BC547 silk error

Test is okay, but I made the same mistake that I had made in nanoDrum: silkscreen of BC547 is wrong. Must be welded reversed (EBC -> CBE). Anyway now I put the model in the store. Removed the PCB that I used for test and those bought in pre-sale I do not have many in stock ... you'd better hurry. CAUTION: I have not tested the card Teensy (because I ...

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Test Phase v0.8

The new PCBs v0.8 have arrived and they are really nice. Fritzing is a great software. For this version I chose the color black. I included all the innovations that I had introduced with nanoDrum and also the compatibility with Teensy 3.2. Now I do some tests, if it's okay I'll put it in the shop. UPDATE: The test started. It all seems ok. I had some problems with the USB .... ...

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The Italian Job (Mainboard v0.7)The Italian Job (Mainboard v0.7)

New version of the mainboard of the microDrum. This new version supports working at 3.3V Arduino boards (like Arduino DUE) and the MIDI Thru. Of course, to achieve this I had to change a bit the card but can be used in "V5 - No Thru" mode with the same components of the v0.6. In the coming days I will publish the schema and the PDF version of the card. &...

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Arduino DUE (Updated)Arduino DUE (Aggiornato)

Arduino DUE - Summary

MicrocontrollerAT91SAM3X8E
Operating Voltage 3.3V
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
Digital I/O Pins 54 (of which 12 provide PWM output)
Analog Input Pins 12
Analog Outputs Pins2 (DAC)
Total DC Output Current on all I/O lines130 mA
DC Current for 3.3V Pin  800 mA
DC Current for 5V Pin  800 mA
Flash Memory512 KB all available for the user applications
SRAM96 KB (two banks: 64KB and 32KB)
Clock Speed  84 MHz
WARNING: The current diagram of microDRUM is not compatible with the Arduino DUE. Even the code is not compatible because of the different processor. I made the changes on a micro-microDRUM and seems to work. I will try to see if it can use the DAC to generate usable sounds, only if I can make it work I will share changes to the schema and code.

Arduino DUE - Summary

MicrocontrollerAT91SAM3X8E
Operating Voltage 3.3V
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
Digital I/O Pins 54 (of which 12 provide PWM output)
Analog Input Pins 12
Analog Outputs Pins2 (DAC)
Total DC Output Current on all I/O lines130 mA
DC Current for 3.3V Pin  800 mA
DC Current for 5V Pin  800 mA
Flash Memory512 KB all available for the user applications
SRAM96 KB (two banks: 64KB and 32KB)
Clock Speed  84 MHz
...

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LCD Schema

Sorry for the delay, I was busy with work. Here are the diagrams for connecting an LCD to microDRUM. The code to handle it is still incomplete, but I hope soon to have the time to finish it. I remind you that the LCD screen is optional and microDrum works fine without it, I added it because you asked me. A friend of mine is building a prototype of the ...

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The last stepThe last step

We arrived, after nearly two years of development, the last barrier was broken. The microDrum firmware becomes Open Source. I think it's an important step because the quality of microDrum no longer depend only on me but also by those who want to devote his time. So it is important that each of you publicize this project in order to bring together a larger number of developers. For version 1.1beta ...

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Schema & PCB v0.6Schema & PCB v0.6

Here's the new version of the schema and PCB, there aren't new features, I only corrected a few imperfections before sending for production. Ecco la nuova versione di Schema e PCB, non ci sono novità, ho solo corretto alcune imperfezioni prima di inviare per la produzione.

We’ll all be planning that route…

Attention: so far I have used two microDRUM: "full" (with Arduino Duemilanove) always connected to the pads, the other "flexible" (with Arduino Uno) to test the firmware and special configuration of the pads. As I wrote in some post long ago the presence of a 120ohm resistor between the reset pin and 5V pin prevents autoreset, today I discovered that for the Arduino One is not enough. On the "official" ...

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Some cat was layin’ down some rock ‘n’ roll…

Thank to organic io, we have a new video of microDRUM: What do you think? In my opinion the idea of ​​building a microDRUM without using a soldering iron is great.Grazie a organic io, abbiamo un nuovo video della microDRUM: Che ne dite? Secondo me l'idea di poter costruire una microDRUM senza usare il saldatore è geniale.