Need schematics for rs232 programer for pickit programer :)

[elementHTTP]

Hi there

I need schematic for rs232 programer for pic18F2550 and/or pic18F4550 pls

these are pickits whit usb

variant 1. uses pic18F2550
**broken link removed**

and/or

variant 2. uses pic18F4550
**broken link removed**

to use these first i need to build rs232 programer for pic18F2550 and/or pic18F4550 to program them


thanks

 

[FoxyRick]

Search is your friend:

https://www.edaboard.com/threads/238522/
https://www.edaboard.com/threads/191823/
https://www.edaboard.com/threads/256813/

 

[elementHTTP]

Thanks for quick answer !

few noob questions
- for these two they use 16f series can i use it for pic18F2550 and/or pic18F4550 ?
JDM With External Power - Some Help Needed
pic serail programmer
- is it good idea to use usb to rs232 converter ( lack of serial port ) ?

 

[FoxyRick]

JDM programmers are dependent on the software used as to which PICs they can program. The 18F2550/4550 are supported in the software I have seen. Read the Advanced JDM Programmer link for some software.

Usually, JDM-style programmers need a real RS232 port because they make use of the real RS232 signal levels to make a voltage multiplying power supply. Often (most/all?) USB-Serial converters do not have the required output levels, so probably will not work.

However, Fragrance's Advanced JDM circuit is externally powered and does not depend on the serial port for power, so this one might work on a USB converter. Why not ask in that thread for advice on that matter?

Another alternative is this circuit, which generates its power supply from a USB connection (only power, not USB data, and you would need another USB socket for the converter) so again, this might work with a USB converter for the serial.

**broken link removed**

Please note that I have not tried the above circuit, or Fragrance's circuit, since I made my own JDM programmer a long time ago and programmed another PIC to make a better programmer.

 

[elementHTTP]

Hmmm this is getting little complicated
is there a way to upload data ( or program it ) direly from usb to PIC ?
instead going to such conversion from rs232 to usb

something like this ( it uses Ft232RQ)
https://www.picaxe.com/docs/axe027.pdf
( schematics at last page 16)

 

[picgak]

As FoxyRick rightly pointed out JDM programmers wont work propperly when you use usb to rs232 converter try to burn your HEX file from a good old PC having rs232 port
regards ani

 

[elementHTTP]

question
is cable at top left on breadboard 12 power supply ? (first 10 sec of video )
i can maybe use this to upload data
https://www.youtube.com/watch?v=Im5WH8KUS7Q

i am unable to find old rs232 so i will find another solution

 

[FoxyRick]

Yes, that looks like a power supply. It's hard to see exactly on the breadboard, but you can see wires hopping from the suspected PSU to the power lines on the PIC.

 

[elementHTTP]

This looks very interesting !!
it uses a MCP2200 from microchip and few zener diodes

project
http://dangerousprototypes.com/2011/01/18/hack-open-source-usb-stack-on-mcp2200/

data sheet
**broken link removed**


Anyone had experience whit this ?