Hi Mike, It's easiest to hook up a display to the OT1+ SMT board, because it's got lots of extra pins. You could do it on a regular OT1+, but you'd have to run wires to a lot of pins that don't have convenient connections.
Scott Micheal Hamby wrote: > > > Scott, Your the man. what's this I read about a display on open tracker > + is that for models newer than the one I have? I'm really happy with > the tracker 2 it does everything I need mobile. (wish I'd bought that > model first) Don't quite understand the send and receive function. > I've got an open tracker + that I run on a 9.6 rc car pack. Works > great for my second vehicle. > > 73 > Mike. > > ------------------------------------------------------------------------ > *From:* Scott Miller <[email protected]> > *To:* [email protected] > *Sent:* Sunday, September 20, 2009 2:55:24 PM > *Subject:* Re: [tracker2] Re: Tracker2 with LCD display > > > > Plugging in a display doesn't do anything to either serial port. The > display interface is entirely separate, and in fact the OT2m is > constantly sending data to it regardless of whether there's anything > connected. > > Scott > > Micheal wrote: > > > > > > --- In track...@yahoogroup s.com <mailto:tracker2%40yahoogroups.com> > <mailto:tracker2% 40yahoogroups. com>, > > Scott Miller <sc...@...> wrote: > > > > > > And if you're running the backlight off the T2's regulator, make sure > > > it's not drawing too much current. Some of the big ones can be pretty > > > power hungry. > > > > > > Scott > > > > > > Fred Hillhouse wrote: > > > > > > > > [Attachment( s) <#TopText> from Fred Hillhouse included below] > > > > > > > > Hi Steve, > > > > > > > > > > > > PIN Symbol Level Function > > > > 1 VSS - GND(0V) > > > > 2 VDD - Supply Voltage for Logic(+5V) > > > > > > > > 3 V0 - Power supply for LCD <-- A pot between 5V and GND with the > > wiper > > > > connected to PIN 3 works well. The contrast can be changed as > > > > temperature changes. > > > > > > > > 4 RS H/L H: Data; L: Instruction Code > > > > 5 R/W H/L H: Read; L: Write > > > > 6 E H/L Enable Signal > > > > 7 DB0 H/L <-- not used > > > > 8 DB1 H/L <-- not used > > > > 9 DB2 H/L <-- not used > > > > 10 DB3 H/L <-- not used > > > > 11 DB4 H/L > > > > 12 DB5 H/L > > > > 13 DB6 H/L > > > > 14 DB7 H/L > > > > > > > > ============ ====== > > > > 15 A - Backlight Power (+5V) > > > > 16 K - Backlight Power (0V) > > > > These connections should have a current limiting resistor added in > > > > series. At least on the ones I have used in the past. Actually a pot > > > > here helps to adjust the brightness as needed with a series fixed > > resistor. > > > > > > > > I added a portion of my schematic. I don't show the VO circuit or the > > > > backlight circuit either. I have a simple pot for VO. I think my > > pot is > > > > 20K. I am thinking my data sheet actually had a current listed > for the > > > > VO pin. > > > > > > > > I usually control the backlight with PWM (contrast too) but it > seems a > > > > bit overkill here. > > > > You will want to limit the current to the backlight LEDs. > > > > > > > > The Vf is 4.2 for the Y-G version. > > > > So > > > > 5.0V - 4.2Vf = 0.8V > > > > 0.8V / 0.180A = 5 ohms (rounded 4.44 to 5) > > > > A 5 ohm resistor in series with the backlight LEDs should keep it > safe. > > > > > > > > The Vf is 4.0 for the WHITE version. > > > > So, 5.0V - 4.0Vf = 1.0V > > > > 1.0V / 0.030A = 33 ohms > > > > A 5 ohm resistor in series with the backlight LEDs should keep it > safe. > > > > > > > > So depending on which model you find, either a 5 or 33 ohm resistor > > > > should keep the backlight in action. > > > > > > > > In you want to dim it further, then a pot in series with your other > > > > resistor can decrease the current (light output) without allowing > > you to > > > > overdrive the backlight. > > > > > > > > I also added pictures showing my additions to the Tracker2. And > > there is > > > > one of the LCD in action. > > > > > > > > Best regards, > > > > Fred > > > > > > > > > > > New to the group, ordered the pot and display , been sketching out an > > arduino circuit to handle the ascii strings coming in from the serial > > port and stripping out this info. This looks much simpler. I've got a > > opt+, and a TC2m plus I've built W2FS kit TNC-X (PIC bassed, just a kiss > > modem only, very limited) Great job on the Argent Data system tracker 2. > > I run an old HP100 PDA in my mobile setup and can see the aprs traffic > > scroll by but this screen will do the trick much better. Is the screen > > circuit going to disable the rs232 line? I send and receive limited > > messages and talk with my base station using messages. (running DigiNed > > and UIview32 in my shack) Still may replace the terminal with an AVR > > butterfly to handle the basic commands like digi on and BEA, POS etc. 73 > > Mike. > > > > > > >
