GPS controlled actuator

Projects General Guidance
1

Hi, I'm trying to scope out a project as follows:

User enters a distance in metres on a keypad (typically 5 to 20m).
Preset distance is displayed on a readout (7 segment digital display is fine)
User starts moving (walking speed or a little quicker), display counts down to zero metres.
After the preset travel distance is reached a 1 second pulse output signal activates a relay or actuator (need 12V and probably 2 Amps)
Pulse stops and user continues to move until the next interval is reached.
GPS needs to be accurate within 0.5m

I can see a project where a GPS chip is hooked up to an Arduino, but I don't know what I should be looking at in terms of outputs. Is this achievable please? Whats a good starting point?

Many thanks

2

largechris:
GPS needs to be accurate within 0.5m

Is this achievable please?

Yes, you need to use differential type GPS systems.

You will need a budget into the 100s of $, see examples;

https://www.ja-gps.com.au/DGPS/DGPS-and-RTK-Hardware

Standard GPSs, the type commonly used wirth Arduinos, have a typical accuracy in the 3m to 10m range.

3

Ah Ok, that's fine, a better GPS system is a prerequisite then.
Can I use the feed from a differential GPS to input into an Arduino please? Is it likely to be the same data format as a standard arduino type GPS?

4

NEO8-M is told, in the data sheet, to have a resolution of 2.5 meters.

5

Most all GPS units for output standard NMEA sentences. Some GPS libraries let you choose which sentences are displayed. Or you can parse the data that you want on your own.

6

groundFungus:
Most all GPS units for output standard NMEA sentences. Some GPS libraries let you choose which sentences are displayed. Or you can parse the data that you want on your own.

That's helpful thanks. Apart from the differential GPS and arduino board, what other components do I need, how to people normally trigger a 12V 2Amp output?

7

largechris:
how to people normally trigger a 12V 2Amp output?

Relay, or MOSFET.

8

A relay needs to be a relay module.
A MOSFET requires a gate resistor in serie.
If the load is inductive, use a kicj back diide across the load.

9

A relay needs to be a relay module.
A MOSFET requires a gate resistor in serie.
If the load is inductive, use a kick back diode across the load.

10

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