By Kimmo Karvinen
To construct digital tasks which can experience the actual global, you must construct circuits established round sensors: digital elements that react to actual phenomena through sending an electric sign. regardless of in simple terms simple digital elements, you could construct beneficial and academic sensor tasks. but when you comprise Arduino or Raspberry Pi into your venture, you could construct even more subtle tasks which could react in attention-grabbing methods or even hook up with the web. This ebook starts off by means of instructing you the fundamental digital circuits to learn and react to a sensor. It then is going directly to convey the way to use Arduino to improve sensor platforms, and wraps up via educating you the way to construct sensor tasks with the Linux-powered Raspberry Pi.
Read Online or Download Make: Getting Started with Sensors: Measure the World with Electronics, Arduino, and Raspberry Pi PDF
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Example text
It has two conductive plates, separated by an insulator. Even the symbol for a capacitor shows this: two lines for the metal plates are separated by a gap. Figure 2-16. Three capacitors Figure 2-17. Symbol for capacitor Capacitors are used in resonant circuits, like in radios. , in the circuitry of an Arduino board). Yet another use is timing events, which is the usage you just worked with in the last project. The capacitor and resistor you hook up to the 555 timer configure its mode. The values also further affect the specific expression of the configured mode and allow us to make determinations about the overall circuit.
Completed firefly Once the circuit is ready, try it out. Cover the LDR with your finger, and the LED gradually lights up, then dims, then lights up again. Point a flashlight at the LDR, and the LED turns off. Troubleshooting If this project doesn’t work, try checking the following things: • Double-check the connections. info • Test your LED and battery the way you learned at the beginning of this chapter. • If you can’t find out what’s wrong, try the pulsating and photoresistor circuits separately again.
What happens when you make a shadow or hide the photoresistor completely? Most common sensors are analog resistance sensors, so they use a variation of this same connection. You can apply this same approach to similar sensors you meet in the future. Project 10: FlexiForce to Measure Pressure A force-sensitive resistor such as the FlexiForce (see Figure 3-14) is a flat sensor that measures how much pressure you exert on it. Untouched, without any pressure, it has a very high resistance. When you press the round area at the end of the sensor, the resistance drops and it becomes more conductive.