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…
Not long ago, I picked up an old point-of-sale terminal at an electronics surplus store. After discovering a cool little Z-80 based computer inside, and reverse-engineering the hardware, I decided to reprogram it to unlock the music hidden inside magnetic…
I’ve finally made some visible progress in turning this Tranz 330 point-of-sale terminal into a general purpose Z-80 computer. It prints my name on the display! I may faint from the excitement. OK, it’s not much to look at yet,…
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