Tag Archives: Sound

Sound to light effect


Audio Dancing LED project is a fun filled project which generates a LED dancing sequence depending on the audio level it senses.  This project is based on one of the VU Meter IC LB1403 or CA1403


  • Power supply input 6 to 9 VDC
  • Output 5 LED’s
  • Onboard preset to adjust audio level to the IC
  • Onboard microphone capsule with Preamp
  • Terminal pins for connecting power supply input
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 39 mm x 67 mm

Sound to Light Effect – [Link]

Generation of Sound Using Microcontroller

This project illustrates the use of a microcontroller(MCU) to generate different types of sound. The device uses SST89E54RDA-40-C-PIEMCU, an 8-bit 8051-compatible MCU with embedded SuperFlash memory.The device comes with 24/40KByte of on-chip flash EEPROM program memory which is partitioned into two independent program memory blocks. The primary block 0 occupies 16/32KByte of internal program memory space while the secondary block 1 occupies 8KByte of internal program memory space.

Sound is a function of frequency. This concept has been used to generate sound from the microcontroller. Varying the frequency can produce different types of sounds especially with the use of timer 1 of the MCU to produce different frequencies. Timer is used to produce exact delays and by toggling the output pin, it will generate the desired frequencies. These frequencies are then fed to pin 0 of port 1 which is connected to the speaker. By combining frequencies of different values, different tones will be produced.

The circuit is a basic sound generator that has wide applications such as used in cars that produce sound while reversing. In addition, it supports electronic piano to generate different tones, or in electronic toys to generate sounds. Thus, this device is an effective sound generator that produces an audible sound as preferred by the user.

Generation of Sound Using Microcontroller – [Link]

Sound Activated Outlet


by DIY Hacks and How Tos @ instructables.com:

The Clapper was a popular gadget in the 80’s and 90’s. It let you turn appliances on and off just by clapping. This can be pretty useful, but it has some limitations. First there is the problem of loud noises accidentally turning the lights off. Also, you can’t control multiple outlets independently of each other.

So I decided to make programmable version of the Clapper using an Arduino microcontroller. The Arduino lets you set codes for each outlet. This eliminates false triggering and lets you control multiple outlets independently. Your lamp could be turned on and off with one clapping pattern and your fan could be controlled with another pattern.

Sound Activated Outlet – [Link]

Soundlazer “Snap” – The Directional Parametric Speaker


Focus a beam of sound at objects or into your head!

The Soundlazer directional audio project is the continuation of my first and very successful project here on Kickstarter. I developed the Soundlazer “Snap” during my quest to lower the cost of this amazing technology and give backers the opportunity to explore new possibilities in directional audio.

Parametric speakers like the Soundlazer are directional speaker systems. They use ultrasonic carrier waves to transmit audio to listeners in a focused beam of sound that acts like light from a laser. Generally speaking, only the person standing in front of a parametric speaker can hear the audio being transmitted. People to the sides of the directional audio source hear little or no sound.

Soundlazer “Snap” – The Directional Parametric Speaker – [Link]

Voice Echo


A project has been designed around Holteks Ht8970 voice echo IC. Project can be used in various audio systems karaoke, toys, animatronics, show, display, exhibitions, and sound equipment’s.

The HT8970 is an echo/surround effect processor. It is designed for various audio systems including karaoke, television, sound equipment’s, etc. The chip consists of a built-in pre-amplifier, VCO or Voltage Control OSC, 20Kb SRAM, A/D and D/A converters as well as delay time control logic.

Voice Echo – [Link]

Sound Activated Switch


Clap switch/Sound-activated switch designed around op-amp, flip-flop and popular 555 IC. Switch avoids false triggering by using 2-clap sound. Clapping sound is received by a microphone, the microphone changes the sound wave to electrical wave which is further amplified by op-amp.

555 timer IC acts as mono-stable multi-vibrator then flip-flop changes the state of output relay on every two-clap sound. This can be used to turn ON/OFF lights and fans. Circuit activates upon two-clap sound and stays activated until another sound triggers the circuit.

Sound Activated Switch – [Link]

Lil Bang – Sound trigger for cameras

Viktor made a sound trigger for his DSLR camera:

Now that I can take pictures of lightning I decided that I also want to be able to trigger my camera with sound.

An op-amp filters and amplifies a microphone signal. The output is fed to a PIC microcontroller that triggers the flash when the sound reaches a certain level. The trigger sound level and shutter delay are set with a pot.  [via]

Lil Bang – Sound trigger for cameras – [Link]

Digital Sound Level Meter

This circuit is a digital sound level meter with a LCD screen, capable of displaying 80 characters (4 rows with 20 characters on each). You can build this LCD display. It also provides more debugging information, such as the minimum and maximum analog-to-digital samples that were measured during each period. [via]

Digital Sound Level Meter – [Link]

PIC sound player (PCM to PWM converter)

enide.net writes:

This project makes a PIC microcontroller speak audio PCM sounds using PWM modulation! Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code [1]. Pulse-width modulation (PWM) of a signal or power source involves the modulation of its duty cycle, to either convey information over a communications channel or control the amount of power sent to a load [2].

PIC sound player (PCM to PWM converter) – [Link]