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urriellu.net => Projects => Electronics => pic³prog

pic³proc is a microcontroller programmer. It supports all the MCUs from Microchip (8 and 16 bit PICs and dsPICs). Most of the 8-bit PICs can be programmed using the built-in sockets of the programmer, and all of them can be programmed without being removed from the board of the circuit they are being used on, using ICSP (if the circuit is ICSP-ready). The list of MCUs that can be programmed using pic³prog depends on the programming software being used.

Most of MCU programmers has serial ports, but it is obsolete, nowadays a lot of computers doesn't include it, and not all manufactures employ the same wiring. The best choice is USB but the programmer would require a microcontroller on it, but obviously you can't program a MCU without a programmer. So after all the best choice was the parallel port.

This programmer is based on EPIC, a propietary programmer from Melabs. The original EPIC is expensive and incomplete: you need to buy some sockets, adapters or cables separately. pic³prog includes all of them and it is free.

Electronic schematic

pic programmer electronic schematicJ1 is a female DB25, so you need a male-male cable for the programmer-PC connection. This cable is a bit difficult to find but you could use a male DB25 instead of the female one.

ICSP and power connectors, and power-on LEDprogramming sockets 

The circuit requires an external power supply of 5V for the logic and 13.5V (you can use 12V) for turning the microcontroller into programming-mode.

It includes two LEDs: one of them shows when the circuit is power-on and the other one shows when the MCU is being programmed.

Using the built-in sockets almost all 8-bit PICs within a PDIP package can be programmed. It doesn't include a ZIF socket because it is much more expensive and less useful than ICSP.

 

PC-programmer connection

On Windows melabs Programmer and WinPicProg can be used as programming software.
On Linux you can use PiKdev, Piklab, Odyssey...
and any other programming software that supports the original EPIC or allows you to select the pin distribution of the parallel port, in that case you need to configure them as:

  • Pin 2 (D0) - Data output
  • Pin 3 (D1) - Clock
  • Pin 4 (D2) [inverted] - Vdd
  • Pin 5 (D3) [inverted] - Vpp
  • Pin 6 (D4) - Vpp/2
  • Pin 10 (ACK) - Data input

Warning: Jumper P3 must be connected (shorted) while using any programming software, but disconnected while using PiKdev.

 

Stripboard design

components, upper viewtracks, upper viewtracks, lower viewcomponents and tracks, lower viewcomponents and tracks, upper view 

 

Building it on a stripboard

unused stripboardunused stripboardmodding the female DB25 connectormodding the female DB25 connectorplacing the female DB25 connectorplacing the female DB25 connectorplacing the female DB25 connectorplacing the female DB25 connectorsoldering componentsplacing componentsplacing componentssoldering componentsplacing componentstracks viewsoldering components 

The pins of the female DB25 didn't fit the grid of the stripboard so I needed to modify it.

 

Adapter socket

For saving space on the stripboard just the 40-pin socket was placed on it, and adaptors were built so the rest of PICs could be plugged in.

The plastic part of the pins must be displaced a bit to the center so you can solder it on the tracks-side of the board.

modifying the pinsadapter socketadapter socketadapter socketadapter socket 

 

Power cable

power cablepower cableplugged in power cable 

The black wire is the ground, the red one in the middle brings 5V and the orange on the side has 12-13.5V.

 

PCB design

pic programmer footprintThe design has two sides, you can see red (top) and blue (bottom) tracks.

Ground an power planes should have been added, but they are not strongly necessary.

Letters are mirrored because you are seeing the upper view and they are placed on the lower side of the board.

"L³S" and "0x4CB353.net" are written on the board because that was the place where all my projects were going to be published before urriellu.net was born.

 

Building the PCB

upper side of the PCBlower side of the PCB 

 

Finished boards

Stripboard:
programmer on the stripboardprogrammer on the stripboardprogrammer on the stripboardprogrammer on the stripboard 

Stripboard with its adapter:
stripboard with adapterstripboard with adapterstripboard with adapterstripboard with adapter 

PCB:
PIC programmer PCBPIC programmer PCBPIC programmer PCBPIC programmer PCB