Raspberry Pi Roundup - 22nd May 2015

Water

Ismail Uddin over at Science Exposure has created a device that detects movement and then dispenses water. He’s taken a Raspberry Pi, a RaspiRobot board, a peristaltic pump and an SR-04 ultrasonic rangefinder module and put them together. His code and write-up is available on the Science Exposure blog – Read more here.

Motion

Karl Herrick has taken a PIR sensor and hooked it up to his Pi. He’s then used a variety of different software including theCylon.js framework and Node.js to do the detection and provide a web interface for the sensor. It’s an interesting example of using lots of different technology to bring about a result. You can find his code here. Take a look here for more details.

Security

Alex Eames has been busy experimenting with a way to replace an old low-res security camera at his house in Poland. He’s come up with a Pi-controlled, servo-positioned camera that will accept commands over Twitter. The core of the project is a RasPiO Duino board that is connected to an old Raspberry Pi Model B and has an onboard light-dependent resistor and temperature sensor. The board communicates with the Pi over serial and sends these readings back, while at the same time accepting commands (from the Twitter feed) from the Pi to control the servos to position the camera. It’s very neat and tidy, and is an excellent extension on Alex’sprevious blog posts working with the Twitter API. And, oh yeah, it can upload photos and videos to Dropbox in addition to tweeting a photo via a cron job (scheduled task). Read more here. (Photo by Alex Eames)