This Arduino sketch uses a USB Host shield to transfer preset data toone of the Yamaha THR guitar amplifiers.It works similar to theYamaha THR Editorin that it uses the same file format for presets and the same USB (MIDI)protocol to send the presets to the THR10. Of course you cannot modifythe presets with the sketch as you can do with the THR Editor.
The benefit is that you can fit the Arduino and everything into a pedalbox and switch between presets without the need for a full-sized computer.
The most interesting part is the send_patch() function. It could be usedon different hardware setups with minor changes.
The sketch was written for the following hardware. There are manyalternatives available which may work with the software as well.
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Software libraries used: Mio product key.
The sketch also expects two momentary switches to navigate through thepresets stored on a micro SD card or in PROGMEM. All pin assignmentsare indicated at the top of THR_Footswitch.ino.
If PROGMEM is used to store the presets, then the Python script patchdump.pymay be used to convert presets from a .YDL file to a PROGMEM variable.
./patchdump.py THR10C.YDL -n 25 > patches.h
This would put the first 25 presets from THR10C.YDL intoPROGMEM. USE_SDCARD then has to be set to 0 in THR_Footswitch.ino touse PROGMEM for presets.
Quite a few people built this project over the past four years andthat is only counting those who contacted me. I'm happy to say thatmost people eventually got the footswitch working but there is onething that caused trouble: the SD card reader. There seem to bemany card readers out there who don't play nicely on the SPI bus. Thesymptom is that the sketch gets stuck because the THR10 is neverrecognized by the USB host. Some people also reported that the SD carditself caused the problems.
When you assemble the project, you should first build the versionwithout the card reader (presets in PROGMEM). When this works reliablyyou can add the card reader. If it then stops working you should try adifferent card reader and/or SD card.
I had good results with a Catalex card reader and a Kingston 8 GBmicro SD card but I also got reports that some revisions of theCatalex reader didn't work.