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Build a data logger with the Raspberry Pi and the DHT11/DHT22 sensor that automatically stores data on temperature and humidity and a timestamp on a .txt file. 
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Learn how to interface the DHT11 and DHT22 digital temperature sensors with the Raspberry Pi to get temperature and humidity readings. You’ll learn how to connect the sensors to the Raspberry Pi, include the required libraries, and write a Python script that displays the current temperature and humidity on the shell/terminal.
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Humidity, Temperature and Pressure are three important environmental parameters to decide the weather conditions of a particular location. So in this DIY IoT project session, we are making a Raspberry Pi weather station using DHT11 and BMP180 sensors. Where the DHT11 sensor senses the temperature and humidity while BMP180 sensor calculates the pressure. In our previous project, we have used the DHT11 sensor to detect temperature and humidity, and now in this project, we are adding another sensor to make a complete weather station using Raspberry Pi. Further, we are sending the weather station data to ThingSpeak for live monitoring from anywhere in the world, and we can view the logged data and graph over time on the website. You can also choose any other IoT platform to monitor the real-time data.
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DHT11 (Raspberry Pi): How to setup a DHT11 sensor to read Temperature and Relative Humidity on the Raspberry Pi.
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In this tutorial, we will be showing you how to use the DHT11 Humidity and Temperature sensor with your Raspberry Pi.
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From
peppe8o
Getting environment conditions is the first and simpler task required to create more complex electronic automations. Raspberry PI with DHT11 sensor can get tempreature and humidity values with cheap pieces
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Earlier we have setup the Cayenne with Raspberry Pi and controlled a LED using Cayenne Dashboard. Here, in this project we are going to monitor the temperature and humidity data over the Cayenne dashboard using DHT11 with Raspberry Pi. To publish data to Cayenne dashboard python MQTT library will be used and to read data from DHT11 sensor Adafruit DHT sensor library will be used.
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Temperature and Humidity are the most common parameters that are being monitored in any environment. There are tons of sensors to choose from for measuring temperature and humidity, but the most used one is the DHT11 due to its decent measuring range and accuracy. It also works with one pin communication and hence is very easy to interface with Microcontrollers or Microprocessors. In this tutorial we are going to learn how to interface the popular DHT11 sensor with Raspberry Pi and display the value of temperature and humidity on a 16x2 LCD screen. We already used it to build IoT Raspberry Pi Weather Station.
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