{"product_id":"ky-012-active-buzzer-module-5v-digital-arduino-2pack","title":"KY-012 Active Buzzer Module — 5V, Digital Control, Arduino DIY (2-Pack)","description":"\u003ch2\u003eKY-012 Active Buzzer Module — 5V Digital Control (2-Pack)\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eKY-012\u003c\/strong\u003e is an active buzzer module that produces a fixed-frequency tone when driven \u003cstrong\u003eHIGH\u003c\/strong\u003e from any digital GPIO pin. Unlike passive buzzers, the active buzzer contains its own oscillator — no PWM or tone library needed. Simply write \u003ccode\u003edigitalWrite(pin, HIGH)\u003c\/code\u003e to sound the alarm.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuzzer Type\u003c\/td\u003e\n\u003ctd\u003eActive (self-oscillating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl Signal\u003c\/td\u003e\n\u003ctd\u003eDigital HIGH (5V) = ON, LOW = OFF\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Frequency\u003c\/td\u003e\n\u003ctd\u003e~2.3kHz (fixed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSound Pressure Level\u003c\/td\u003e\n\u003ctd\u003e~85dB @ 10cm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e−40°C to +80°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003e3-pin (VCC, GND, SIG) or 2-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003e2 modules\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eActive vs Passive Buzzer\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eKY-012 Active\u003c\/th\u003e\n\u003cth\u003ePassive Buzzer\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInternal Oscillator\u003c\/td\u003e\n\u003ctd\u003e✅ Yes\u003c\/td\u003e\n\u003ctd\u003e❌ No\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eControl\u003c\/td\u003e\n\u003ctd\u003edigitalWrite HIGH\/LOW\u003c\/td\u003e\n\u003ctd\u003etone() \/ PWM required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFrequency\u003c\/td\u003e\n\u003ctd\u003eFixed (~2.3kHz)\u003c\/td\u003e\n\u003ctd\u003eProgrammable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSimplicity\u003c\/td\u003e\n\u003ctd\u003eEasiest\u003c\/td\u003e\n\u003ctd\u003eMore flexible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose KY-012?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZero-Code Simplicity\u003c\/strong\u003e — One digitalWrite() call sounds the buzzer; no tone library needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e85dB Output\u003c\/strong\u003e — Loud enough for alarms and notifications in noisy environments\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide Temperature Range\u003c\/strong\u003e — −40°C to +80°C for outdoor and industrial use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect GPIO Drive\u003c\/strong\u003e — 5V GPIO current sufficient; no transistor driver needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack of 2\u003c\/strong\u003e — Spare included for projects or kits\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTypical Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eArduino alarm and alert systems\u003c\/li\u003e\n\u003cli\u003eDoorbell and notification circuits\u003c\/li\u003e\n\u003cli\u003eCountdown timer audio feedback\u003c\/li\u003e\n\u003cli\u003eSecurity system intrusion alert\u003c\/li\u003e\n\u003cli\u003eRobot collision warning beeper\u003c\/li\u003e\n\u003cli\u003eButton press audio confirmation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eArduino Example\u003c\/h3\u003e\u003cp\u003e\u003ccode\u003epinMode(8, OUTPUT);\u003c\/code\u003e\u003cbr\u003e\u003ccode\u003edigitalWrite(8, HIGH); \/\/ Buzzer ON\u003c\/code\u003e\u003cbr\u003e\u003ccode\u003edelay(500);\u003c\/code\u003e\u003cbr\u003e\u003ccode\u003edigitalWrite(8, LOW); \/\/ Buzzer OFF\u003c\/code\u003e\u003c\/p\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: Can KY-012 be used with 3.3V Arduino\/ESP32?\u003c\/strong\u003e\u003cbr\u003eA: The buzzer requires 5V for rated volume. At 3.3V it may sound quieter or not at all. Use a transistor (2N2222, NPN) to drive it from 5V with a 3.3V control signal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I change the frequency of KY-012?\u003c\/strong\u003e\u003cbr\u003eA: No — active buzzers have a fixed internal oscillator. Use a passive buzzer module if variable frequency is needed.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2× KY-012 Active Buzzer Module\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991487041771,"sku":"\u003cnone\u003e","price":5.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/ky012-active-buzzer-module.webp?v=1761538746","url":"https:\/\/keszoox.com\/products\/ky-012-active-buzzer-module-5v-digital-arduino-2pack","provider":"Keszoox","version":"1.0","type":"link"}