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No reply? nothing?

Btw, I followed this guide: http://www.pjrc.com/teensy/troubleshoot.html

Hello I have teensy 2++ that was working perfectly fine until it just stopped, for no reason, it was connected to a seed studio gprs 2 shield and stable 5v that came from a computer usb, It appears that the computer doesn't detect it and I cant seem to upload anything to it, moreover, it seems...

My 2 cents: when connected to USB the power comes from your computer via the 5v,gnd pins on the usb. so you wont be able to see it from the current meter which monitors the battery.

I got it through sparkfun, it was brand new. Stuff is becoming even weirder. I tried a new teensy, it worked well. after running my own app code (if you want I can mail it to you) which uses seeedstudio gprs v2 shield for around one day, the pin D0 also stopped pulling up. (tested using the...

Tried another teensy, it appears to be HW fault. Pual, do you think theres a way to fix it? What should I do?

So I got this code: void setup() { pinMode(PIN_D0, INPUT_PULLUP); } When measuring pin D0 with a multimeter I get ~1.75 volts, nothing is connected to the teensy and it is powered from USB I tried also: pinMode(PIN_D0, INPUT); digitalWrite(PIN_D0, HIGH); Same results. writing LOW to...

You guys are definitely right. I will try to make a short program that (hopefully) reproduce the error. Thanks

Thanks Paul, I was looking for that kind of information. wondering if some peripherals just stopped working as well.. Demolish - I mean that the code stops running, (I have a led which blinks when the code runs and it get stuck to high)

Hi all I am using Teensy 2++, when using 4Mhz frequency my program runs perfectly. but when switching to 2 or 1 Mhz sometimes it locks up after a while (could be between 1 minute to 1 day). Now my intention here is NOT that you debug my code (which is quite long) but to find a document or...

So I just got 3 new Teensy 2++ and it all works great on them. so it must be a hardware fault, my guess is that something has gone awry in the mcu itself. I would ask to return it if the shipping to Israel wasn't so expensive.. Anyway, so thats it.

I am 100% sure that Paul has measured this current, I ordered 3 new teensy2++ and will measure them, I now suspect a hardware fault in my teensy..

Hi Paul, As you can see from the code I posted, I already had the exact code in the setup function. So thats not that.

I just had a misfortunate case, I ordered 3 Teensy 2++ but didn't receive it, probably a problem in either US post or the Israeli post. anyway, thumbs up for Paul since he fully refunded me.. I will probably order around 5 units and just ship it with Fedex in a couple of days/weeks.. its worth...

Something I picked on the comments: These headers are good only if you want to avoid the soldering, they are NOT removable.

I feel your pain, I accidentally ruined the B2 ring so I had to solder the wire directly to the chip, about 1 hour of surgery like process. all because I tried to de-solder a daughterboard... Btw, when possible, I use a simple header to connect/disconnect the teensy from most of my projects...

Does anyone have any ideas? could it be faulty hardware?

Btw, this doesn't help: https://forum.pjrc.com/threads/23365-Teensy-2-0-low-power-minimum-current And I want to clarify, the board is on a matrix with only 1Ohm resistor connected to it, the resistor is connected to the power supply (5V), ofcourse, the ground is also connect to the same power...

Hello, Funny stuff.. So I uploaded the low power example, 2Mhz mode to my teensy 2++, after uploading I removed the usb cable and connect the VDD to external 5v battery. when measuring the current (I have a small 1Ohm resistor in serial to the VDD pin) I get ~33mA, after pressing the arduino...

Teensy 2.0 - 3.3V external power supply Hello, I want to power my teensy 2.0 via an external power source, can I just connect the 3.3v to the Vin pin and cut/short the 5v 3.3v pads? Thanks

I will try your fix, thanks.

I dont understand how you cant read the image, the quality you see is poor? or do you just cant access the image?

Can you maybe recommend me on a gprs lib that would make everything easier..? (the arduino official lib doesn't support sim900)

In the image it is shown that every other 3rd or 4th "request" in cut in the middle, at random places. the code itself sends the long query and reads the response. thats all. also, something a bit interesting, whenever I added a delay after the trasmit it screwed everythings up, when I put it...

I tried a simpler program, with same setup, both code and serial window in the following image I think the problem might lay with the rx buffer of the teensy? what do you think? by the way, thanks for all the help

This is the screenshot of the serial window: http://i.imgur.com/jARJCWV.png afterwards the program get stuck.

You think the problem might lay in the receiving end?I can try to connect the tx/rx to arduino and check what it receives.. I am using 1.0.4, do you think that might be the problem? by the way, what buffer do you use? (rx/tx buffer for the hwserial)

By the way, any working library for gprs and teensy will be happily accepted

mlu: these extra spaces were not in the actual code, here is the full test code: it is based on the cooking hacks code: http://www.cooking-hacks.com/index.php/documentation/tutorials/arduino-gprs-gsm-quadband-sim900#step8 #include <Time.h> #include <Streaming.h> time_t t; int8_t answer; int...

Hello, I am sending a very long string to seeedstudio gprs modem (v.2) and the string is cut in the middle, I tried every single transmit baud for the connection and it always reappears. when using the same code with arduino mega it works great. Any ideas what to do? p.s. my query string...