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IO pin reference

For reference (e.g. for your own projects based on the same code),
these are the IO pins used on the ItsyBitsy M0 Express:

A0 audio out
A1 touch 3
A2 touch 2
A3 touch 1
A4 MOD
A5 TUNE 1
D0 (20) TUNE 2
D1 (21) TUNE 3
D2 SHAPE 3
D3 (23) TIME
D4 (22) FEEDBACK
D7 SHAPE 1
D9 MIX
SCK ENV 1
MOSI ENV 2
MISO ENV 3
D10 LED 3
D11 LED 2
D12 SHAPE 2
D13 LED 1

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Summary of Contents for ELMYRA v1.1

Page 1: ...e in possession of this wonderful machine that you likely did not possess before Unless of course this is not your first build in which case I need to tell you that you are a great person First of all let s take stock of all the components that go on the PCB and 2 that go on the panel D are diodes R are resistors C are capacitors U is the integrated circuit and its DIP8 socket ...

Page 2: ...R3 R5 R7 R9 47 Ω no R4 R6 R8 Rx 4 7 k Ω no Rx doesn t go on the PCB but on the panel see below You can substitute it for a lower value if you like the LED to be brighter Do not go below 50 Ω R10 R11 R12 220 k Ω no You could experiment with different resistor values in case you re using different types of touch plates Don t go below 100k or above 1M though R13 R14 R16 10 k Ω no C1 C2 C3 1000 µF yes...

Page 3: ...om the USB power into the USB plug on the microcontroller via this header if you like Pins 1 2 are connected as are pins 3 4 It s not needed though black lines 5 no These are jumpers Use short lengths of wire across the PCB If polarity matters it means you need to pay attention which way you solder the components to the PCB or panel Diodes have a black line on them which needs to match the black l...

Page 4: ... C2 C3 Once more polarity matters except for C7 Now solder the headers onto the PCB Break the long header strip apart as needed by making a small cut on both sides with a sharp knife and then snap it along the edge of your workbench You might use a file to remove burrs and make everything fit nicely Then place C1 C2 and C3 into their place and solder I need not remind you to check the polarity rig...

Page 5: ...E SCRATCH 10 k Ω B You must use this exact value although you could use A logarithmic if you prefer a different response curve Power LED 3 mm blue LED The hole for the socket is 6 mm Env LED x3 3 mm orange LED The holes for the sockets are 6 mm Power switch SPDT The hole is 6 mm ENV switches x3 SPST The holes are 6 mm You may use SPDT as well SHAPE switches x3 SPST The holes are 6 mm You may use S...

Page 6: ...Populate the panel Now place all components in their respective holes See this diagram view from the back of the panel ...

Page 7: ... use SPDT the same but leave the third pin unattached to any wires For SPDT the middle pin will connect to either top or bottom pin depending on the position Use a multimeter to check if you re unsure The bite switch gets two individual wires to the PCB They should be connected if the switch is in the down position If you use an SPDT here leave one pin empty The power switch must be an SPDT Its mi...

Page 8: ...7 k Ω resistor Rx right behind the panel Solder it nicely and keep the legs somewhat short to keep it from moving The high resistance is used to keep the LED dim just like the orange ones for the envelopes A blue LED connected through a more standard 50 Ω resistor is blinding Of course you can change it if you want but don t go below 50 Ω The pots for time feedback mix mod and 3x tune are all 10 k...

Page 9: ...or to ground if it s an electrolytic not the long one The scratch pot is 10 k Ω linear Solder the rightmost leg to the middle leg with a short length of wire Solder a cable there and another one to the leftmost leg not to ground These go to the PCB as seen in the diagram above The top touch pads are all connected among each other and also to 3 3V from the PCB The bottom pads have individual wires ...

Page 10: ... SHAPE 3 13 ENV 3 14 ENV 2 15 ENV 1 16 unused For header JP2 01 TUNE 1 02 MOD 03 TOUCH 1 04 TOUCH 2 05 TOUCH 3 06 ground to jack 07 audio out to jack 08 audio in from volume pot on panel 09 unused 10 from BITE switch 11 to BITE switch and SCRATCH pot left leg 12 from BITE pot middle right leg 13 unused 14 3 3V 15 unused 16 to FILTER on panel Now connect the PCB to the panel Pay attention to the or...

Page 11: ...st be connected to the outer ring of any plug that is inserted into the jack Use a multimeter if you are unsure Flashing the firmware If you ve purchased a pre programmed microcontroller you can omit this step Download the firmware here https github com neutral labs elmyra Install and open Arduino IDE and install the SAMD21 libraries as described here https learn adafruit com introducing itsy bits...

Page 12: ...rence For reference e g for your own projects based on the same code these are the IO pins used on the ItsyBitsy M0 Express A0 audio out A1 touch 3 A2 touch 2 A3 touch 1 A4 MOD A5 TUNE 1 D0 20 TUNE 2 D1 21 TUNE 3 D2 SHAPE 3 D3 23 TIME D4 22 FEEDBACK D7 SHAPE 1 D9 MIX SCK ENV 1 MOSI ENV 2 MISO ENV 3 D10 LED 3 D11 LED 2 D12 SHAPE 2 D13 LED 1 ...

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