Version 3
    element14 presents
    ADC LED Volume Meter with Arduino Uno

    The Learning Circuit | element14 presents |  Project Videos



    The audio signals interpreted by microphones are analog, but the circuits that process those signals are digital. In this build, Karen shows how to use the analog to digital converter in an Arduino Uno to process the audio signals from a stereo microphone kit that she made in a previous episode of The Learning Circuit. The converted digital signals are then used to display the volume on an array of LEDs. Check out the video to see how she does it!


    Bill of Material:


    Product NameManufacturerQuantityBuy KitBuy Kit
    Red LED, Through Hole, 5mm, 20 mA, 2.1 VLED TECHNOLOGY3Buy NowBuy Now
    LED, Yellow, Through Hole, T-1 3/4 (5mm), 5 mA, 1.9 V, 587 nmMulticomp Pro2Buy NowBuy Now
    LED, Green, Through Hole, T-1 3/4 (5mm), 20 mA, 2.1 V, 570 nmMulticomp Pro3Buy NowBuy Now
    Through Hole Resistor, 220 kohm, 250 mW, ± 1%, Axial Leaded, 250 VMulticomp8Buy NowBuy Now
    Phone Audio Connector, Socket, 3, PCB Mount, Metal Body, Silver Plated Contacts RoHS Compliant: YesLumberg1Buy NowBuy Now
    Power Bank, 5V, 2.2 Ah Capacity, 2 Ports, 92 mm x 23 mm x 23 mmMULTICOMP PRO1Buy NowBuy Now
    USB Cable, Type A Plug to Type B Plug, 162 mm, 6.3 ", USB 2.0, WhiteAMP - TE CONNECTIVITY1Buy NowBuy Now
    MK136 -Hobby Project Kit, Super Stereo Ear, Stereo Audio Amplifier, 2 x MicrophonesVelleman1Buy NowBuy Now
    Arduino Uno, ATmega328P MCU, 14 3.3V I/O, 6 Analogue Inputs, 6 PWM OutputsArduino1Buy NowBuy Now
    Audio / Video Cable Assembly, Patch Hi Flex, 3.5mm Slim Stereo Plug to 3.5mm Slim Stereo Plug, 6"MULTICOMP1Buy NowBuy Now
    Pin Header, Board-to-Board, 2.54 mm, 1 Rows, 18 Contacts, Through Hole, MC34 SeriesMulticomp2Buy NowBuy Now


    Additional Parts:


    Product Name
    Computer with Arduino IDE
    Arduino Uno Hat/Shield