radioactivity – Geiger-Muller
visitors this year: 32 Uses a separate Geiger probe to measure radioactive counts or count rate. Most useful are those that show the count rate at a point in time – with a fast...
position or angle sensor
visitors this year: 69 This sensor allows superb and easy to do investigations into the swing of a pendulum leading on to studies of harmonic motion and damping. (See several examples nearby). It allows...
oxygen and pH sensors
visitors this year: 61 oxygen sensor Sensor is used in conjunction with an oxygen electrode. Good for demonstrations where you monitor photosynthesis, fermentation or where you re-breathe the air in plastic bag. Before you...
humidity sensor
visitors this year: 45 A less widely used sensor that nevertheless shows interesting results when monitoring environments over time. Place one in a polythene bag with your hand, or a plant and see how...
conductivity sensor
visitors this year: 36 This sensor is used in conjunction with a conductivity cell. It tends to used as a stand-alone meter to measure salinity or total dissolved solids in water. Offers some enhancement...
balance sensor
visitors this year: 28 Balances and interfaces have for a long time tried to find a common language for talking to each other. A few systems found this and offered a balance adapter that...
pressure sensor
visitors this year: 37 A surprisingly useful sensor which is usually on the expensive side. They come in various ranges and while no single range handles all uses you can settle on a mid...
breathing sensor, ecg & pulse
visitors this year: 41 A dedicated device that shows the breathing rate or in some designs, the breathing movements. The latter types are more interesting as they show the depth of breathing too. However,...
sound sensor & microphone
visitors this year: 57 sound sensor Sound sensors tend to find their use as stand alone noise meters but this misses some interesting uses where sound level changes over time. Just using it as...
light sensor & colorimeter
visitors this year: 127 Often used elaborately to produce a makeshift colorimeter, the light is very useful for many biology and chemistry experiments on rates of reactions. As monochromatic light is less important with...
heat flow sensor
visitors this year: 41 Used to measure the flow and direction of heat through clothing or building materials. It contains countless thermistors and unlike a temperature sensor, provides readings as Watts/m2. While its classroom...
distance sensor or sonar ranger
visitors this year: 69 These distance or motion sensors use sound reflected from an object to detect changes in its position. Most designs were based on the sensor developed as the range finder for...
accelerometer, dynamics pulley
visitors this year: 92 Accelerometers contain the tiny chip sensors often used as triggers for car air bags. You can take one of these sensors into a lift, fix one to a dynamics trolley...
light gates and switches
visitors this year: 176 These are digital switches that record a time when triggered by say, a dynamics trolley or a card. When you enter parameters like distance or mass into the software, velocity,...
