Sometimes it seems like there are a million different LCDs you might use with your microcontroller project, and deciding on one can be hard. Once you’re ready to move beyond a basic text display, you’ll find graphic displays have a…
The Tiny CPU board design is now off to the board house for manufacturing. The three week wait begins. Somewhere during that time, the Backcountry Logger boards should come back too. I selected Seeed Studio’s Fusion PCB service, because it…
Whew! It was a big job, but I finished the Eagle board layout for the new Tiny CPU, using the Max II CPLD. The board is about 4×3 inches, and if your monitor has a typical 72 DPI, then the…
With the Backcountry Data Logger more or less finished (just waiting for the PCB), my thoughts have returned to my neglected Tiny CPU project. I did a huge amount of design work on Tiny CPU about a year ago, finishing…
I just applied 4 years worth of WordPress updates in one go, without making any backups first. What could go wrong?
Hallelujah! After substituting an external 32768 Hz crystal as the timer clock source for my hiking data logger, I’ve reduced the sleep mode (LCD off) supply current to less than 0.01 mA! It’s actually below the resolution of my multimeter– the meter…
In my last post, I described an idea for a hiking data analyzer based around an old cell phone LCD, a pressure/temperature chip, and an ATmega microcontroller. Since then, I’ve received the parts and built a simple demo that exercises…
It’s new project time, and I’ve decided to try my hand at building a data logger/grapher/analyzer for long-distance hikers. In August I’ll be hiking the John Muir Trail, a 211 mile wilderness trail through remote parts of California’s Sierra Nevada mountains. My…
The VeriFone Tranz 330 point of sale terminal and its cousins are great platforms for electronics tinkerers. Commonly available from surplus stores or eBay for around $10, these little boxes contain a complete 8-bit computer, with lots of intersting I/O…
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