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Arduino Project Handbook by Mark Geddes

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PROJECT 5: PLANT MONITOR

IN THIS PROJECT I’LL INTRODUCE A NEW TYPE OF ANALOG SENSOR THAT DETECTS MOISTURE LEVELS. YOU’LL SET UP A LIGHT AND SOUND ALARM SYSTEM TO TELL YOU WHEN YOUR PLANT NEEDS WATERING.

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PARTS REQUIRED

• Arduino board

• Jumper wires

• LED

• HL-69 hygrometer soil moisture sensor

• Piezo buzzer

HOW IT WORKS

You’ll use an HL-69 moisture sensor, readily available online for a few dollars or from some of the retailers listed in Appendix A. The prongs of the sensor detect the moisture level in the surrounding soil by passing current ...

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