They worked throughout the 1900s on what was to become their groundbreaking "Principia Mathematica". Near the end of 1900, after learning about the work done on the foundations of mathematics by the Italian mathematician Giuseppe Peano (1858 - 1932) at the 1900 International Congress of Mathematicians in Paris, Whitehead and Russell began to collaborate. He had become interested in pure mathematics and he started work on the "Treatise on Universal Algebra" in 1891, with Evelyn's encouragement, just weeks after his marriage (the work would take him seven years to complete, and was finally published in 1898).Īlthough his father was an Anglican vicar and he had been brought up as an Anglican, he began to move towards the Roman Catholic Church (perhaps due to his wife's influence), although in the end he chose neither and embraced Agnosticism around the mid-1890s (partly in view of the rapid developments in science during that time).īertrand Russell had entered Cambridge in 1890 and, as an examiner for the entrance examinations, Whitehead had immediately spotted Russell's brilliance, and took him on as his student and protegé. They were to have a daughter and two sons (one of the sons died in action during World War I). He was promoted to a full lectureship at Trinity in 1888, and took up additional teaching duties by accepting a teaching position at Girton College.Īt the end of 1890, he married Evelyn Wade, an active and outgoing Catholic Irish woman brought up in France. He had also developed a keen interest in physics, and his fellowship dissertation examined James Clerk Maxwell's views on electricity and magnetism. He was elected a Fellow in Mathematics in 1884 and then took up an assistant lectureship to teach applied mathematics. He won a scholarship to Trinity College, Cambridge in 1880, where he studied mathematics. The syllabus was heavy on the classics, but Whitehead excelled in sports and mathematics in particular, and he was Head Boy and Captain of Games in his final year. From 1875, he attended Sherborne Independent School in Dorset, then considered one of the best public schools in the country, and where his oldest brother was a teacher. He was educated at home by his father until he was 14, because his over-protective parents thought that he was too delicate to go to school (in fact his health was quite robust). His family was firmly anchored in the Church of England (his father and uncles were vicars, while his brother would become Bishop of Madras). He was the youngest of four siblings, with two older brothers and an older sister. His father, also named Alfred Whitehead, was an Anglican clergyman his mother was Maria Sarah Buckmaster. Whitehead was born on 15 February 1861 in Ramsgate, Kent, England. He managed to combine a staggering complexity of thought with a literary but very readable quality of writing. In addition he made contributions to algebra, the foundations of mathematics, physics, Philosophy of Science and Philosophy of Education. He also developed a fresh approach to Metaphysics, which he originally called Philosophy of Organism (or Organic Realism) and which has come to be known as Process Philosophy. He is considered one of the founding figures of Analytic Philosophy, and he contributed significantly to 20th Century Logic, especially the new symbolic type of Logic he developed in the epochal "Principia Mathematica", along with co-author Bertrand Russell. Whitehead) (1861 - 1947) was a British mathematician, logician and philosopher. By Individual Philosopher > Alfred North Whitehead
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With the DHT libraries installed, you can connect to the sensor and retrieve temperature and humidity data.Ĭreate a file with: #!/usr/bin/env python3 Sudo pip3 install Adafruit_DHT Get sensor data with Python # Install the Adafruit DHT sensor library Once you've installed the operating system on an SD card and booted the Raspberry Pi from the card, there are only a couple of other software packages to install to interact with the DHT22.įirst, install the Python Preferred Installer Program (pip) with apt-get, and then use pip to install the Adafruit DHT sensor library for Python to interact with the DHT22 sensor. I am using Raspberry Pi OS Lite, released May 7, 2021, as the image for the Raspberry Pi Zero W. If not, consult my article about customizing different operating system images for Raspberry Pi. (Copyright © 2021 Matt Hawkins) Install the DHT sensor softwareīefore proceeding, make sure you have an operating system installed on the Raspberry Pi Zero W and can connect to it remotely or with a keyboard. This diagram from Raspberry Pi Spy shows the pin layout for the Raspberry Pi Zero W (among others). DHT22 Ground pin Raspberry Pi Group pin (#6).DHT22 Data pin Raspberry Pi GPIO4 pin (#7).DHT22 Positive pin Raspberry Pi GPIO v5 pin (#2).Finally, I connected the Ground pin on the DHT22 to a ground pin on the Raspberry Pi header. I am using GPIO4 for this, but any would work just make a note of the one you choose, as the Python code that reads the data from the sensor will need to know which pin to read from. I connected the Data pin on the DHT22 to one of the Raspberry Pi GPIO pins. The DHT22 runs on 3v-6v, so I selected one of the 5v pins on the Raspberry Pi to provide the power. The Positive pin provides power from the Pi to the DHT22. I used Raspberry Pi Spy's Raspberry Pi GPIO guide to make sure I connected everything correctly. You can wire the DHT22 directly to the Raspberry Pi Zero W. The DHT22 with the PCB attached has three pins: a Positive pin (marked with +), a Data pin, and a Ground pin (marked with -). If you purchase a raw sensor, you'll need a resistor and some soldering skills to get it working (check out Pi My Life Up's DHT22 article for great instructions on working with the raw sensor), but you can also purchase one with a small PCB that includes all that, which is what I did. The DHT22 is a digital sensor, making it easy to interact with. You can find a bunch of inexpensive DHT22 temperature and humidity sensors with a quick web search. Whitepaper: Data-intensive intelligent applications in a hybrid cloud blueprint.eBook: Running Kubernetes on your Raspberry Pi.Getting started with Raspberry Pi cheat sheet. 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