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Compass is a necessity for many campers or adventurers, but it has its limits such as it can’t be clearly read in the dark. Although fluorescent compass can play its role in darkness, it could not last long since it mainly relies on fluorescence.

To solve the problem that troubles many people, we plan to make a compass that could show the direction clearly in the dark and there are two plans: 1. use magnetometer with Arduino as the central control, then lights in different color will come out to simulate the function of compass; 2. put a transparent compass in front of a flashlight, the compass will show its effect when the flashlight is on.

It is easy to see that plan 1 has better visual effect, but the materials seem to outweigh its value in use; while plan 2 can be made with very simple materials in just a few steps. To conclude, plan 2 has higher value in use and is easier to be made, so plan 2 suits better.

The product has the following advantages:
(1) it solves the problem that compass could not be clearly read in the dark

(2) very easy to DIY

(3) handy and portable

(4) low cost.

Materials needed: a usable flashlight, a compass, a bottle of sewing machine oil, hammer, tweezers and some other tools, a glue gun.

Step 1: Step 1: Preparation

Fix a thin and short needle head on the center of the round transparent plastic plate (vessel lid);

Fill the unsealed round transparent plastic vessel (vessel body) with sewing machine oil;

Take the magnet out of the abandoned compass and mark the positive pole.

Step 2: Step 2: DIY Transparent Compass

Put the magnet inside the vessel body and cover it with vessel lid, then use the glue gun to glue the vessel lid and body. A transparent compass is ready.

Step 3: Step 3: DIY Compass Flashlight

Use the glue gun to glue the transparent compass onto the flashlight. A compass flashlight is finished.

Step 4: Step 4: Effect Display

1. Put the compass flashlight with a 60°~90°angle with the ground;

2. The compass pointer could move to the right position within 3 seconds;

3. The shadowed direction deviates the calibration direction within ±5°.

<p>Surely the torch and battery introduce a large amount of deviation to the small compass? </p>
<p>First, I'm glad to here about your advice.</p><p>Second, we've thought about this problem before begining this project. Evperient had proved that torch and battery just bring a little amount of deviation&mdash;&mdash;0.27 second and 3 degrees based on prefect compass. Of course, this does not prove to be a problem.</p>
<p>Clever!</p>

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