Imagine that you wanted to start making a new orienteering map, and wanted to use an old map or image as a basis. Here’s one way to achieve that.

We’ll use Open Orienteering Mapper for the project, and some reference points from Open Street Map.

The process we’ll be following is:

  • Starting a new project
  • Getting reference data and loading it as map templates
  • Loading an old map as a template
  • Adjusting the old map template to align with the new project’s co-ordinate system.

The result will be a geo-referenced template, ready to serve as the background image for a new orienteering map. …


This article, part of the Arduino Radio Control Model Plane Altitude Hold series, describes dealing with jitter in the altitude readings.

Even when the altimeter is motionless, successive readings can differ from each other. I’ve observed readings moving by +/- 3 metres. This jitter in the indicated altitude could cause problems for the altitude hold device.

To assess the jitter in my prototype device, I took it for a walk up and down a small slope, then back to the middle of the slope. …


This article, part of the Arduino Radio Control Model Plane Altitude Hold series, describes sending radio control signals from the Arduino to the aircraft controls.

The Servo library does all the work for us. We just invoke it, create servo objects, link them to some Arduino pins, and then determine the size of the pulses to send.

The servos are connected to +5V, GROUND and to a Arduino pin for the signal data. We could have connected an electronic speed control to the throttle pin, but since this is just an illustration, connecting a servo instead still meets our purpose.

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Here’s a program to demonstrate control of two servos. …

About

Greg Wilson

Hopeless at orienteering, rubbish at flying radio controlled planes, but enjoys both activities anyway.

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