I am trying to build a GPS speedometer. I have seen many people do it before but their displays were too small for my needs. I purchased the Ultimate GPS breakout board (part 746), an Arduino Uno R3 and the 2.8" TFT Touch Shield (part 1651).
Solution ideas:
Since the TFT shield covers all the I/O pins:
Option #1: Can I solder the GPS leads to the backside of the Uno. If so, do I use the same pins that are in the Ultimate GPS wiring shows or will those conflict with the display's pins needs?
Option #2: I do not have a need for the display to be a shield so I could separate it from the Arduino. If I did, which pins need to be jumpered between the boards?
If the TFT shield conflicts with the GPS.
Option #3: If I buy a breakout version of the same display, will that work? I love the TFT display and I will use it for another project if I can't use it for this. Touch is not a requirement (just a perk).
Any help would be appreciated.
Ultimate GPS & TFT Touch Screen
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- adafruit_support_mike
- Posts: 67446
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Re: Ultimate GPS & TFT Touch Screen
Soldering to the underside of the Uno will work, and you can use female-to-male jumpers (https://www.adafruit.com/products/826) to connect the necessary pins of the Arduino to the TFT Shield.
You could also use one of our Wingshields: https://www.adafruit.com/products/196
You could also use one of our Wingshields: https://www.adafruit.com/products/196
- gearmesh
- Posts: 15
- Joined: Fri Apr 03, 2015 9:56 am
Re: Ultimate GPS & TFT Touch Screen
Thanks.. I ordered both suggestions as I will need whichever one I don't use this time, for my next project.
Last edited by gearmesh on Sat Apr 04, 2015 11:22 am, edited 1 time in total.
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: Ultimate GPS & TFT Touch Screen
The shield uses pins 4, 8, 9, 10, 11, 12, 13, 5V and GND. Use pins 2 and 3 for the GPS.
- gearmesh
- Posts: 15
- Joined: Fri Apr 03, 2015 9:56 am
Re: Ultimate GPS & TFT Touch Screen
Everything worked just as you explained. My project is working! There is no case for it yet but that can come later.
Is there a way I can power off just the display programmatically? Like set a pin low or something? This way I could power down the display while the unit is not in motion for 5 minutes or so, then I could power it back on once the Arduino+gps sees my speed go over 1 or 2 mph. I also purchased the powerboost shield + 2000mAh battery as part of the project to power the solution.
Is there a way I can power off just the display programmatically? Like set a pin low or something? This way I could power down the display while the unit is not in motion for 5 minutes or so, then I could power it back on once the Arduino+gps sees my speed go over 1 or 2 mph. I also purchased the powerboost shield + 2000mAh battery as part of the project to power the solution.
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: Ultimate GPS & TFT Touch Screen
Maybe. Which display did you wind up with? Post a link to the product pagegearmesh wrote:Is there a way I can power off just the display programmatically?
- gearmesh
- Posts: 15
- Joined: Fri Apr 03, 2015 9:56 am
Re: Ultimate GPS & TFT Touch Screen
I have the 1651
https://www.adafruit.com/product/1651
and am running the PowerBoost Sheild
https://www.adafruit.com/product/2078
If I could power off just the display and keep the Arduino & gps on, then I could trigger powering up the display upon movement.
https://www.adafruit.com/product/1651
and am running the PowerBoost Sheild
https://www.adafruit.com/product/2078
If I could power off just the display and keep the Arduino & gps on, then I could trigger powering up the display upon movement.
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: Ultimate GPS & TFT Touch Screen
Please see this tutorial page:
https://learn.adafruit.com/adafruit-2-8 ... -touch-irq
https://learn.adafruit.com/adafruit-2-8 ... -touch-irq
- gearmesh
- Posts: 15
- Joined: Fri Apr 03, 2015 9:56 am
Re: Ultimate GPS & TFT Touch Screen
That post is perfect. Thanks. I will implement that next week.
Here is it outside of the case... and..
Here is it outside of the case... and..
- adafruit_support_rick
- Posts: 35092
- Joined: Tue Mar 15, 2011 11:42 am
Re: Ultimate GPS & TFT Touch Screen
Looking good!
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