{"product_id":"kit-signal-envelope-follower-chart","title":"Signal Envelope Follower Chart Kit with Arduino Mega","description":"\u003ch1\u003eBuild a Real-Time Signal Envelope Follower Chart with Arduino Mega – Master DSP and Kalman Filtering\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 Advanced\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eBuild Time:\u003c\/strong\u003e 5-6 hrs\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eAge:\u003c\/strong\u003e 18-21\u003c\/span\u003e\n  \u003cspan\u003e\u003cstrong\u003eSkill:\u003c\/strong\u003e Digital Signal Processing (Kalman Filtering)\u003c\/span\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eTransform live audio into a dual-trace visual display that separates noise from meaningful amplitude dynamics. You’ll wire up a MAX9814 microphone amplifier, track raw peak voltages with an LM358, and run a Kalman filter on the Arduino Mega to smooth the signal. The 2.4-inch TFT plots both the jagged, unfiltered envelope and the clean, denoised version side by side—perfect for analyzing speech loudness, music transients, or any sound pattern in real time.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Build\u003c\/h2\u003e\n\u003cp\u003eA handheld audio envelope monitoring station that graphs the instantaneous amplitude of your surroundings. Point it at a speaker and watch the raw signal bounce with every syllable while the Kalman‑filtered trace follows the true loudness contour without false spikes. The finished board runs from a 9 V battery and fits in your palm, giving you a portable DSP instrument you can use for beat detection, voice activity measurement, or as a front‑end for further audio processing projects.\u003c\/p\u003e\n\n\u003ch2\u003eWhat You'll Learn\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eReal-time analog signal conditioning with the MAX9814 microphone amplifier and LM358 precision peak detector\u003c\/li\u003e\n  \u003cli\u003eImplementing a Kalman filter on the Arduino Mega to remove noise from audio amplitude data\u003c\/li\u003e\n  \u003cli\u003eDriving a 2.4‑inch ILI9341 TFT display to render live, dual‑channel waveform charts\u003c\/li\u003e\n  \u003cli\u003eIntegrating analog front‑ends with digital processors on a prototyping board—no soldering iron worries with pre‑tested layouts\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 Mega 2560\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMAX9814 Mic Amp\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e2.4in TFT ILI9341\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLM358 Op-Amp\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e100nF Capacitors\u003c\/td\u003e\n\u003ctd\u003e10\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e10kΩ Resistors\u003c\/td\u003e\n\u003ctd\u003e5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePCB Prototype Board\u003c\/td\u003e\n\u003ctd\u003e2\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e9V Battery Snap\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSoldering Iron\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSolder Wire\u003c\/td\u003e\n\u003ctd\u003e1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWhy Buy This Kit Instead of Sourcing Parts Separately\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFactor\u003c\/th\u003e\n\u003cth\u003eSourcing Separately\u003c\/th\u003e\n\u003cth\u003eCompoden Kit\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompatibility checks\u003c\/td\u003e\n\u003ctd\u003eYou verify bias voltages, noise margins, and oscillation risks for the analog chain\u003c\/td\u003e\n\u003ctd\u003ePre‑tested as a system: MAX9814 → LM358 → Mega ADC levels matched, no ground‑loop hum\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBuild support\u003c\/td\u003e\n\u003ctd\u003eForums, scattered tutorials on Kalman filters for Arduino that rarely match your exact circuit\u003c\/td\u003e\n\u003ctd\u003eAI companion trained on this specific signal path and filter code, accessible by QR code\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTime to first working build\u003c\/td\u003e\n\u003ctd\u003eDays of debugging the envelope detector and tuning the Kalman gain\u003c\/td\u003e\n\u003ctd\u003eHours, with step‑by‑step calibration guidance and pre‑written Arduino sketches\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eShipping coordination\u003c\/td\u003e\n\u003ctd\u003eMultiple sellers, multiple delays\u003c\/td\u003e\n\u003ctd\u003eOne shipment from Bengaluru in 3‑5 days\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho This Kit Is For\u003c\/h2\u003e\n\u003cp\u003eDesigned for B.Tech ECE and EEE students diving into digital signal processing coursework or final‑year projects that demand live data visualization. Ideal for Smart India Hackathon teams who need a portable, hackable audio analyzer that can be adapted to gesture recognition or noise monitoring. Equally at home in CBSE Class 12 advanced electronics labs or the maker spaces of IITs, NITs, VIT, and BITS Pilani—wherever an understanding of real‑time filtering meets hardware.\u003c\/p\u003e\n\n\u003ch2\u003eBuilt and Backed by Compoden\u003c\/h2\u003e\n\u003cp\u003eEvery Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.\u003c\/p\u003e\n\n\u003cdetails\u003e\u003csummary\u003eWhat if I get stuck during the build?\u003c\/summary\u003e\u003cp\u003eOpen the AI companion via the QR code on the box; it can walk you through circuit checks, filter tuning, and code debugging. You can also message us on WhatsApp for direct engineer support.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the Kalman filter code pre-loaded or do I write it myself?\u003c\/summary\u003e\u003cp\u003eThe Arduino Mega comes with a blank sketch; the AI companion provides the complete Kalman filter code calibrated for this exact analog front‑end. You’ll tweak the measurement noise and process noise values to see their effect.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan I use this kit to detect beats in music?\u003c\/summary\u003e\u003cp\u003eAbsolutely. The envelope follower tracks amplitude changes in real time. You can extend the provided code with a beat‑detection algorithm that triggers on rising edges of the filtered envelope.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes the kit include a case or enclosure?\u003c\/summary\u003e\u003cp\u003eNo separate enclosure is included; the boards are meant for prototyping. Many builders design a 3D‑printed case—the AI companion can suggest dimensions that fit the PCB.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003cdiv class=\"kit-description\"\u003e\n  \u003cp\u003eMAX9814 audio peak detector tracked by Kalman filter. TFT shows raw signal and smooth envelope together.\u003c\/p\u003e\n  \u003ch4\u003eWhat's in this kit\u003c\/h4\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/mega-2560-r3-development-board-arduino-compatible-54-io-256kb\"\u003eArduino Mega 2560\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/max9814-mic-amp-module-with-agc-for-arduino-projects\"\u003eMAX9814 Mic Amp\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/elecrow-24inch-esp32-solo-miner-lcd-display\"\u003e2.4in TFT ILI9341\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/lm358-op-amp-dual-low-power-operational-amplifier-ic-compoden\"\u003eLM358 Op-Amp\u003c\/a\u003e\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 x10\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\/esp-wroom-32-breakout-board-pcb-55x52mm\"\u003ePCB Prototype Board\u003c\/a\u003e x2\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    \u003cli\u003e\u003ca href=\"\/products\/soldering-kit-25w-with-solder-wire-flux-paste-compoden\"\u003eSoldering Iron\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/products\/soldering-kit-25w-with-solder-wire-flux-paste-compoden\"\u003eSolder Wire\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\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 Signal Envelope Follower Chart Kit with Arduino Mega?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Signal Envelope Follower Chart Kit with Arduino Mega includes all components needed: Arduino Mega 2560, MAX9814 Mic Amp, 2.4in TFT ILI9341, LM358 Op-Amp, 100nF Caps 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 Signal Envelope Follower Chart Kit with Arduino Mega?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"This kit is designed for Advanced level makers, suitable for ages 18-21. MAX9814 audio peak detector tracked by Kalman filter. TFT shows raw signal and smooth envelope together. Estimated build time is 5-6 hrs.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can I buy the Signal Envelope Follower Chart Kit with Arduino Mega online in India?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes, the Signal Envelope Follower Chart Kit with Arduino Mega 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\": \"Signal Envelope Follower Chart Kit with Arduino Mega\",\n  \"description\": \"MAX9814 audio peak detector tracked by Kalman filter. TFT shows raw signal and smooth envelope together.\",\n  \"sku\": \"CDN-KIT-2097\",\n  \"brand\": {\"@type\": \"Brand\", \"name\": \"Compoden\"},\n  \"offers\": {\n    \"@type\": \"Offer\",\n    \"url\": \"https:\/\/compoden.in\/products\/kit-signal-envelope-follower-chart\",\n    \"priceCurrency\": \"INR\",\n    \"price\": \"3650\",\n    \"availability\": \"https:\/\/schema.org\/InStock\",\n    \"seller\": {\"@type\": \"Organization\", \"name\": \"Compoden\"}\n  },\n  \"category\": \"Data \u0026 Visualization\"\n}\n\u003c\/script\u003e\u003cp\u003e\u003cstrong\u003eChoose your assembly option:\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSoldering Kit\u003c\/strong\u003e — 25W soldering iron, 60\/40 solder wire, flux, and small perfboard for permanent assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreadboard Combo\u003c\/strong\u003e — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Compoden","offers":[{"title":"Clone \/ Soldering Kit","offer_id":53469315268973,"sku":"CDN-KIT-2097-CL-SLD","price":2930.0,"currency_code":"INR","in_stock":true},{"title":"Clone \/ Breadboard Combo","offer_id":53469315301741,"sku":"CDN-KIT-2097-CL-BB","price":2400.0,"currency_code":"INR","in_stock":true},{"title":"R3 Original \/ Soldering Kit","offer_id":53469315334509,"sku":"CDN-KIT-2097-R3-SLD","price":5360.0,"currency_code":"INR","in_stock":true},{"title":"R3 Original \/ Breadboard Combo","offer_id":53469315367277,"sku":"CDN-KIT-2097-R3-BB","price":4830.0,"currency_code":"INR","in_stock":true},{"title":"R4 WiFi \/ Soldering Kit","offer_id":53469315400045,"sku":"CDN-KIT-2097-R4-SLD","price":4680.0,"currency_code":"INR","in_stock":true},{"title":"R4 WiFi \/ Breadboard Combo","offer_id":53469315432813,"sku":"CDN-KIT-2097-R4-BB","price":4150.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0999\/3997\/5533\/files\/kit-signal-envelope-follower-chart.png?v=1781947695","url":"https:\/\/compoden.com\/products\/kit-signal-envelope-follower-chart","provider":"Compoden","version":"1.0","type":"link"}