LCD wiring to Program port

[jgannon]

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.

[Mike Betts]

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.

[jgannon]

Originally Posted by Mike Betts

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.

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.

[Kevin Watson]

Originally Posted by jgannon

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.

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

-Kevin

[jgannon]

Originally Posted by Kevin Watson

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

-Kevin

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?

[russell]

My LCD only works on RS-232 voltage levels

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.

[jgannon]

Originally Posted by russell

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.

*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.

[Kevin Watson]

Originally Posted by jgannon

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?

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

[jgannon]

Originally Posted by Kevin Watson

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

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

[russell]

Did it work?

[Mike Hendricks]

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.