Building A Thermostat Using Arduino

This gives an excellent description of the technique. I’ve still yet to determine the switching current, which I’d like to before I build a potentially hazardous item. End goal of this project? Constructing a ‘Nest’-like learning thermostat. Mostly just to predict when I’ll come stomping in from the cold, and adjust the temperature appropriately an hour or two ahead of schedule.

Keeps it toasty.

Teensy (The once and future king) Model 3.0

ImageThis thing is epic embodied. Go ahead and contact Mr. Teensy Himself on Twitter and tell him how appreciative you are. Because it won’t be long before these things are everywhere. With an ARM Cortex-M4 processor and an independent IC for the bootloader, it’s quite resilient to bricking (necessary for me!) native USB, what else is to be expected from PJRC

Oh yeah, and fully working Arduino bootloader and libraries for everyone who doesn’t want to program in C/C++. This is going to be big. Paul claims they easily overclock to 96MHz, and combined with a 32-bit processor, that’s a lot of computing power. Not to mention the 32bit analogWrite() (billions of levels of precision) and 13bit analogRead() (65536 levels of read, or down to a 134uV precision per level. Compare that to a Arduinos’ precision of 19mV, or 4.2mV for the Mega with the 1v1 voltage reference.

So…basically stoked. Get it here for the next day or so.

P.S. Of course, the Kickstarter for this thing was fufilled basically instantly. I mean, we all have the Teensy 2.0, right?

FM RF Data Link

image

In preparation for testing for my technicians class radio license, I’ve been designing a data modem for my avr chips. The current plan is to use a tuned FM transmitter, driven by an op-amp square wave generator, modulated by a microcontroller. This is an improvement (in both power and computational resources) over the original idea of summing sinewaves on the Tx side and Fast Fournier Transform on the Rx side. Seems pretty wasteful, now doesnt it?

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