- Usb host to midi converter serial#
- Usb host to midi converter portable#
- Usb host to midi converter pro#
MIDI_CREATE_INSTANCE(HardwareSerial, HW_SERIAL_PORT, MIDI) #define ENABLE_RUNNING_LED // Disable to save 0.5 milliwatts #define BLOCK_ACTIVE_SENSING // Filter out annoying useless "I am alive" messages which mess up playing with many MIDI synths #define DISCARD_INITIAL_JUNK_INTERVAL_MS 1500
Usb host to midi converter serial#
#define SERIALDEBUG_TIMEOUT_MS 5000 // After that, it starts even if no serial debug port active #include // access to serial (5 pin DIN) MIDI Black pins = GND (to MIDI pin 2 and LED negative pins) Orange LED draws 1435 uA at 3.4V = 4.88mW stays lit when a keyboard is not connected (so typically just a few seconds) Orange pin = pin 5 via 1 KOhm (to yellow "no input device" LED). White LED draws 160uA at 3.4V = 545mW stays lit all the time a keyboard is connected White pin = pin 6 via 4.7 KOhm (to white "running" LED). Yellow pin = +3.3V via 47 Ohm (to MIDI pin 4)
PCB: Blue pin = Serial2TX via 47 Ohm (to MIDI pin 5) No problem if the fifth pin is not connected (redundant GND) NOTE: USB Host cable must be plugged with +5V at top position. MIDI female pin 5 to Teensy pin 10 (Serial2 TX) via 47 Ohm (replace with 33 Ohm should problems arise) MIDI female pin 4 to +3.3V via 47 Ohm (replace with 33 Ohm should problems arise) Don't need to set "MIDI" under USB Type "Serial" works OK and allows for VisualMicro SerialMonitor to work (MIDI + Serial works as well, but MIDI is not needed since we only use USB Host MIDI, not microUSB MIDI) Add PANIC button (all notes off): send Control Change message 123 (not SysEx!) on all channels Add bridge from microUSB_input 5V and GND pins to USB Host out, to get more power (but check Teensy 3.6 schematics first! Where does USB Host get power from? Do we risk frying anything?) Handle "SysEx chunks" (not we only have a debug placeholder)
Usb host to midi converter pro#
Jammin Pro PK25: total current = 65mA (340 mW) Miditech37: total current (converted + keyboard) = 65mA (340 mW) Measure how much current is drawn by 5V microUSB when various keyboards (Akai LPK25, Miditech37, ProDipe49, Korg MiniKey etc.) are connected: Check if latency improves with higher CPU clocks (now 24 MHz to save power) Software is not really complete, but works OK for my limited needs: Thanks to my dear friend Alessandro for the soldering work and the 3D printed case.įor the hardware part, I just followed the instructions on PJRC website:Īdded a couple LEDs to signal errors and MIDI connection
I did not need processing power and wanted to save battery, so I downlocked it to 24 MHz, more than enough.Ĭonnected to a smartphone USB powerbank, it runs for many hours while powering the USB keyboard. So this is it: a converter powered by the phenomenal Teensy 3.6. Moreover, when you connect some MIDI USB keyboards, they send spurious junk over MIDI for the first second or so, again causing issues to some hardware modules. There are a few MIDI USB Host converters on the market, but they tend to be pricey and not so flexible for example, the MIDItech USB Host converter I purchased (at $80+ ) does not filter "Keep Alive" MIDI messages, which cause issues with many older MIDI synth modules.
Usb host to midi converter portable#
I wanted to play my MIDI hardware synths with a cheap small portable MIDI USB keyboard.
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