I was playing with a laser cutter lately and this is the outcome. A robotic lamp that follows your movements with an optical flow sensor from a computer mouse and an ATMega 328.
I’ll release the files and schematics when I’ve fixed a few mechanical bugs.
Heres a video: https://vine.co/v/bUzYzEmiKLK
A nice little appliance that displays up to 8 different metrics. Powered by a Raspberry Pi.
This is a cheap electronic name badge that can be programmed with the arduino ide. I built it for events like barcamps at the attraktor makerspace.
Q:Great work with the RFM12B, looking forward to trying this out on the RaspberryPi. Are you aware that the SPI bus now has drivers on Pi ? I assume this will help bit rate ?
Yes, I got my Pi last week and I’m working on it. SPI works great but I’m still missing interrupt support for the gpio pins. I guess it will be in the stock kernel when I’m done - I want to add a web interface for configuring the nodes and sending data to/from them and that will take some time :)
Printing a molecule - Part 2
I finally found the patience to finish this.
Because of the very unregular stucture i had to added some support structure to the print. That means that the overhanging parts are supported by a grid of extruded plastic that is extruded at lower speeds.
The printing process:
All the parts with a grid-like structure are support material.
Connecting microcontroller projects to the internet - the cheap way
There are a few options to connect an arduino to the internet. Unfortunately most of them are pretty expensive.
You can get an arduino board with built-in ethernet or attach an ethernet shield to a standard arduino board. These will cost about 40 euros and you’ll have ethernet cables lying around. There are also WiFi shields but these start at about 60 euros for the shield alone. Also these add significantly to the project’s power consumption
A cheap and easy solution for adding wireless communication to an arduino is the 868Mhz HopeRF RFM12 wireless radio module. These transceivers are about 4 euros and there are very nice arduino clones that have them built in from JeeLabs. The range is about 100 meters indoors and up to 300 meters outdoors.