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14-track MIDI drum machine sequencer for the Arduino. It's like the classic Roland TR707 but programmable and with even more features.
14-track MIDI drum machine sequencer for the Arduino. It's like the classic Roland TR707 but programmable and with even more features.
20 backers pledged $1,806 to help bring this project to life.

Recent updates

On our way to first shipments

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Hello all,

Things are going smoothly towards our first shipments: the first batch of PCB's have arrived, parts are all here, and our assembler is assembling a first article completely assembled unit for verification. If that checks out we will start shipping kits and release the remaining PCB's for assembly.

This will be our last Kickstarter update. We've had several backers join us after the end of the Kickstarter period so to communicate with everyone we've set up a forum on the Beat707 site:

Future announcements and status updates will be posted in the Announcements section of this forum. Please join us!

Moving right along....

Hello all,

PCB's have been ordered, should be here by April 13. Backers who did not need assembled boards should expect their boards+components to be mailed out by the end of that week (April 15). For backers who wanted assembled boards, add on about an extra week.

Make sure to check out the great site William has set up at -- this site includes new videos and the start of some video tutorials to explain product usage.

Even though the Kickstarter period is over we're still accepting orders (see the site, Purchases page). We're going to order about 5-6 extra sets of PCB's and parts for any stragglers so if you know anyone else who might want a Beat707, send 'em our way.

Also, if you want to upgrade your reward level we can accept the difference in payment through PayPal at <>

The final board layout is shown in the attached image. We kept everything mostly the same in order to not require another prototyping cycle (that would have delayed things by about a month). We do have free pins brought out to header spots where you can wire in a CV gate output or potentiometer. Even more free pins are available on a header if you use a Mega.

A couple of small innovations to the final design are:

  • Bottom of the board has been extended (dimensions are now 8.165" x 3.365") to allow numbering the buttons, and also provide extra mounting holes for stability. The board had a tendency to tip towards you when one of the 16 sequence buttons was pressed.
  • LCD brightness and contrast potentiometers were replaced with larger through-hole devices that are easier to solder
  • Great idea by William: PCB's will come with black soldermask, white lettering, key caps will be grey, except for red record button and red 1/5/9/13 sequence buttons (we attempted to show these button colors in the attached image).
  • Extra mounting hole near top-right of board to allow LCD mounting hole to be used just for the LCD and not require a specially-sized screw.

Still coming up soon....

  • Dimensioned drawing of the layout for those making their own enclosures or panels
  • Full bill-of-materials
  • Eagle schematics
  • Image 36934 original

New video demo by William

Here is Wiliam's much-cooler video demo showing off some of the Beat707 advanced features:

Thank you all!

Thank you all for your support of this project! Thanks especially to the backer who signed up 2 minutes before the deadline for giving us a last-minute thrill.

We're going to move fast to get this thing in your hands. William is already hard at work on filling up every last byte of FLASH with programming goodness, and as he mentioned in his last comment, we will eventually be moving this project to its own site,

As the URL suggests, we're going to call this thing the Beat707. We think it's more catchy than "Arduino Drum Machine Step-Sequencer / Groove-Box".

Demo #3

Check out our latest demo:

William still hasn't received the prototype unit we sent him (stuck in Brazilian customs) so we made our own demo at Rugged Circuits Labs using a second prototype and William's latest software. Not nearly as cool as what William is capable of but at least it shows a complete working system.

Working...except for a couple of small bugs: the pushbuttons need better debouncing and the LED's are travelling right-to-left instead of left-to-right. Hmm....maybe that could be a feature for some countries in which people also write right-to-left?

We don't have a true hardware MIDI synth so we cooked one up using a Wusik Station soft synth running on a PC with MIDI-OX MIDI Yoke software and SpikenzieLabs Serial-MIDI software. All this emulation is the source of the lags and occasional dropouts -- not going to be a problem with true low-latency MIDI hardware.

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