A speedometer is vital in cars and other vehicles to inform you of exactly how fast you are traveling. Sometimes, one of these instruments can become faulty or be in need of repair or even replacement. With a GPS device, tools and some nifty skill, you can build your very own car speedometer.
Plug your GPS module directly into the Package tracker and insert the MicroSD card into the socket in the 5-volt step-up board.
2
Use a soldering iron to solder the female and male headers of the LCD backpack into the graphic LCD board, and then plug them in. Use power directly from the battery to the 5-volt step-up board, then connect the 5-volt directly into the output of the serial graphic backpack.
3
Decide how large to make the circular shape for the speed indicator, and then draw the digital speedometer on the serial graphic backpack. Add the numerical values in increments of 10 in a clockwise direction, starting with the 0 at the bottom left of the circle.
4
Use a calculator to figure out the coordinates of the line that indicates your speed while driving. Make the line about 20 pixels long and start it from the center of the circle in the speedometer. You can also use the "Line" command on the serial backpack to get your line speed indicator.
Tips & Warnings
Get the speed from your GPS module and post it to the LCD, utilizing the "Speed" command.
Be sure to figure out your speed ratio when setting up your new speedometer by using a scientific calculator. It is much easier to making an error when you try to calculate by hand or in your head.
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