{"product_id":"kit-laundry-detergent-level-monitor","title":"Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic","description":"\u003ch1\u003eLaundry Detergent Level Monitor Kit with Arduino Uno \u0026amp; Ultrasonic Sensor — Get Alerts Before Detergent Runs Out\u003c\/h1\u003e\n\n\u003cp class=\"value-summary\"\u003eEvery part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.\u003c\/p\u003e\n\n\u003cdiv class=\"specs-strip\"\u003e\n  \u003cspan\u003e\u003cstrong\u003eDifficulty:\u003c\/strong\u003e Intermediate\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eBuild Time:\u003c\/strong\u003e 3-4 Hours\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eAge:\u003c\/strong\u003e 15-18\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eSkill:\u003c\/strong\u003e Non-contact ultrasonic liquid level sensing\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eRunning out of detergent mid-laundry is a common frustration in busy Indian households and hostels. This kit transforms a standard detergent drum into a smart container that shows the remaining level as a percentage on an OLED display and sounds an alert when the detergent drops below 20%. You’ll build a reliable, battery-powered monitor using an Arduino Uno and an HC-SR04 ultrasonic sensor — no plumbing or modifications to the drum required.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Build\u003c\/h2\u003e\n\u003cp\u003eYou’ll create a compact sensor unit that mounts under the detergent drum’s lid. The HC-SR04 fires ultrasonic pulses down toward the liquid surface and measures the echo time to calculate the remaining detergent volume. The OLED displays a clear percentage, and when the level falls below 20%, a loud active buzzer alerts anyone in the room. The whole system runs on a single 9V battery for quick deployment.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Learn\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eCalibrating an HC-SR04 ultrasonic sensor to convert distance into liquid percentage\u003c\/li\u003e\n  \u003cli\u003eProgramming Arduino Uno to drive a 0.96-inch OLED display via I2C\u003c\/li\u003e\n  \u003cli\u003eImplementing threshold-based alerts with an active buzzer\u003c\/li\u003e\n  \u003cli\u003eBuilding and testing a breadboard prototype with 10kΩ pull-up resistors and filtering capacitors\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eKit Contents\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eComponent\u003c\/th\u003e\n\u003cth\u003eQuantity\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eArduino Uno R3\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eHC-SR04\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr class=\"kit-description\"\u003e\n  \u003cp\u003eHC-SR04 in detergent drum measures remaining level. OLED shows percentage and alerts when below 20%.\u003c\/p\u003e\n  \u003ch4\u003eWhat's in this kit\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/uno-r3-ch340g-atmega328p-board-arduino-compatible\"\u003eArduino Uno R3\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/hc-sr04-ultrasonic-sensor-module-5v-distance-2cm-400cm\"\u003eHC-SR04\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/096in-oled-display-128x64-i2cspi-for-arduino-raspberry-pi\"\u003e0.96in OLED\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/active-buzzer-dc-3-5v-85db-sounder-module-for-arduino-raspberry-pi\"\u003eActive Buzzer\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"\/products\/resistor-variety-pack-100-pcs-10-values-14w-carbon-film\"\u003e10kΩ Resistors\u003c\/a\u003e x5\u003c\/li\u003e\n    \u003cli\u003e\n\u003ca href=\"\/products\/capacitor-variety-pack-6-values-100nf-to-470uf-30-pieces\"\u003e100nF Caps\u003c\/a\u003e x5\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/breadboard-standard-bundle-830400-tie-points-for-prototyping\"\u003e400-pt Breadboard\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003eM-M Wires x20\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/9v-battery-snap-connector-with-15cm-wires-compoden\"\u003e9V Battery Snap\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is included in the Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic includes all components needed: Arduino Uno R3, HC-SR04, 0.96in OLED, Active Buzzer, 10kΩ Resistors and more. Everything is pre-tested for compatibility and shipped from Bengaluru, India.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What skill level is required for the Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This kit is designed for Intermediate level makers, suitable for ages 15-18. HC-SR04 in detergent drum measures remaining level. OLED shows percentage and alerts when below 20%. Estimated build time is 3-4 hrs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I buy the Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic online in India?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, the Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic is available online at Compoden (compoden.in), India's AI-powered electronics and robotics store. Ships from Bengaluru in 1-5 business days across India.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"Product\",\n  \"name\": \"Laundry Detergent Level Monitor Kit with Arduino Uno + Ultrasonic\",\n  \"description\": \"HC-SR04 in detergent drum measures remaining level. 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