{"product_id":"soil-moisture-sensor-kit-diy-light-up-plant-water-indicator-with-led-transistor-resistor-learning-circuit-educational-electronics-kit","title":"Soil Moisture Sensor Kit - DIY Light-Up Plant Water Indicator with LED, Transistor \u0026 Resistor Learning Circuit - Educational Electronics Kit","description":"\u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Lectrify\u003c\/p\u003e\u003cp\u003eBring science to life with this hands-on DIY soil moisture sensor kit that teaches electronics while solving a real problem-knowing exactly when your plants need water. This educational kit lets you build a light-up flower indicator that responds to soil moisture levels. When the soil becomes too dry, the LED lights up, giving you a clear signal to water your plant. Perfect for beginners, students, and hobbyists, this Level 2 kit introduces essential electronics concepts including: - How an NPN transistor works as a switch - Understanding resistors and variable resistance (potentiometer) - Building a voltage divider circuit - Using conductivity to measure soil moisture ?? How It Works The “roots” act as a moisture sensor by measuring resistance in the soil. Wet soil = low resistance ? LED OFF Dry soil = high resistance ? LED ON Use the adjustable dial (potentiometer) to calibrate the moisture level for your specific plant. ?? What’s Included 1 × NPN Transistor 1 × 220? Resistor 1 × 100K Potentiometer 1 × Red LED Circuit board Tools Required (Not Included) Soldering iron Solder wire Wire cutters Phillips screwdriver\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e?? SMART PLANT WATER INDICATOR Build a flower that lights up when your plant needs watering. The LED turns on when soil is dry, helping you keep plants healthy with a fun, visual reminder.\u003c\/li\u003e\n\u003cli\u003e? HANDS-ON STEM LEARNING Learn how transistors, resistors, and voltage dividers work through a real-world project. Perfect introduction to electronics and simple logic circuits.\u003c\/li\u003e\n\u003cli\u003e?? DESIGNED BY EDUCATORS Created by teachers to make electronics approachable and engaging. Ideal for students, beginners, and classroom STEM activities.\u003c\/li\u003e\n\u003cli\u003e? Beginner Electronics \u0026amp; Soldering Practice Perfect for beginners, makers, hobbyists, STEM programs, electronics classes, and anyone learning soldering or basic circuit design.\u003c\/li\u003e\n\u003cli\u003e?? Complete DIY Electronics Kit Includes flower PCB badge with battery holder and switch, NPN transistor, 220? resistor, 100K potentiometer, and red LED.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eProduct Details:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Red\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 0\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Lectrify","offers":[{"title":"Default Title","offer_id":44377485443137,"sku":"MCAB0GTX1TW42","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0736\/6321\/7729\/files\/71WUMjuoiAL.jpg?v=1786466736","url":"https:\/\/toycartusa.com\/products\/soil-moisture-sensor-kit-diy-light-up-plant-water-indicator-with-led-transistor-resistor-learning-circuit-educational-electronics-kit","provider":"ToyCartUSA","version":"1.0","type":"link"}