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  • Author Author: tariq.ahmad
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ADC LED Volume Meter with Arduino Uno -- The Learning Circuit 94

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
Parents

  • Flashing LED's _and_ a ukulele instrumental - excellent image

    Perhaps a couple of things to check though ?

     

    1) it looks like you have the polarity reversed on the TRS jack plug. The 'sleeve' is normally the ground and the 'tip' and 'ring' are normally the signal connections.

    imageimage

     

    2) it looks like you are sending an alternating current audio signal from the microphone amplifier into A0 pin (AtoD) on the Arduino, which is expecting a positive value.

Comment

  • Flashing LED's _and_ a ukulele instrumental - excellent image

    Perhaps a couple of things to check though ?

     

    1) it looks like you have the polarity reversed on the TRS jack plug. The 'sleeve' is normally the ground and the 'tip' and 'ring' are normally the signal connections.

    imageimage

     

    2) it looks like you are sending an alternating current audio signal from the microphone amplifier into A0 pin (AtoD) on the Arduino, which is expecting a positive value.

Children