Complete Rascal development kit with 4 GB memory card and power supply
The Rascal is a small, open-source computer designed for connecting sensors, motors, and whatever else you can build to the internet. It's about 5 cm x 10 cm (2 inches by 4 inches).
The fourth production batch of Rascals is now up for sale. These are the second run of hardware version 1.3, which is nearly identical to version 1.2, but some of the capacitor footprints were modified slightly to prevent solder bridging. These Rascals ship with the new Cooties software release.
Now $50 off (25% discount), until this batch is gone!
Precision voltage shield
The precision voltage shield is an 8-channel analog-to-digital converter that plugs into Arduinos, Rascals, and anything else with Arduino headers. (Running it with the Arduino Mega requires adding a few jumper wires, but it works.)
The software to run the shield on an Arduino, written by Brandon Stafford of Rascal Micro, is available for free under a BSD open source license. You are welcome to use the code for whatever purpose you like-- use it in your own projects, sell it in a product, whatever you like. At present, the shield can measure 8 channels at 735 Hz when plugged into an Arduino Uno loaded with the Arduino software.
The shield is based around the Analog Devices AD7606 chip. The resolution of each channel is 0.15 mV, which is better than most commercial multimeters.
More details about the development of the shield software and the shield's specifications can be found on the Precision Voltage Shield's documentation page.
PCB only for Precision Voltage Shield
Just the PCB for the Precision Voltage Shield. You'll have to do the soldering yourself. Most of the components are surface mount, which makes it hard, but not impossible, to solder by hand.
Note that assembled shields are also available in the store.
If you don't want a Rascal now, but might want one in the future, sign up for the announcement list (low traffic; you can unsubscribe).