{"product_id":"capacitive-soil-moisture-sensor","title":"Capacitive soil moisture sensor","description":"\u003cmeta name=\"description\" content=\"Buy Capacitive soil moisture sensor online in India at best price from The Tech Depot, Bengaluru. Authentic product, 7-day warranty on manufacturing defects, fast delivery across India.\"\u003e\n\u003ch1\u003eCapacitive Soil Moisture Sensor\u003c\/h1\u003e\n\u003cp\u003eCorrosion-resistant capacitive soil moisture sensor from The Tech Depot, Bengaluru. Unlike resistive sensors, this module uses capacitive sensing to detect moisture levels without exposed metal electrodes - delivering longer lifespan, more stable readings, and reliable performance in real-world soil conditions. Ideal for automated plant watering systems, smart agriculture, and IoT garden projects. Fast shipping, 7-day warranty on manufacturing defects, and expert support.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensor Type\u003c\/td\u003e\n\u003ctd\u003eCapacitive (No Exposed Electrodes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Voltage\u003c\/td\u003e\n\u003ctd\u003e3.3V - 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Signal\u003c\/td\u003e\n\u003ctd\u003eAnalog Voltage (inversely proportional to moisture)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e~1.2V (wet) to ~2.5V (dry) at 3.3V supply (typical)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Current\u003c\/td\u003e\n\u003ctd\u003e 5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePCB Dimensions\u003c\/td\u003e\n\u003ctd\u003eApprox. 98 mm x 23 mm (3.86\" x 0.91\")\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSensing Element\u003c\/td\u003e\n\u003ctd\u003eCopper traces beneath corrosion-resistant PCB coating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003e3-pin header - VCC, GND, AOUT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Boards\u003c\/td\u003e\n\u003ctd\u003eArduino, ESP32, ESP8266, Raspberry Pi (with ADC), STM32, and more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCorrosion Resistance\u003c\/td\u003e\n\u003ctd\u003eHigh - no metal contacts exposed to soil\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOn-board IC\u003c\/td\u003e\n\u003ctd\u003e555 Timer \/ TLC555 (generates measurement signal)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-40 degreesC to +85 degreesC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eOriginal \/ Authentic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003e7-day warranty on manufacturing defects\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupport\u003c\/td\u003e\n\u003ctd\u003eEmail \u0026amp; WhatsApp 24\/7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacitive sensing technology:\u003c\/strong\u003e Measures soil moisture by detecting changes in capacitance rather than conductivity - no metal electrodes touch the soil, eliminating corrosion and electrolysis problems common with resistive sensors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDramatically longer lifespan:\u003c\/strong\u003e Resistive sensors degrade within weeks in moist soil. This capacitive module lasts months to years with consistent accuracy, making it viable for permanent installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple analog output:\u003c\/strong\u003e Provides a continuous analog voltage that decreases as soil moisture increases - connect directly to any ADC pin and start reading immediately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide voltage compatibility:\u003c\/strong\u003e Operates at both 3.3V and 5V logic levels, working seamlessly with Arduino Uno, Nano, Mega, ESP32, ESP8266, STM32, and Raspberry Pi Pico.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow power consumption:\u003c\/strong\u003e Draws only ~5 mA, making it suitable for battery-powered and solar-powered remote monitoring stations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact and insertable design:\u003c\/strong\u003e Slim PCB profile slides easily into soil, pots, grow bags, and raised beds without disturbing roots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo calibration circuitry needed:\u003c\/strong\u003e While calibration improves accuracy, the sensor works out of the box - just read the analog value and map it to your moisture scale.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial temperature range:\u003c\/strong\u003e Rated from -40 degreesC to +85 degreesC for outdoor deployments in extreme climates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow It Works\u003c\/h2\u003e\n\u003cp\u003eThe sensor operates on the principle that water has a significantly higher dielectric constant (~80) compared to dry soil (~3-5) and air (~1). An on-board 555 timer IC generates a square wave signal that passes through the copper traces embedded beneath the PCB's protective coating. These traces act as the two plates of a capacitor, with the surrounding soil serving as the dielectric medium.\u003c\/p\u003e\n\u003cp\u003eAs soil moisture increases, the dielectric constant of the surrounding medium rises, increasing the capacitance. This change in capacitance alters the frequency and duty cycle of the 555 timer's output, which is then converted to an analog voltage by the on-board circuitry. The result is a smooth, continuous voltage signal: higher voltage for dry soil and lower voltage for wet soil.\u003c\/p\u003e\n\u003cp\u003eBecause no metal is exposed to the soil, there is no galvanic corrosion, no electrolysis of water, and no gradual degradation of sensing surfaces - the fundamental advantage over traditional resistive fork-type moisture sensors.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose This Over Resistive Sensors?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo corrosion:\u003c\/strong\u003e Resistive sensors have bare metal probes that corrode within weeks in moist soil. Capacitive sensors have fully coated PCBs with no exposed metal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStable long-term readings:\u003c\/strong\u003e Resistive sensor readings drift as electrodes degrade. Capacitive readings remain consistent over months of continuous use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo soil contamination:\u003c\/strong\u003e Resistive sensors release metal ions into soil through electrolysis, potentially harming plants. Capacitive sensors are chemically inert.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetter accuracy:\u003c\/strong\u003e Capacitive measurement is less affected by soil salinity and fertilizer concentration compared to conductivity-based resistive methods.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower maintenance:\u003c\/strong\u003e Deploy once and monitor - no need to periodically replace corroded sensor probes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePinout \u0026amp; Wiring\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\u003ctd\u003e\u003cstrong\u003eSensor Pin\u003c\/strong\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen will I receive my order?\u003c\/summary\u003e\n\u003cp\u003eProducts ship within 1-5 days from our Bengaluru warehouse. Delivery within 7-8 days to most locations across India.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs technical support available?\u003c\/summary\u003e\n\u003cp\u003eYes, 24\/7 support via email and WhatsApp for setup, troubleshooting, and application guidance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is your return policy?\u003c\/summary\u003e\n\u003cp\u003e7-day returns on manufacturing defects only. Full refund or replacement. Not applicable for user damage or misuse.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre bulk discounts available?\u003c\/summary\u003e\n\u003cp\u003eYes, wholesale pricing on orders of 10+ units. Contact us via WhatsApp or email for a custom quote.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eBuy Capacitive soil moisture sensor Online in India\u003c\/h2\u003e\n\u003cp\u003ePurchase the \u003cstrong\u003eCapacitive soil moisture sensor\u003c\/strong\u003e online at \u003ca href=\"https:\/\/thetechdepot.in\"\u003eThe Tech Depot\u003c\/a\u003e - India's most trusted electronics components store. We deliver across all major cities including Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat. Get the best price on \u003cstrong\u003eCapacitive soil moisture sensor\u003c\/strong\u003e with fast 1-5 day shipping from our Bengaluru warehouse. All products are 100% authentic, sourced from authorized distributors with 7-day warranty on manufacturing defects.\u003c\/p\u003e\n\u003cp\u003eLooking to buy \u003cstrong\u003eCapacitive soil moisture sensor\u003c\/strong\u003e at the best price in India? The Tech Depot offers competitive pricing, bulk discounts for orders of 10+ units, and dedicated technical support via email and WhatsApp. Whether you are a hobbyist, student, or professional engineer, we have everything you need for your electronics projects.\u003c\/p\u003e","brand":"The Tech Depot","offers":[{"title":"Default Title","offer_id":48746575757569,"sku":"TTD-18062","price":53.52,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0819\/1577\/3185\/files\/0193caffff67ffae86b96a3d17fa5bca.jpg?v=1778107919","url":"https:\/\/techdepot.in\/products\/capacitive-soil-moisture-sensor","provider":"Tech Depot India","version":"1.0","type":"link"}