Inspired by seeing Xmas-themed-PCBs all over Twitter, an idea popped into my head. Two days later, I’d sent off a new PCB for manufacture.(more…)
In previous posts I’ve talked about some of the difficulties I’ve had converting vector drawings to PCB layouts in Eagle. After discovering a video by Twinkle Twinkie where he shows off his workflow I thought I’d follow along and see what came out. The result is the Skeletor “Myah!” badge.(more…)
Just in time for the weekend all the parts for version 2 of my Clamps badge arrived!
Here’s a look at the bare PCB from OSHPark – annoyingly I had issues with the front ENIG finish on two of the badges, and the front soldermask on all three to varying degrees. OSHPark have sent some replacements off for fabrication but I decided to press ahead with the best of the bunch.(more…)
After my first batch of Clamps badges sold out on Tindie, I was lamenting that I didn’t have any spare boards to put rainbow LEDs in. Jon Raymond suggested that I could go one step further and add an ATtiny85 and some RGB LEDs. Not one to turn down a challenge, I started work!
This is the second part of a series investigating the use of optical sensors for robot odometry.
In part one of this project I pulled apart an old Microsoft Intellimouse for the optical chip and managed to extract some readings using an Arduino Uno. The aim now is to repackage those components in a way that they could be mounted underneath a small wheeled robot. (more…)
For the last few years I’ve taken part in the local Rampaging Chariots competition along with a group of graduates. One of our most recent challenges has been to get a rover to autonomously navigate the assigned assault course. So lately I’ve been thinking a lot about odometry, that is, estimating the position of a robot over time. Typically, a cheap method of tracking the position of a rover is by attaching rotary encoders to the output shaft of the drive wheels. Unfortunately as the traction of the drive wheels isn’t perfect, they will slip occasionally and introduce errors into the estimated position.