Analog Envelope Follower
Arduino sound amplitude detector
Envelope follower is a common term for analog modular synthesizer users, by definition it’s “used to detect the amplitude variations of an incoming signal to produce a control signal that resembles those variations.” meaning that it follows the audio amplitude envelope creating a voltage output that resembles the audio signal volume, in this case between 0 and +5 volts
Features
1 mono & 1 stereo 3.5mm jack input ( with individual volume* and decay** controls )
2 leds monitor each channel’s amplitude
Jumper selectable 2 mono channel analysis or 1 stereo analysis
Selectable analog inputs ( through two jumper cables you can route the outputs of the envelope followers to any analog input
Stackable shield
* volume works as an attenuator/amplifier for the incoming sound
** decay adjusts how quickly the voltage drops after a sound peak.
Code Examples
Linear Audio analysis
Logarithmic Audio analysis
Schematic & Board files
Download .zip file here>
Credits
The circuit used in this shield was inspired from a schematic by Tom Bugs of BugBrand
Prices
assembled and tested: 25€
pcb & parts kit: 17€
pcb: 4€
+ shipping from Lisbon, Portugal
payments by Paypal only
please fill out the form below if interested, i’ll contact you soon…
Audio Input Shield
(there’s an 8 pin header missing above)
Analog Envelope Follower
Arduino sound amplitude detector
Envelope follower is a common term for analog modular synthesizer users, by definition it’s “used to detect the amplitude variations of an incoming signal to produce a control signal that resembles those variations.” meaning that it follows the audio amplitude envelope creating a voltage output that resembles the audio signal volume, in this case between 0 and +5 volts
Features
1 mono & 1 stereo 3.5mm jack input ( with individual volume* and decay** controls )
2 leds monitor each channel’s amplitude
Jumper selectable 2 mono channel analysis or 1 stereo analysis
Selectable analog inputs ( through two jumper cables you can route the outputs of the envelope followers to any analog input
Stackable shield
* volume works as an attenuator/amplifier for the incoming sound
** decay adjusts how quickly the voltage drops after a sound peak.
Code Examples
Linear Audio analysis
Logarithmic Audio analysis
Schematic & Board files
Download .zip file here>
Credits
The circuit used in this shield was inspired from a schematic by Tom Bugs of BugBrand
Prices
assembled and tested: 25€
pcb & parts kit: 17€
pcb: 4€
+ shipping from Lisbon, Portugal
payments by Paypal only
please fill out the form below if interested, i’ll contact you soon…