DIYIAQHow-To
DIY: Turn an Old Smartphone or Cheap Speaker into a Low-Cost IAQ Monitor or White Noise Machine
aaircooler
2026-02-12
10 min read
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Repurpose old smartphones and cheap Bluetooth speakers into CO2/humidity monitors and scheduled white-noise machines. Practical, low-cost DIY IAQ hacks.
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#DIY#IAQ#How-To
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