Chuck Hellebuyck

Has anybody created a GCB project that works with this USB Host module? http://www.hobbytronics.co.uk/usb-host-serial I'd like to make a USB Host that can control a 3D printer from a PIC by serially sending GCodes and receiving data back.

That's because that was a parallel port programmer. PICkit only needs 5 connections as you found out. Very simple.

The jumpers are to connect the 6 pin header to the proper pins for the device size you are using when the device is placed into the top of the ZIF socket (Pin 1 to Pin1). You would have to find the instructions for that ZIF adapter or use a meter to figure it out. For PICs, 8, 14 and 20 pin chips use the same pin locations for Data, CLK and MCLR. 28 pin devices all use the same pinout and 40 pin all share the their same pinout. So the jumpers switch between those three groups. An 18F25K40 and 18F25K22...

LVP is low Voltage Programming. It's an option on many devices. High Voltage Programming (HVP) uses the MCLR pin connection on the programmer (PICkit2/PICkit3) to produce a high voltage (9-15v) very low current signal that puts the device into programming mode. Then the CLK and DATA shift in the 1's an 0's. I don't recommend LVP in most cases, especially if you have access to a PICkit programmer. If you design the robot board with the isolation resistors, then you should have no issues programming....

You need CLK and DATA to program the PIC. Those arent pullup resistors. They are series isolation resistors typically in the 100 ohm range. They allow the CLK and DATA i/o pins to be connected to your circuit without the circuit affecting the CLKand DATA signal. If you power the PIC circuit separately, the programner will sense it and wont power the board.

I believe the datasheet has a typo. It's missing a W. It shows R-1/1 when it should say R/W-1/1 like other devices. The second 1 in 1/1 is meaningless otherwise. That bit needs to be writeable to set the edge.

Looks like you got the rubber hose couplings as well not the metal couplings. That printed better than mine as my extruder didn't work. If you just print from the SD card you never need to install Arduino drivers. It's only for updating the firmware or running it directly from the computer. Have fun.

I reviewed that printer about a year ago. https://www.youtube.com/watch?v=jv_tRVZrN68