Encrypted 433MHz links using RFM69’s

IMG_0886bI recently had the need to have a doorbell at the entrance to my property, having recently put in automated gates. I could have run a cable, but I wanted to try out some new 433 MHz transceivers I recently purchased. The entrance would have a push-button switch and the house would have a receiver accepting packets from the entrance.  Once it got a packet, it would trigger a relay to ring the doorbell. The doorbell was an old model, driven by 12V AC, so I thought a relay would be the handiest way to triggger it’s chime. Also, attached to the internal Arduino would be the old doorbell, connected to a gpio input which could also trigger the relay, activating the doorbell. Two methods to chime the same doorbell.

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Add 3 USB ports and an Ethernet Port to Intel Edison / Raspberry Pi Zero for $3.20

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I’ve been a user of many Single Board Computers for a while now, and I always like to have the option of plenty of USB ports and and Ethernet port. I recently came across these devices, which combine 3 full-sized USB ports AND an ethernet port in the one device, terminate by a micro USB connector.

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Damp-Pi – Room Moisture Extraction with Raspberry Pi

20150824_165453bOver the last while I’ve been having a problem with excess humidity in the shower rooms. Imagine that, the builder never put in extractor fans when the house was built! Anyway, I could put in those fancy extractor fans with the built in timers or humidity sensors, but I decided to do things the more interesting way, by using a small computer to read the values from a humidity sensor in each room, and based on the readings, turn on the fan until the humidity was reduced to an acceptable level.

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Raspberry Pi 2 Benchmarked

IMG_1343 copyI got myself a new Raspberry Pi 2 Model B this morning. I was intrigued by its quad-core cpu and how it would stack up against the other single board computers that I’ve benchmarked in the past, which were:

  • Raspberry Pi Model B+
  • Beaglebone Black
  • Intel Edison
  • Imagination MIPS Creator CI20

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Creator CI20 Benchmarked

800px-CI20_perspectiveI recently got a MIPS Creator CI20 from the guys at Imagination to play with. So here’s a quick of my first impressions, including a few benchmarks with sysbench. Performance overall was quite good compared to a Raspberry Pi 1 model B+, and even was pretty good compared to an Intel Edison on the CPU benchmark.  Continue reading “Creator CI20 Benchmarked”

First Intel® Edison project – DSLR Camera Controller

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I’ve been working on camera hacks for a couple of year now. It started with the CameraPi, which was a Raspberry Pi mini-computer stuffed into an old battery grip for my Canon 5D Mark II Camera. Then came various variants on that, including a DIY time-lapse rail, the results you can see in the time-lapse section of this website. Theres’ also some water droplet photography, automated focus stacking, and even a bark activated door opener, not to mention the PiPhone.

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