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# Building a Sensor to Measure Weight, using a Potential Divider and Wheatstone Bridge.

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Introduction

Building a Sensor to Measure Weight, using a Potential Divider and Wheatstone Bridge. Initial Ideas: Firstly I needed to have an idea of what I would have liked to investigate about sensors, whether it be to evaluate against a ready-made sensor or to build and calibrate a sensor. I decided on building and calibrating a sensor as I feel it would be more creative. Then I brainstormed a couple of ideas to build, for example measuring the speed of water by measuring the time it takes the water to fill a cup, so increasing its weight. Another idea was to build an accurate weighing device that works in two directions, the first the conventional way using gravity and the other using a pulley system to measure the upward pulling force. I chose the second idea as I felt the first idea would be to long an experiment as it involves more stages of planning. The first idea is very similar as it also measures weight, but has a different specification. In my primary thinking I realised using a potential divider to measure the weight would be accurate and make it easier to involve equipment we have been shown. The first piece of equipment I thought would be a useful item to use was the strain gauge. These measure the strain on a material, in this case a hacksaw blade. The gauge is on top of the blade and when it is bent down the resistance of the gauge increases, where it is bent up it decreases in resistance. I now have my idea and the specific apparatus I need to start planning the experiment. ...read more.

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