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Multiplexing Raspberry Pi cameras

Raspberry Pi camera module has pretty good characteristics and with software support you can do lots of interesting stuff. This is OK until you need more than one camera. What if you need more than one camera? There can be few solutions to problem – use another Pi per camera and join them with some webserver, use USB based webcams or try thing differently and multiplex multiple cameras to this single CSI connector. IVPort selected third option where he build camera interface multiplex module. Multiplex module is designed as stack-able, so you can connect 4 cameras with single module and 3 GPIO control pins, 8 cameras with two modules that require 5 control pins and max of 16 cameras with 9 control pins. Of course cameras aren’t displaying all at… Continue reading

Tweeting weather data with Raspberry Pi

Raspberry is a great small Linux machine which is ideal for connecting things to internet. Bunch of O/I pins allow connecting peripherals and sensors that can be accessed via web interface. Ferran Fabregas has been building a weather station with Raspberry Pi which sends data using Twitter application. Currently his set up reads temperature and humidity data from DHT11 sensor and light intensity with LDR photocell. Raspberry Pi runs a python script which takes care of reading data from sensors. He also runs a local webserver where data can be loaded in nice graphical format which is updated in real time. Continue reading

Raspberry Pi based traffic monitor

When you live in a city, then you know that traffic is one of the biggest problems to face with. If you want to get from point A to B you can find yourself struggling when finding optimal route where traffic is minimal. Luckily there are websites that provide such information. But how to get it while you are driving? J3stream decided to build traffic monitor by using Raspberry Pi and LCD. He purchases an LCD for Raspberry Pi on eBay. Since data is displayed on website, he used cheap WiFi USB dongle which connects to hotspot. If there is no WiFi available, data can be routed from cell phone which is configured as connection point. He also constructed a suction based mechanical attachment to windshield and connected car power… Continue reading

Using real tachometer to display CPU usage

Very often analog gauges are used to measure some rate parameters. In most cases they are based on voltmeters where needle position is driven with PWM signal. Pat found a tachometer from old car lying around and decided to use it for displaying something useful – CPU usage. He starter building this project on Raspberry where tachometer would display its CPU usage. First of all he had to figure out the signals needed to drive tachometer from 0 to full scale. He found a table with frequencies and PWM values on Tekronix 3252 information site. Then another issue was the signal level. Tachometer needs 5V to drive it while Raspberry Pi signal level is 3.3V, he used 7404 buffer to bring that level. The rest is Python code running on… Continue reading

Building full HD IP Cam out of Raspberry PI

If you will start looking good for IP camera, you will see that they cost decent amount of cash. If you are looking to use one for your own needs like home security or office monitoring, then look around if you have spare Raspberry Pi and camera module. These things are cheap. Antoine likes to have control over things, so he started an Open Source project where he builds FULL HD (1080p) IP cam that can stream video at 30fps. It sends standard H.264 encoded video over RTSP protocol which is used in security applications. As camera housing he used standard camera dome that can be found on eBay. To power the Raspberry, he implemented simplified PoE (Power Over Ethernet) on two twisted pairs from DC power adapter. The software… Continue reading

Nixie calculator powered by Raspberry Pi

This is some nice calculator which is grate from all aspects. But probably coolest thing here that retro looking Nixie display and old style keyboard keys are fused with modern electronics such as Raspberry Pi. Raspberry Pi is definitely an overkill for such calculator, but since these things are getting cheaper and cheaper, so why not? To use a bit more of Raspberry Pi power Scott made it internet connected calculator where you can send calculations to WolframAlpha. All parts of calculator is custom made where each nixie tube is controlled by K155D driver chip. Each chip is controlled through I2C IO expander that is connected to Raspberry Pi. Custom power supply board takes care of powering computer with 5V and tubes with high voltage. I’d say this is quite… Continue reading