Volume III of the Forrest Mims Engineer's Mini Notebook series includes 3 of his best selling notebooks devoted to sensors: Sensor Projects; Solar Cell Projects; and Magnet & Magnet Sensor Projects. Electronic sensors convert light, temperature, sound, magnetic fields, and other signals into a form that can be processed by electronic circuits. Sensors have become an increasingly-important segment of modern electronics. Learn about important sensors like solar cells, photoresistors, thermistors, hall-effect devices, and magnet switches. Then use these sensors to build circuits and projects that respond to heat, pressure, light, touch, water, strain, lightning and magnets. You can even make a circuit that detects the presence of the cursor on your computer screen and the position of a compass needle. Build projects that detect: Moving Air Tilt Pressure Direction Heat Vibration Movement Strain Light Magnetic Fields Use sensors to: Trigger Relays Charge Batteries Measure Light Control a Tone Monitor Your PC.