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Getting to Know Plants (Smart Photosynthesis & Transpiration Lab)

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Enclose a potted plant in a transparent acrylic chamber. A DHT22 humidity sensor tracks leaf transpiration (water vapor release), while an LDR light sensor and CO2 probe demonstrate photosynthesis under different light colors!

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Props & Materials Required

  • •Transparent sealed plant testing chamber with RGB LED growth light
  • •DHT22 temperature & humidity sensor
  • •MH-Z19B NDIR CO2 sensor / LDR light intensity sensor
  • •ESP32 controller board
  • •16x2 LCD display screen
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Seal Plant inside Chamber

Place green leafy plant inside the clear testing chamber.

2

Turn ON Red/Blue Grow Lights

Turn ON RGB grow light to Red spectrum (photosynthesis peak wavelength).

3

Monitor Transpiration Moisture Rise

DHT22 reads chamber humidity rising from 45% → 85% as leaves transpire water!

4

Photosynthesis Report & Audio Tip

LCD displays 'TRANSPIRATION ACTIVE! Humidity: +40% | Stomata Open!'. Speaker narrates how plants pump water up from roots to leaves!

Why It Works & Notes

Plants lose water vapor through stomata (transpiration) and convert CO2 + light into oxygen (photosynthesis). Monitoring chamber humidity rise and CO2 drop under Red/Blue LED grow lights brings plant physiology to life.