GPS map navigation and routing

zen · #1 (**permalink**) 09-15-2007, 04:48 AM

Hi experts,

Need advise on how to draw map for PPC and to do routing using GPS data.

Rgds

Erel · #2 (**permalink**) 09-15-2007, 08:37 PM

Example of reading the GPS data: http://www.basic4ppc.com/files/GPSExample.zip
Once you've got the coordinates, depending on your map you could convert them to UTM format using the GPS library.
Now you need to calculate the location on the map (the image) and draw it.

eddy_ys · #3 (**permalink**) 10-06-2007, 02:20 AM

Erel,

I wrote an application which sends the coordinate and speed via sms when the speed reaches certain value.
However, I don't need a continuous monitoring. All I want is the GPS check the speed every 15 minutes and if the speed exceeds the limit, it will send the sms.
How to turn of the GPS during the idle time before the next 15 minute time elapses?
I find my PPC battery drains out very quickly when my application runs. I guess the cause is from the GPS being turned on and receiving satellite signals continuosly.
Please enlighten!

Erel · #4 (**permalink**) 10-06-2007, 07:51 AM

Try to close the serial port.
Most GPS will usually turn off if there is no connection for a while.

How do you manage to keep the device on for 15 minutes?
The best solution is to connect the device to a car charger.

eddy_ys · #5 (**permalink**) 10-07-2007, 07:17 AM

Erel,
Good question to me.
For this purpose, I keep the device on while turning the backlight OFF (from Settings).

I know this only saves the battery from using it power for the backlight.
Still it consumes power because the device is not OFF.

Could you suggest how to turn off the device while maintaining the application runs in the background?
The device shall also be able to be turned ON again after a predefined time.

Homework....

Erel · #6 (**permalink**) 10-07-2007, 08:05 AM

Your application can't run when the device is turned off.
You could try to use Hardware.RunAppAtTime to wake up the device.
Note that not all devices support this function.

eddy_ys · #7 (**permalink**) 10-07-2007, 09:15 AM

Erel,
The application which turns on other application at specified time is also an application!
That means, when the device is turned off, this "Hardware.RunAppAtTime" is stopped as well.
So?

Erel · #8 (**permalink**) 10-07-2007, 10:10 AM

No. Hardware.RunAppAtTime uses the OS notification system to wake up the device.

eddy_ys · #9 (**permalink**) 10-07-2007, 10:15 AM

Erel,
Please have a look at my program.
I activate the "Hardware1.RunAppAtTime" based on Timer1_Tick.
Soon after I run the program, I switch off the device (Not to power off ya..)
Then I wait, but the
Hardware1.RunAppAtTime(AppPath & "\TurnOtherAppON.exe", x)
never turns on the TurnOtherAppON.exe.

What is the best sub to put the Hardware1.RunAppAtTime?
Should it be at the APP_START?

Please enlighten!

Sub Globals
End Sub
Sub App_Start
AddForm("Form1","Form1")
Form1.Show
Hardware.New1
AddTimer("Timer1")
Timer1.Enabled = True
Timer1.Interval = 60000
AddTimer("Timer2")
Timer2.Enabled = True
Timer2.Interval = 1000
End Sub
Sub Timer1_Tick
x = TimeParse("17:10")
x = DateAdd(t,0,0,0)
Hardware1.RunAppAtTime(AppPath & "\TurnOtherAppON.exe", x)
End Sub
Sub Timer2_Tick
Sound("tick.wav")
End Sub

Erel · #10 (**permalink**) 10-07-2007, 10:17 AM

What is the meaning of:

Code:

    x = TimeParse("17:10")
x = DateAdd(t,0,0,0)