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Last active February 26, 2026 10:11
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BOM.md

Indoor Air Quality Monitor

All choices listed in preference order.

MCU

Seed Studio XIAO Plus — ~$9

Battery

  1. 602525 3.7V 4-500mAh

Screen

E-paper 1.54" square, 200×200 px, SSD1681 controller, SPI interface.

  1. Waveshare 1.54" V2 — ~$6
  2. Good Display GDEY0154D67 — ~$5
  3. BuyDisplay ER-EPD0154-2B — ~$4

Sensors

CO₂ (NDIR)

Sensirion SCD41 — $20

Temperature and Humidity

BME280 - ~$4

Ambient Light

  1. TI OPT3001DNPR — $3
  2. Vishay VEML7700 — $2

Ambient Noise (PDM MEMS Microphone)

  1. Knowles SPK0641HT4H-1 — ~$2
  2. ST MP34DT06J — ~$2
  3. Knowles SPH0641LM4H-1 — ~$2
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