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  1. joe_prince

    Looking to buy a reflow oven

    Does anyone have a good reflow oven they can recommend? Looking to get one for small quantity, small board size, personal use. Would like to spend no more than $400 (if that's possible).
  2. joe_prince

    ATMEGA32U4 QFN Bottom Ground Pad Question

    The datasheet for the ATMEGA32U4 (http://www.atmel.com/Images/Atmel-7766-8-bit-AVR-ATmega16U4-32U4_Datasheet.pdf) doesn't mention the bottom ground pad for the QFN package. Besides for thermal reasons, does the bottom pad need to be connected to ground (i.e., is it not already electrically...
  3. joe_prince

    Teensy 2.0 clone I2C & USB conflict

    I'm trying to make a clone of the Teensy 2.0 (which uses the ATMEGA32U4 chip) for a project. I have successfully burned the Leonardo bootloader, Caterina (https://github.com/arduino/Arduino/tree/master/hardware/arduino/avr/bootloaders/caterina), to the board using an Arduino Uno as the ISP...
  4. joe_prince

    Are Teensy 2.0 pins 5V tolerant?

    I can't seem to find the answer online, but wondering if the Teensy 2.0 digital input is 5V tolerant or 3.3V tolerant? Also, for I2C communication would I need to level shift a 3.3V slave signal up to 5V for the Teensy 2.0 to read a logic high? When I connected the I2C lines of a 3.3V slave...
  5. joe_prince

    My First PCB Design - Questions

    I just finished designing a breakout board for the BNO055 chip (first PCB I've designed so it's more for practice than anything). I had a few questions that hopefully some will be able to address. Here are the board, schematic, and GERBER files for reference: Schematic: Board: BNO055...
  6. joe_prince

    OSH Park T3.2 Purple Edition

    Paul - the image for the purple T3.2 from OSH Park isn't loading on this page: https://oshpark.com/teensy Just thought you might want to know.
  7. joe_prince

    0.5mm Pitch LGA Soldering

    I'm eventually going to make a flight controller board for a quadcopter using the BNO055 for inertial measurement, and will have to solder the components to the board myself. The BNO055 is a 0.5mm pitch LGA chip...
  8. joe_prince

    Overclocking to 96Mhz Question

    Pardon the seemingly obvious question, but how does the Teensy achieve overclocking to 96Mhz from a 16Mhz crystal? I understand how prescaling works with the crystal, to effectively "slow down" the clock counting to a more usable range, but how does increasing the clock's resolution take place...
  9. joe_prince

    Debug Techniques Needed

    This is an issue I've run into before, and couldn't find a solution prior, so I'm hoping someone has an idea. The question is in regards to debugging (e.g., printing values to the serial monitor) with programs that have high refresh rates and can't afford to be slowed down by the debug prints...
  10. joe_prince

    BNO055 Gyro Update Rate

    I have a question regarding the update rate of the gyro when using the NDOF mode on the BNO055 chip. Here is a link to the datasheet for reference: http://www.adafruit.com/datasheets/BST_BNO055_DS000_12.pdf When using the fusion mode NDOF (which is the mode that fuses the gyroscope...
  11. joe_prince

    Using External Power and USB Hack

    I just wanted to share a quick little hack I use to get around the issue of having to cut the solder pads on the back of the Teensy when using external power. As mentioned by Paul on the following page (https://www.pjrc.com/teensy/external_power.html), one option is to cut open a USB cable and...
  12. joe_prince

    LabVIEW Support for Teensy 3.1

    I've used Arduino many times in LabVIEW, and was hoping there would also be support for Teensy. Upon researching online I've found that it's currently not available for T3.x, while it is available for T2.x. Has anyone been able to integrate a Teensy 3.x into LabVIEW, other than doing serial...
  13. joe_prince

    Extract Image Data from GoPro

    I have been unable to find any information online unfortunately (perhaps I'm not searching for the right keywords), but I'm trying to extract the image data from a GoPro camera (Hero3) and read it into the T3, possibly via the video line from the Mini USB port. I would like to take a snapshot...
  14. joe_prince

    xBee not working with Teensy 3.1

    I'm having an issue when trying to use 2 xBees with the Teensy. Eventually I will need 2-way communication (for telemetry on the quadcopter), but for now I'm just trying to get simple 1-way communication to work. Below is the bill of materials list for the circuit: - Teensy 3.1 - xBee Series 2...
  15. joe_prince

    online custom PCBs in the United States

    Does anyone know of a good online distributor to have custom PCBs printed, preferably in the United States? I've ordered from Fritzing Fab before (http://fab.fritzing.org/fritzing-fab) but shipping times are quite long since they come from Germany.
  16. joe_prince

    Quadcopter BEC for Teensy

    I'm building a quadcopter that will use a Teensy 3.1 for the brain. The electronic speed controllers (ESCs) used to control the motors have built-in BECs that I can use to pull power from (which outputs 5V at 1A). I will only be using a handful of pins on the Teensy (e.g., 4 PWM pins to control...
  17. joe_prince

    transparent background for BMP file

    Has anyone been able to achieve a transparent background with a BMP image loaded onto a TFT LCD screen (e.g., http://www.adafruit.com/product/2090)? I'm working on a project where I will be creating a settings/controls menu GUI on the LCD screen and would like to design a set of icons as BMP...
  18. joe_prince

    Optimized ILI9341 Library Problem

    I'm having an issue when running the optimized ILI9341 library (ILI9341_t3) with a 2.8" TFT LCD on the Teensy 3.1. When uploading the example 'graphicstest' sketch, the LCD screen behaves normally and displays the graphics and text with no issues. However, after powering down the Teensy and...
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