Q1) Wotzit?
A1) A temperature and humidity sensor toy for small humans. My small human is in a space phase. Last birthday they got a space suit with helmet costume ($25 on Amazon!) and a rocket-ship play tent (Also concerningly inexpensive!). But, as any parental units doomed to watch space-themed childrens programming ad nauseam knows, you can't explore space without a "scanner!"
Q2) Requirements?
A2) Must hold the attention of a small child. Preferably across multiple minutes.
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Brightly colored buttons. Adults should want to push them.
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Highly visible display, should support animations.
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Must at a minimum beep and boop.
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Do something "real," sensor-wise.
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Fit in one of these project boxes I accidentally ordered way too many of.
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Battery powered, charge via USB.
Q3) What's the BOM looking like?
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I don't know, let's see what my parts box is looking like!
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Elegoo Nano. ATMega328p, 16mHz, 2k SRAM, 32k flash. Good 'nuff!
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Sparkfun SparkX Qwiic Alphanumeric Display. 14-segment, single decimal point. No idea what I got these for but they're pretty!
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12mm mushroom looking buttons. Red, yellow, green. Not the highest quality but satisfying to push.
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A lazily calculated low-pass filter.
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Adafruit 2.5W Class D amp. PAM8302A.
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13mm surface transducer.
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2200uF big-arse decoupling capacitor; both the amp and 14-segment can droop the voltage.
Q4) Demo!
A4)
