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A pen sized analysis device, almost. One step closer to a sonic screwdriver... Now, just add a super inductive magic magneto unlocker thinga majig and you are set.

http://projectgus.github.io/hairless-midiserial/ Maybe this is what you want. Still has the issue with identifying devices. Edit: Okay, that link above is not what I thought it was. It points to a serial to midi driver here: http://www.tobias-erichsen.de/software/loopmidi.html

I would suggest you learn how to grab the serial number in each. I "think" each teesny has a unique number that is not overwritten in the firmware when you program it. Then your app will try all the serial ports to determine if 1. they are a device they should be talking to and 2. what the id...

Wow, I stumbled across this: http://www.hardkernel.com/main/products/prdt_info.php?g_code=G141578608433&tab_idx=2 Apparently it is very comparable to the Pi in that it will run Ubuntu, but there is also an Android port for it. Could be another option for a low cost dev system. So the age of...

@Constantin, Is there some kind of: fail over, hot plug, or dual supply priority chip out there? I would think with mobile devices being common with chargers and the like there would some sort of supply priority chip out there. Also, maybe I am missing it, but why can't you use a diode? Is...

Yeah, a hacksaw to the place where the padlock attaches. or tin snips. padlock is just like Windows Defender. look impressive, you just go around it.

considering that most passwords can be turned off with a jumper on the motherboard...

By lock up you mean it stops functioning or you just cannot talk to the device? Serial is a huge potential loss especially over USB.

Just out of curiosity isn't this on the same level as trying to get the password to a Mac machine? The reason I ask is because I have seen threads shutdown on here for asking about that. I find these discussion interesting in that we all do stupid things with passwords sometimes so I don't...

I ended up just creating my define cases. That was the most expedient rather than figuring out why the compiler was not getting the proper defines into the compilation. I also got to looking at the wireshark data and found the transmission to the device was a bit more complicated that I first...

I am so close to figuring this out. However the page I linked https://www.pjrc.com/teensy/rawhid.html is not working for overriding the VID and PID. I found the usb_desc.h and was able to change it in there. However, I would like to able to select the correct HID device via the IDE. So...

Apparently it looks like the device is using RAW HID. I found the Teensy 3.1 code for doing RAW HID for itself. Then after looking at the devices code it looks like it is send/response interface where is sends 64 bytes on every message. Then it expects to get 64 bytes back. That sounds like...

Hey, there is a USB HID device I want to emulate for testing. These are things I have available to me: Python and C code showing how to talk to the USB device. I can make out that this is an HID device. A Wireshark dump showing the communication to the device. I don't know USB very well so...

PAUL!!! Holy crap do I WANT this board! I have been looking for a cheap Arduino "like" board. The Teensy 3.1 is awesome, but for $12 HOLY CRAP! I really wanted a cheap, small device for lighting control and 3d printer filament maker control. Wow! When can I buy this?!

I am working on a project that requires some data to be logged on a Teensy 3.1. What are some simple options for storing data? One of my constraints is I cannot spend very much time writing data to a device. So whatever I write to cannot block my application for very long. I read that SD...

Okay I am using this for displaying data from sensors hooked to my teensy: http://www.instructables.com/id/Arduino-Improved-Poor-Mans-Oscilloscope/ The output looks like this: http://imgur.com/NzvGy6N I have to change the serial port in their Processing sketch to match my serial port: //port...

That https://www.saleae.com/ is really nice. I also like the price breakout structure.

I am finding I need a scope type function for troubleshooting some sensors. So I am going to try this: https://code.google.com/p/xoscillo/

One thing you can consider doing is getting an old scope with a dead tube. Then you have all the conditioning electronics on the front end. You will have to strip out the tube power supply and tap into where it spits out the conditioned waveform. Then put in an LCD display and the...

@ddmods, Its sounds like you implemented a "integral" function (integration). That is one piece of a PID loop. If you make the iteration time deterministic the frequency response will be consistent. http://www.automationdirect.com/static/manuals/d4user/ch8.pdf This is the manual I used to...

Not exactly written in C, but the source is partly available for different versions: http://www.cpm.z80.de/source.html Also here is another link referencing the source available from the museum site: http://hackaday.com/2014/10/06/cpm-source-code-released/ Check out the links below on that...

@NOBOX, It is possible that the solder may have had a reaction to the flux and did in fact "grow". When the world decided lead was bad for electronics the choices for solder are not so great. Some of the replacements have issues such as tendril growth over time. This is caused by some...

@PaulStoffregen, It sounds like you could have a flash based "OS" or BIOS all written in regular Arduino IDE. Then you could have "programs" that are launched after loaded into RAM by the OS. So it should be possible to have a game engine like OS on the Teensy 3.1 and load in games from SD...

Can instructions execute from memory? Or do instructions execute from flash? I would think Arm can execute from memory. Android phones do it all the time.

I will have to hazard a guess it is Windows. I have seen some really weird stuff with Windows. USB devices will randomly reattach, or Windows decides it needs to inform you that a device could work better on another port even though it has worked perfectly on that port for months. Sometimes I...

Unless you get the dev package for those Bluetooth devices (and even then) it will be difficult to convert those serial modules to Joystick Bluetooth devices. I have some of those 8 dollar BT serial devices and am on the email list for the dev environment for them. However, they are a...

It is not a reset button. It is a "start programming sequence" button. Look at this page at the bottom to see where the reset signal is wired up: https://www.pjrc.com/teensy/teensy31.html

Hey Paul, I have FreqMeasure working now and it uses pin 3. I also have tone running on pin 5. I understand these are separate PWM hardware counters for those pins. Are there any interactions I should worry about? I noticed FreqMeasure talks about analogWrite (PWM) and I assume that is...

After looking at the command line version I am guessing it will program the first teensy 3.1 it finds. I don't think it is a limitation of how it was programmed, more a limitation of how to address the teensy you want to program. I could see if being done if you could control the USB port...

Oh, okay, I will do that. Thanks. I am using 1.20 at home, but at work I was still on 1.19.

Edit: This is wrong. There is no way to differentiate between teensy board with an option from the command line. Ignore my comment. Yes, they could be concurrent using the command line loader: https://www.pjrc.com/teensy/loader_cli.html Then in your Linux or Mac script file have each line...

I am trying to use the FreqMeasure library here: https://www.pjrc.com/teensy/td_libs_FreqMeasure.html I added the FreqMeasure library (unzipped) into the libraries directory under the main Arduino directory where all the sketches are stored. Then I added the header file to my sketch and I get...

@farman, This is probably not related, but Vdd must be 4.5VDC for HCT chips. HC chips can be as low as 2VDC for Vdd. This is from the NXP docs BTW. http://www.nxp.com/documents/data_sheet/74HC_HCT125.pdf Like you observed it really should not be affecting noise because you see no different...

@Docedison, I was thinking the grounding issue with my cable was that one side was acting like an antenna. Your point is good though. I will have to check to see if both grounds on my audio cable are indeed connected at the connector. Considering it was salvaged from headphones that is a...

@duff, Yes, I have seen that on Windows. If you have an empty loop() it will not show up as a USB device. Add a delay or some Serial.println and it shows up just fine as a serial device.

Check to see if "USB Type" is set to "serial" in the "Tools" toolbar menu. Might want to check other things too like "Board" is set to Teensy 3.1 and not Teensy 3.0 and stuff like that. That is my only other guess on this.

I tried your code. It causes Windows to think my Teensy 3.1 malfunctioned and it ceases to be recognized by the USB driver. I changed it to this: void setup() { Serial.begin(38400); } void loop() { //printf("Hello World\n"); Serial.println("Hello World"); delay(250); } Now it...

On the HCT chip make sure any unused inputs are tied to either Vdd or Ground or it could cause issues with the chip. Is 5VDC the wall wart well regulated? Now I had noise issues on just AD on my teensy 3.1. I was bringing in audio from the PC and had only one of the ground wires from my...

@christoph, Hey, I had to create a work account since I don't have my password from home here. I think I was way off in my conclusion that the refs are not working with memory locations. After reading your experience with one function versus another I made a test program to see if the refs...