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The new Teensy boards (v 3.5 & 3.6)

Posted by admin |

Teensy 3.5 & 3.6 by Paul Stoffregen — Kickstarter

Teensy are Arduino compatible microprocessor boards with a bit more oomph than Arduino. The new Teensies run on an ARM processor and at clock speeds above 100 MHz, while still beeing teensy in size.

The new Teens boards have a dedicated cryptographic co-processor that according to the PDFs linked below supports acceleration of the DES, 3DES, AES, MD5, SHA-1, and SHA-256 algorithms. So basically cryptographic hasing (SHA-256) and symmetric crypto (AES).


From the kickstarter page:

Technical Features & Specifications

Features specific to Teensy 3.6:

  • 180 MHz ARM Cortex-M4 with Floating Point Unit
  • 1M Flash, 256K RAM, 4K EEPROM
  • Microcontroller Chip MK66FX1M0VMD18 (PDF link)
  • USB High Speed (480 Mbit/sec) Port
  • 2 CAN Bus Ports
  • 32 General Purpose DMA Channels
  • 22 PWM Outputs
  • 4 I2C Ports
  • 11 Touch Sensing Inputs

Features specific to Teensy 3.5:

  • 120 MHz ARM Cortex-M4 with Floating Point Unit
  • 512K Flash, 192K RAM, 4K EEPROM
  • Microcontroller Chip MK64FX512VMD12 (PDF link)
  • 1 CAN Bus Port
  • 16 General Purpose DMA Channels
  • 5 Volt Tolerance On All Digital I/O Pins

Features common to both:

  • 62 I/O Pins (42 breadboard friendly)
  • 25 Analog Inputs to 2 ADCs with 13 bits resolution
  • 2 Analog Outputs (DACs) with 12 bit resolution
  • 20 PWM Outputs (Teensy 3.6 has 22 PWM)
  • USB Full Speed (12 Mbit/sec) Port
  • Ethernet mac, capable of full 100 Mbit/sec speed
  • Native (4 bit SDIO) micro SD card port
  • I2S Audio Port, 4 Channel Digital Audio Input & Output
  • 14 Hardware Timers
  • Cryptographic Acceleration Unit
  • Random Number Generator
  • CRC Computation Unit
  • 6 Serial Ports (2 with FIFO & Fast Baud Rates)
  • 3 SPI Ports (1 with FIFO)
  • 3 I2C Ports (Teensy 3.6 has a 4th I2C port)
  • Real Time Clock
Oct 01, 2016 11:05

Running scripts with passwordless sudo

Posted by admin |

Quoted from the page  (Ubuntu ):

Shutting Down From The Console Without A Password

Often people want to be able to shut their computers down without requiring a password to do so. This is particularly useful in media PCs where you want to be able to use the shutdown command in the media centre to shutdown the whole computer.

To do this you need to add some cmnd aliases as follows:

Cmnd_Alias SHUTDOWN_CMDS = /sbin/poweroff, /sbin/halt, /sbin/reboot

You also need to add a user specification (at the end of the file after the "%admin ALL = (ALL) ALL" line so it takes effect - see above for details):


Obviously you need to replace "<your username>" with the username of the user who needs to be able to shutdown the pc without a password. You can use a user alias here as normal.


Read more: Link - Sudoers - Community Help Wiki

Oct 01, 2016 10:17

If your Acer Aspire V-573G is hard to start

Posted by admin |

That is, when you depress the start button on the left hand side, it sometimes has problem starting up, especially when not connected to mains, then in my experience you may need to get a new CR2032 battery on the mother board.

  • Remove the screws on the underside of the laptop
  • Pop off the bottom
  • Locate the battery (it's in the center)
  • Pop it out
  • Replace it with a new one

You should be grounded and it may be a good idea to disconnect the battery (the big one, not the coin cell we are talking about in this blog post) from the motherboard before beginning. The old CR2032 battery had a voltage of 2.94V as measured and a new one 3.04V. So maybe it started working better for another reason, or that difference is enough. Maybe the old one had an even lower voltage under load.

Sep 27, 2016 05:35

"Oh Snap!" in Chrome and crashing Firefox: SSD or Ubuntu 16.04?

Posted by admin |

One of my computers has for some time had the problem that tabs in Chrome get the "Oh snap!" message after a while, and Firefox just crashes mysteriously after many hours. This computer runs Ubuntu 16.10 and has an M2 SSD. Now my laptop is showing exactly the same behaviour, after having had an SSD installed.

I wonder if this is because the hardware isn't up to handling the speed of the SSD drives or if there is some kind of conflict between the SSD and the OS. I will slow down the SSD bus speed on the laptop and see if that helps.

Update 2016-12-31:

It helped!


Sep 20, 2016 10:55