Search found 135 matches

by tetsujin
Thu Sep 11, 2014 7:58 am
Forum: MicroView Projects
Topic: Bootloader flash and first projects
Replies: 1
Views: 2290

Bootloader flash and first projects

Don't really have much to show off at this point but I got by bootloader-less Microview re-flashed and used it in a little project: For flashing the bootloader, I actually installed a 4-pin 2mm pitch header on the left side of the unit. It was a very tight fit - I expected to find a little more free...
by tetsujin
Tue Sep 20, 2011 9:17 am
Forum: New Product Ideas
Topic: Arduino Mega in 3.3v, in fact, all Arduino boards in 3.3v
Replies: 6
Views: 1744

Re: Arduino Mega in 3.3v, in fact, all Arduino boards in 3.3v

For tetsujin: Basically, we would send you a prototype product. You would play around with it and put it through the ringer. Then you would send us some feedback (within a timely manner, say 3-6 weeks), and in return you would get to keep the product sent to you. Simple as that. If you're intereste...
by tetsujin
Wed Sep 14, 2011 8:28 am
Forum: New Product Ideas
Topic: Arduino Mega in 3.3v, in fact, all Arduino boards in 3.3v
Replies: 6
Views: 1744

Re: Arduino Mega in 3.3v, in fact, all Arduino boards in 3.3v

JoelEB wrote:Hey Corwin and tetsujin, how would you two like to participate in a new beta tester program that Sparkfun is experimenting with? It just might have something to do with a Mega running at 3.3V.
What would be involved?
by tetsujin
Tue Sep 13, 2011 1:00 pm
Forum: SparkFun Product Questions
Topic: Getting a GPS keyfob to talk to a PIC over USB
Replies: 2
Views: 439

Re: Getting a GPS keyfob to talk to a PIC over USB

USB is a host-driven bus. For two devices to communicate, one must act as the host, and the other as a slave device. Most devices operate as slave-devices only. This includes the FTDI chip and (I expect) the GPS as well. The typical expectation is that a PC will act as the USB host. That said, there...
by tetsujin
Thu Sep 01, 2011 2:37 pm
Forum: New Product Ideas
Topic: Arduino Mega in 3.3v, in fact, all Arduino boards in 3.3v
Replies: 6
Views: 1744

Re: Arduino Mega in 3.3v, in fact, all Arduino boards in 3.3v

One mitigating factor is that the Mega328, at least, is not spec'ed to run at full speed at 3.3V. This is why the 3.3V Arduinos run slower than the 5V ones. (8MHz for the 3.3V ones, 16MHz for the 5V ones.) I don't know if that's also true of the Mega1280 used on the Arduino Megas... Otherwise I agre...
by tetsujin
Tue Aug 30, 2011 3:26 pm
Forum: New Product Ideas
Topic: Small EL driver
Replies: 0
Views: 491

Small EL driver

Largish EL drivers are nice, of course, for driving large amounts of EL panel or wire - but they're kind of overkill if all you want is to drive a single EL panel, like an LCD backlight. A small EL driver circuit for such cases would be really handy. (EDIT) : In particular, I have heard that there a...
by tetsujin
Tue Aug 30, 2011 10:24 am
Forum: SparkFun Product Questions
Topic: Retrofit a non-backlit LCD for a backlight...
Replies: 3
Views: 1185

Re: Retrofit a non-backlit LCD for a backlight...

Well, I guess I found some good information on this. It occurred to me that probably a non-backlit device popular among engineers would be a popular subject for this sort of upgrade, so I searched for pages about backlight upgrades to the HP48 calculator. That led me to a page about retrofitting oth...
by tetsujin
Mon Aug 29, 2011 10:05 pm
Forum: SparkFun Product Questions
Topic: Trouble uploading sketch to ProtoSnap (Pro Mini) from Linux
Replies: 4
Views: 778

Re: Trouble uploading sketch to ProtoSnap (Pro Mini) from Linux

Of course, I have this sneaking suspicion that that's not it, either... After all, you said that the TX LED blinked as well, which would suggest the Arduino is echoing data back to the host, right? Maybe it's a baud rate issue...? Indeed. Do you know what exactly happens in the boot loader after it...
by tetsujin
Mon Aug 29, 2011 12:41 pm
Forum: SparkFun Product Questions
Topic: Retrofit a non-backlit LCD for a backlight...
Replies: 3
Views: 1185

Retrofit a non-backlit LCD for a backlight...

I got myself a portable synthesizer with a non-backlit LCD display and I'd like to fit a light to it... So I'm trying to figure out what my options are. I looked into swapping out the LCD for a backlit type - but the display is a discontinued Optrex display... I don't know if there's a pin-compatibl...
by tetsujin
Mon Aug 29, 2011 12:06 pm
Forum: SparkFun Product Questions
Topic: Trouble uploading sketch to ProtoSnap (Pro Mini) from Linux
Replies: 4
Views: 778

Re: Trouble uploading sketch to ProtoSnap (Pro Mini) from Linux

Most of the troubles I've ever had working with Arduino-derivatives on Linux have had to do with resetting the board. Since that is apparently working, I'd check to make sure the serial data lines between the FTDI board and Arduino board haven't been damaged. (The board is designed to snap apart, af...
by tetsujin
Fri Aug 05, 2011 12:10 pm
Forum: SparkFun Product Questions
Topic: Daydreaming about Blackberry Trackpads
Replies: 0
Views: 360

Daydreaming about Blackberry Trackpads

I don't really keep track of new phones as they come out (and so Blackberries have incorporated this for a couple years now and I just found out today) - but they've got these nice optical trackpads these days instead of the trackballs... It'd be really cool if someone could find a way to interface ...
by tetsujin
Thu Jun 10, 2010 8:34 pm
Forum: Wireless/RF
Topic: What Bluetooth serial comms to PDA
Replies: 2
Views: 406

Re: What Bluetooth serial comms to PDA

I can't say I'm the best person to answer this, but I'll give it a shot... Basically, it depends on what kind of communication you want to do. If it doesn't matter, so long as you can get data from one to the other, then using Bluetooth RFCOMM is easiest, as this seems to be what most of the easy-to...
by tetsujin
Thu Jun 10, 2010 10:59 am
Forum: New Product Ideas
Topic: LED Shield
Replies: 7
Views: 1434

Re: LED Shield

It occurred to me that Sparkfun already sells a version of the RGB matrix display with an SPI interface - so that would be very easy to connect to an Arduino, of course... (Sometimes I do wonder if I'm too preoccupied with having hardware in "shield" form...) What if a future version of the Serial L...
by tetsujin
Thu Jun 10, 2010 10:39 am
Forum: New Product Ideas
Topic: Teensy and Teensy++
Replies: 10
Views: 6937

Re: Teensy and Teensy++

frank26080115 wrote:Once you get rid of the original bootloader, you cannot get it back as it is closed source.
That is actually one of the main reasons I never bought a Teensy, as much as I like the hardware design. It's good to know there are alternative AVR-USB bootloaders available.
by tetsujin
Fri Jun 04, 2010 12:57 pm
Forum: Wireless/RF
Topic: Bluetooth and homebrew...
Replies: 3
Views: 2346

Re: Bluetooth and homebrew...

The most capable modules I have found are the Bluegiga with iWrap4. Take a look at their website and read the specifications carefully to see if they might meet your needs. OK, let's say I'm starting with a single-function device - a Bluetooth Keyboard. First question: My understanding is that this...