LCD wiring to Program port
 

I am in the process of wiring up a BPP-420 LCD to the Program port on our RC for use with Kevin Watson's serial port code. I have pin 3 of the serial connector connected to the data pin on the LCD, I have the +5 pin from a digital I/O connected to the +5 pin on the LCD, and I have pin 5 and the ground from a digital I/O connected to the ground pin on the LCD. Is this the proper wiring? I couldn't find an actual pinout of the Program port, so I just went with the RS-232 standard, but I want to make sure it's right before I power it up.

Re: LCD wiring to Program port
 

Refer to page 11 of "2004 Full-Size Robot Controller Reference Guide".

If I call +5V pin 1, then pin 1 goes to +5 of the LCD, Pin 2 goes to data in of the LCD and pin 4 goes to ground on the LCD.

Re: LCD wiring to Program port
 

That's the TTL port, not the Program port. My LCD only works on RS-232 voltage levels, and besides, I'm already using the TTL port for the camera.

Re: LCD wiring to Program port
 

Did you get this working? I've wired my LCD to use pin 2 as it's source of serial data.

-Kevin

Re: LCD wiring to Program port
 

I haven't tested it yet, because I'm particularly afraid of the magic smoke when working with something this expensive. I will move the data line over to pin 2. Do I have the other wiring correct?

Re: LCD wiring to Program port
 

Someone just told me in another thread that RS-232 is does 5 to 15 volts. Dont see how that is going to help you, but it might and I dont feel like thinking too much. Actually I think it was that thread about reprogramming in competition.

Re: LCD wiring to Program port
 

*shrug* The specs make no difference to me. My LCD needs +5 for power, and RS-232 level data. I can get the +5 from any of the dig I/O pins, and I can evidentally get RS-232 data from the Program port. All I need to do is figure out how to wire it.

Re: LCD wiring to Program port
 

Yes, it looks fine. Connecting the LCD data line to pin 3 of the program/serial port wouldn't smoke anything because it's the serial port's Rx line.

-Kevin

Re: LCD wiring to Program port
 

Excellent. Thank you very much, Kevin. I can't wait to hook this up tomorrow. I'll let you know how it goes.

Re: LCD wiring to Program port
 

Did it work?

Re: LCD wiring to Program port
 

Heh. I dont think he finished soldering it. Other priority projects took over his (and the person doing the soldering) time. When he gets it finished and working .. we'll get some pictures of it and post it.