Our latest offering direct from Forge Electronics is a very exciting 16 channel sound module. This unit was designed to replay up to sixteen different recorded sound effects on radio controlled model boats, but will doubtless find application in other radio control projects. So far it has been used to great effect in several battleships to create various types of gunfire, sound horns and klaxons, make ASDIC ‘pings’, sound ‘General Quarters’, make aircraft and helicopter fly-bys etc. All the hard work is done by a commercially available embedded mp3 player module (the “DFPlayer Mini” seen in the picture above) and the unit’s microcontroller chip simply serves to decode a spare (proportional) radio control channel used to trigger the sixteen sound tracks. A radio controlled volume control has been implemented using a seventeenth channel.
The (user added) sound files are stored on a microSD card (uses 1GB to 32GB cards formatted FAT16 or FAT32) and the player supports MP3 and WAV files with all of the most common sampling frequencies (kHz): 8 / 11.025 / 12 / 16 / 22.05 / 24 / 32 / 44.1 / 48.
The output is monophonic, and stereo tracks are represented as such. A microSD card populated with demonstration tracks is supplied with the unit, and users can thereafter replace them with their own tracks via a card reader on their computer (internal card slot or USB gizmo). There are a great many sound effect libraries on the web from which sounds may be downloaded, usually in WAV format, so a good sound editing package like Audacity (free!) is handy if it is desired to convert them to MP3 format. It can also be useful to clean up lead-in or trail-out artefacts etc. and set the relative volume levels of the tracks with respect to each other. A small speaker is supplied with the unit but provision has been made for any suitable 8 Ohm speaker to be attached. Click Here to view the item.
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This post was written by John Wills