CNC Rotary table/lathe head indexing

[Kwackers]

Hi rasta,

I assume by "did not work for me" means you can't get the device to work?

I can confirm the PCB is correct (it's the one mine is built from), the schematic shows a voltage divider which will work, as will the simple variable resistor version on the pcb.

The circuit is pretty simple, as long as the PIC is programmed correctly and connected to the LCD then you should get a display.

Try the following.

Adjust the contrast - do you get anything on the display at one end of the contrast range? (This may just be squares.)

If not, check power (5v) is getting to the LCD and check the connections are correct.

If you get squares, this suggests either the PIC isn't running or the connections to the LCD are faulty (short or open circuit).

If you programmed the PIC yourself check the config bits are set (actually it doesn't look like they are contained in the .hex file in the above zip - I've attached a new .hex file that definitely has them set, please try this).

If the PIC is programmed correctly and the connections to the LCD seem ok then the only other thing that would stop it working is the area around the xtal and the two decoupling capacitors connected to it.

Hope this helps, let me know how you get on.