Movement Detection Information System through Gmail @Raspberry_Pi #PiDay « Adafruit Industries – Makers, hackers, artists, designers and engineers!

Movement Detection Information System through Gmail @Raspberry_Pi #PiDay « Adafruit Industries – Makers, hackers, artists, designers and engineers!

Helpful venture + write-up from Antonio Artimon up on

DHT11 Temperature and Humidity sensor :

The DHT11 is a 4-pin (one pin is unused) temperature and humidity sensor able to measuring 20% – 90% relative humidity and 0 to 50 °C. The sensor can function between 3 and 5.5V DC and communicates utilizing its personal proprietary OneWire protocol. This protocol requires very exact timing with a view to get the info from the sensor. The LOW and HIGH bits are coded on the wire by the size of time the sign is HIGH. The full time to take a studying is at most 23.4 ms. This consists of an 18 ms delay required to start out the info switch and a window of as much as 5.4 ms for the info. Particular person alerts will be as quick as 20 μs and so long as 80 μs.

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