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Using 32.768khz crystal

Toyman 18 Oct 2016, 20:15 last edited by Toyman 18 Oct 2016, 20:16

What do I need to be able to use the crystal with Mysensors apart from soldering it?
I've seen many pcbs featured at openhardware.io have this option, But haven't found examples how to implement it in the code.
I assume I'll also need to set the fuses to use "low freq ext oscillator", correct?
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@eiten I haven't yet made any progress on finding a good VOC sensor, but along the way I did find out something interesting regarding CO2: namely, if you sleep with your bedroom door closed at night, then the odds are good that the CO2 levels rise to surprisingly high and unhealthy levels. The better CO2 sensors are factory calibrated and never again need recalibration for the life of the sensor (usually around 10 years or so), because they are used in HVAC systems to control fresh air intake to guarantee indoor air quality. As a for instance, here is one such CO2 sensor: https://www.digikey.com/en/products/detail/senseair/006-0-0008/15790694 At around $50 for just the sensor element itself, it's not exactly cheap, but then again, I'd say it's worth it, because who wants to be burdened by remembering to calibrate their CO2 sensors? Ideally, I'd like to find a sensitive VOC sensor that also will never require calibration. Nearly all, and maybe all, of the off-the-shelf IAQ montoring stuff that you might buy for, say, $300 or less seems to require periodic calibration. For that reason, this might be one of those occasions where build is rather than buy.
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Just wanted to say thanks for this, it is still relevant and useful six years later !
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Using 32.768khz crystal

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