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Messages - OpAmp

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miniAtmegatron / Re: "MIDI hack" information
« on: February 13, 2016, 05:51:03 PM »
Just to sketch it a bit. It is not possible to stack the midi shield on the miniAtmegatron or vice versa. Also they may not be pin compatible (to be honest, I did not check all of them - for Rx and Tx it is ok). What I did:
* instead of the usual headers, I stuffed the miniAtmegatron with stackable headers. It is just fine, they are not blocking buttons or pots. These headers allow me to easily hook up jumper wires.
* put the miniAtmegatron on the Arduino board
* put the midi shield next to the Arduino-minitAtmage combo
* using jump wires, connect the 5V, ground, Rx and Tx between them
There you go...

miniAtmegatron / Re: "MIDI hack" information
« on: February 07, 2016, 09:22:39 PM »

The MIDI hack is an update to the firmware in the companion chip that takes care of the USB connection between your PC and the Atmel 328p (Uno) processor. The hack installs in fact a new profile in that chip and makes sure that when the USB is plugged, the Arduino board is listed as a standard MIDI interface to your PC. It becomes effectively a MIDI-USB device (at least for your pc and if you downloaded an application processing MIDI events). Using a jumper you can switch back to the Arduino mode, because you need that to download new code to the 328p). That being said, this is not what you are looking for...

The miniAtmegatron understands out of the box MIDI. You need indeed the correct extra circuity on the serial Rx and Tx pins of the Arduino in order to plug a MIDI DIN connector. I have it working fine by reusing parts of the SparkFun MIDI shield. No MIDI hack needed for that.

Have fun.

miniAtmegatron Hardware technical support / Re: D1 LED: Yellow is missing ?
« on: September 02, 2015, 10:30:25 PM »

I just ordered my kit few day ago. Very much looking forward to get it shortly... so I can not compare.

Not sure whether other members can comment on questions...

But, it is an RGB led. If you scroll through the functions and you see all the 3 primary colors clearly (red, green, blue) according to their coresponding function, I would think the led is fine. Maybe the color mixing is not ok? That is done via the resistors. You may check those again?

miniAtmegatron Hardware technical support / Stackable headers
« on: August 28, 2015, 05:30:45 PM »

Congratulations! Very nice concept!

The miniAtmegatron is delivered with headers that are soldered at the top face of the PCB. Would it be possible that I replace some of them with stackable headers? I mean, is there some solderpad foreseen at the bottom of the board so that I can solder the stackable header? These headers may maybe hamper a bit the accessibility of buttons and pots, but it would allow me to easily use jump wires to further experiment/extend the design.

Kind regards.

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