you will have built your own and have best of both worlds a Pickit 3 and PicKit 2.

#### tshuck

Joined Oct 18, 2012
3,534
Buy a pickit 3 and then build a pickit 2. There is a clone of a pickit 2 if you search. It is supposed to use the Microchip code.

Then you will have built your own and have best of both worlds a Pickit 3 and PicKit 2.
The Pickit 2 schematic is pages 81 & 82 here