June 2015
Intermediate to advanced
464 pages
12h 3m
German
Content preview from Raspberry Pi programmieren mit Python
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Kapitel 9: Sensortechnik
Über den GPIO kann man externe Sensoren, wie z. B. Temperatursensoren an den RPi anschließen. Dabei gibt es drei technische Herausforderungen:
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Ein physikalisches Phänomen (wie z. B. eine Temperatur) muss durch ein analoges elektrisches Signal (eine Spannung) abgebildet werden. Das leistet ein Sensor.
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Der analoge Spannungswert muss in einen digitalen Wert, eine Zahl überführt werden. Das macht ein Analog-Digital-Wandler wie der MCP3008.
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Der digitale Wert muss über Kabel an den RPi übertragen werden. Dafür bietet der RPi zwei Bussysteme: einen 1-Wire-Bus, der mit einer einzigen Datenleitung auskommt, und einen SPI-Bus, der vier Leitungen benötigt.
Diese Techniken werden in diesem Kapitel im Rahmen abgeschlossener ...
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