I 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.
Author Archives: daveh
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.
IN October 2015, we had the launch event for the “Lightning Dress”, a garment we’ve been working on as a group in the local Fablab for the last 6 months. It’s got approx. 700 RGB leds, all individually addressable, so it gives great flexibility for generating interesting patterns and effects.
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Over 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.
I 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
I 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 »
The Raspberry Pi foundation announced it’s latest member of the Raspberry Pi family, the Model A+. This is a departure from the usual credit card form factor, in that they’ve managed to knock off 20mm from the length, resulting in a very nice 65x56mm form factor.
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.
Recently I took delivery of an Intel Edison with a Mini-Breakout Board. I was awestruck by the size of the thing, but it was not until I started using it properly for a couple of projects that I noticed that it seemed a little bit ‘snappier’ than boards I’d used in the past (Raspberry Pi, Beaglebone Black). So I decided to do a little benchmarking.