A sleuth pursues a mysterious Rascal 2 bug

The upper deck on the Rascal 2 will have a Freescale Kinetis MK20 processor on it, so it can act like a Arduino, or a Teensy 3.1, or a Fadecandy. (The Teensy 3.1 uses the same chip, and the Fadecandy is almost identical, but with slightly less memory.…

Building the Rascalfarm

Working with embedded Linux boards like the Raspberry Pi, or Beaglebone, you will fairly quickly realize that the hardware is far more polished than the software. It's not too surprising-- the boards are sold with the expectation that you will program the board to make it do what you want.…

Rascal 2: second prototype

Most of my time in the last few months has been devoted to developing the radiation monitoring system mentioned in the last post, but in the gaps, I've made some progress on the Rascal 2. The image below shows what is mostly a mechanical prototype. The bottom PCB is nearly…

Rascal 2 prototype: first look

There's been radio silence over here at Rascal Micro headquarters for the last few months because of three all-consuming projects: The new design for the Rascal 2. A radiation monitoring system for a lab at the University of Texas. My wife and I have a rather young daughter. It is…

First iteration of OSHW stencil printer complete

(Background: I'm building a manual stencil printer for applying solder paste to circuit boards. The hardware design will be open source. There are more details in the first post about my stencil printer.) After a couple of failed mechanism designs, the first working iteration of my open source hardware stencil…

Stenciling PCBs on my desk

I try to assemble as many Rascal Micro products as I can myself here in Somerville. The Rascal itself has a ball-grid array processor, which is really hard to assemble reliably by hand, but simpler stuff I can handle. For my Precision Voltage Shield, I assembled the first one by…