Archive for the 'LEDs' Category

Petri Dish Audio Meter

Matthew Shieh created this very interesting audio meter. Instead of the typical LM3915 VU meter, MattĀ  designed the amplifier to capture ambient sound from a small mic. For the interface he used a photoresistor and capacitive touch button controlled by a PIC16F716 . The photoresistor lets him dim the LEDs when it’s dark to save power. His project really shines in the write up and best of all fits into a petridish.