ADC LED Volume Meter with Arduino Uno
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 Name | Manufacturer | Quantity | Buy KitBuy Kit |
|---|---|---|---|
| Red LED, Through Hole, 5mm, 20 mA, 2.1 V | LED TECHNOLOGY | 3 | Buy NowBuy Now |
| LED, Yellow, Through Hole, T-1 3/4 (5mm), 5 mA, 1.9 V, 587 nm | Multicomp Pro | 2 | Buy NowBuy Now |
| LED, Green, Through Hole, T-1 3/4 (5mm), 20 mA, 2.1 V, 570 nm | Multicomp Pro | 3 | Buy NowBuy Now |
| Through Hole Resistor, 220 kohm, 250 mW, ± 1%, Axial Leaded, 250 V | Multicomp | 8 | Buy NowBuy Now |
| Phone Audio Connector, Socket, 3, PCB Mount, Metal Body, Silver Plated Contacts RoHS Compliant: Yes | Lumberg | 1 | Buy NowBuy Now |
| Power Bank, 5V, 2.2 Ah Capacity, 2 Ports, 92 mm x 23 mm x 23 mm | MULTICOMP PRO | 1 | Buy NowBuy Now |
| USB Cable, Type A Plug to Type B Plug, 162 mm, 6.3 ", USB 2.0, White | AMP - TE CONNECTIVITY | 1 | Buy NowBuy Now |
| MK136 -Hobby Project Kit, Super Stereo Ear, Stereo Audio Amplifier, 2 x Microphones | Velleman | 1 | Buy NowBuy Now |
| Arduino Uno, ATmega328P MCU, 14 3.3V I/O, 6 Analogue Inputs, 6 PWM Outputs | Arduino | 1 | Buy NowBuy Now |
| Audio / Video Cable Assembly, Patch Hi Flex, 3.5mm Slim Stereo Plug to 3.5mm Slim Stereo Plug, 6" | MULTICOMP | 1 | Buy NowBuy Now |
| Pin Header, Board-to-Board, 2.54 mm, 1 Rows, 18 Contacts, Through Hole, MC34 Series | Multicomp | 2 | Buy NowBuy Now |
Additional Parts:
| Product Name |
|---|
| Computer with Arduino IDE |
| Arduino Uno Hat/Shield |
