In this video, I’ll show you how I built a highly sensitive homemade aneroid barometer using simple materials — a 2L glass jar, balloon diaphragm, and a laser module!I combined optics and electronics to detect small changes in atmospheric pressure. Here’s how it works:
A laser diode is mounted on the balloon diaphragm. As air pressure changes, the diaphragm moves, causing the laser beam to shift.
The beam is directed toward an LDR-based sensor circuit (using a BC547 transistor, 1k resistor, buzzer, and LED). If the laser moves off the LDR due to pressure change, the LED and buzzer turn on!
A 30 cm scale is used to visually observe tiny laser movements from a distance of 40 cm — allowing you to track even minute pressure fluctuations.
This setup mimics how a real aneroid barometer works, but adds a modern twist with laser detection and audio-visual alerts.
Materials Used:
2L Glass Jar
Balloon
Laser Diode Module (3.7V)
LDR (Light Dependent Resistor)
BC547 Transistor
1K Resistor
Buzzer and LED
Ruler or scale (30 cm)
Perfect for science projects, weather experiments, or DIY electronics enthusiasts!
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#DIYBarometer #LaserSensor #BC547Project #WeatherStation #HomemadeBarometer #ElectronicsProject #ScienceExperiment #BarometerDIY
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