Microduino: An Arduino nearly as small as a quarter, for $20 | Hacker News Reader

Microduino: An Arduino nearly as small as a quarter, for $20

arstechnica.com

85 pointsshawndumas24 comments

Previous discussion, from yesterday: https://news.ycombinator.com/item?id=6426142

I asked the same question yesterday ... how is this different from Tiny Circuits? I got a set of these and Tiny Lily at Maker Faire this weekend. Those seem to be the same size. There is no ethernet shield for Tiny Circuits but is there a fundamental difference?

Also, side note, was there a recent technical innovation in manufacturing that so many small form factor boards are popping up everywhere?

I don't think there is anything fundamentally different between _any_ of the *duino boards, apart from the form-factors. That is one of the interesting aspects about the Arduino ecosystem though: its diversity. IMHO, the Microduino system looks like a collection of awesome little boards that are extremely modular. And yes, that is pretty similar to what the TinyDuino offers.

So what?

The most powerful aspect of the Arduino is not the boards anyway, it's the software platform with the incredible number of libraries that makes it dramatically easier to program the atmega328 and its relatives. In fact, I have never bought an actual Arduino board, but alway rolled my own. But I'm still using the Arduino IDE, even though as an editor is sucks, simply because the libraries make life so much easier.

In case it came out wrong ... I'm not complaining about novelty. I'm merely wondering if I missed something given that so many news outlets are talking about it :)

$12, smaller http://www.femtoduino.com/spex/femtoduino

Looks like you have to ISP program that one, and not even with a standard ISP pinout.

You just need an USB -> RS232(5V or 3.3V) such as an FT232R or other.

Oh, I see. They still didn't use the defacto standard FTDI header pinout however.

No, and you might have to reset it manually for upload, like some of the early and other barebones Arduino versions (instead of relying on the CTS reset trick).

$9, even smaller: http://digistump.com/products/1

And it does USB directly, no need for any additional hardware to talk to your computer.

Extremely CPU and memory constrained compared to a typical Arduino, though. Only a few kB available for your program.

I'd take the femtoduino over the digistump in this case. The atmega328p is vastly superior to it's low pin cousin, attiny85. I'm sure you could engineer the atmega328p to also talk directly to usb as well as it's merely using the V-USB project.

FT232R chip with a few resistors and caps will get the serial to USB set-up. Its fairly simple and in the 232R datasheet.

Is the FT232R (an FTDI chip) the least expensive way to get USB to Arduino? I'm trying to hookup a wireless nrf24L01+ to USB (which talks to another nrf24l01+ and an atmega328p), and I'm looking at PIC chips which are around $2, whereas the FT232R is $4.

It's not even close to the least expensive way - various Chinese-made USB-to-serial chips are cheaper, as is the Atmega8u2 used on more recent Arduinos. The Atmega8u2 is a fully-programmable microcontroller too, as are the larger chips in the range.

You don't even need that. The attiny85 is sufficient.

See https://github.com/Bluebie/micronucleus-t85 It's a bootloader that detects usb in the boot process. If usb is hooked up, you can upload programs, then it will run whatever code is loaded. This bootloader is the same one used on the digistump.

You need 3 diodes and 2 resistors along with the attiny85 chip to make your own usb to serial converter.

But you don't even need that. If you glance at the V-USB wiring examples, all you need is a few diodes & crystal depending on the freq you want. For my projects, I do use the attiny85 and use the built-in oscillator. I use 16mhz for usb communication, but drop down to 1mhz after the boot procedure.

I backed these kickstarter guys: http://www.rfduino.com/ http://www.kickstarter.com/projects/1608192864/rfduino-iphon...

They're shipping now so preorders should ship soon though the femtoduino looks fun, think ill buy one.

I just like the builtin bluetooth le for the rfduino, means I can do some crazy fun stuff with it and still keep it accessible. Mines on its way.

   $352,700 pledged of $5,000 goal

impressed

I'm looking forward to seeing some reviews of these when they start arriving. I'm especially curious to see how well (or rather if) they achieve that Arduino IDE/sketch compatibility, it seems like a point that a lot of ARM-based "arduino compatible" kickstarters have been promising but glossing over. I know that PJRC's (ARM-based) Teensy 3 has had an enormous amount of work put into truly making it compatible, hopefully a lot of that is feeding back into the libraries and main Arduino project in ways that will help all ARM-based Arduino-compatibles.

Even without support for Arduino/Wiring, that NRF51822 should be fun to play with! But it looks like NRF51822 breakout boards are already showing up on ebay at about the same price (and with more pins broken out). So I'm not sure if preordering is too interesting at this point if it doesn't deliver on something above and beyond a mere breakout board.

If you don't demand jumping on the arduino ecosystem bandwagon, and want the smallest possible microcontroller, there's always the PIC-10 series. A little 6 pin SMD chip in a six terminal'd SOT-23 outline. Years ago I built a little dev board to make one talk to a pickit programmer and all that and it works fine. Made it flash morse code and ran out of other ideas for what to do with it. I believe the 10F220 is obsolete now but its more advanced cousins are still available in the same family, just the usual "more memory, more everything". I recall SMD "ZIF" sockets are fiddly. Somewhere on my bench I still have what amounts to a "smart" LED throwie using this tech.

There are also SOT-23-6 parts in the TinyAVR series. The ATtiny4,5,9,10. Here's the 10: http://www.atmel.com/devices/ATTINY10.aspx They use something different than the conventional ISP protocol though (TPI) -- but I think people have come up with ways to do that even with third party hardware and avrdude.

I believe that it is true that Microchip was there first, though. For a while, the lowest pin-count AVRs were SOIC-8 and DIP-8.

Curious about if the "duino" part of the name is a little too similar legally wise.

Note that while we don't attempt to restrict uses of the "duino" suffix, its use causes the Italians on the team to cringe (apparently it sounds terrible); you might want to avoid it. (It's also trademarked by a Hungarian company.)

It is covered here: http://arduino.cc/en/Main/FAQ

Clones and fakes: http://blog.arduino.cc/2013/07/10/send-in-the-clones/

As far as I can tell, they tend to focus more enforcement effort on companies who sell sub-par ripoffs and defects as genuine. It looks like stamping them out is a full time job.

Holy smokes. That is a fairly complete set of modules / boards.

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