Project Logs

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• Max232 and DB9

  TJ • 12/16/2014 at 17:58 • 0 comments

  I'm working on the max232 integration and the DB9 connector.

  And it's good Rx and Tx are ok.

  I'm adding RTS, CTS and I'll try to flash it using USB-RS232 cable

• Analog parts

  TJ • 12/15/2014 at 12:21 • 0 comments

  I've added the possibility to analyze and view A0 and A1 trinket pins on the screen.

  A0 & A1 can be used as inputs, inputs pullups and/or outputs.

  IN: input / OU: output / UN: unused

  3 modes (A0==UN && A1==UN not a possible case):

  1. Input mode : (A0 == IN && A1 == IN) || (A0 == IN && A1 == UN) || (A0 == UN && A1 == IN)
  2. Output mode : (A0 == OU && A1==OU) || (A0 == OU && A1 == UN) || (A0 == UN && A1 == OU)
  3. Mixed mode : (A0 == OU && A1==IN) || (A0 == IN && A1 == OU)

  
  

  Oscilloscope screen works :)

• Serial configuration

  TJ • 12/10/2014 at 20:54 • 0 comments

  ATmega 328p datasheet extract
  

  http://arduino.cc/en/Serial/begin
  

  The firmware will support:

  • Speed: 300 / 1.2k / 2.4k / 4.8k / 9.6k / 19.2k / 38.4k / 57.5k / 115.2k / 230.4k / 460.8k / 500k / 576k / 921.6k / 1M / manual value between 300 and 1M
  • Data / parity / stopbits:
    • None parity:
      
      • 5N1
      • 6N1
      • 7N1
      • 8N1
      • 5N2
      • 6N2
      • 7N2
      • 8N2
    • Even parity:
      • 5E1
      • 6E1
      • 7E1
      • 8E1
      • 5E2
      • 6E2
      • 7E2
      • 8E2
    • Odd parity:
      • 5O1
      • 6O1
      • 7O1
      • 8O1
      • 5O2
      • 6O2
      • 7O2
      • 8O2

• Battery powered

  TJ • 12/10/2014 at 15:59 • 0 comments

  At the moment, the trinket is powered by battery :)

  Left to right: Trinket, battery level switch, charge/battery platform, 4 switchs (Rx/Tx/RTS /CTS to select TTL and/or RS232 level on each line)
  

  Middle right: Trinket power switch (On/Off)

• Main PCB board

  TJ • 12/09/2014 at 20:14 • 0 comments

  Cut protoboard

  With screen mounts, trinket and charge/5V module

• Screen holder test

  TJ • 12/09/2014 at 11:52 • 0 comments

  I'm now 3D printing a screen holder test part. (ABS)

  It's good. I have now the good screen size.

• Serial test

  TJ • 12/04/2014 at 21:20 • 0 comments

  Computer (Minicom) => USB-FTDI <=> Rx/Tx <= Trinket (Screen)

  Computer:

  TSPT

• Trinket and screen test

  TJ • 12/03/2014 at 18:36 • 0 comments

  I'll use it in SPI mode, so I have to solder closed IM1 IM2 and IM3 bridges (not IM0)

  Screen pinout	Trinket pinout
  GND	G
  Vin	5V
  3Vo	N.C.
  CLK	13
  MISO	12
  MOSI	11
  CS	10
  D/C	9
  RST	RST
  Lite	N.C.
  GND	N.C.
  IRQ	N.C.
  SDA	A4
  SCL	A5
  IM3	N.C.
  IM2	N.C.
  IM1	N.C.
  IM0	N.C.
  CSS	4
  CD	N.C.

  It works :)

• Pro Trinket 5V

  TJ • 12/03/2014 at 18:33 • 0 comments

• Screen 2.8"

  TJ • 12/03/2014 at 16:48 • 0 comments

  Size: 82mm * 62mm * 8mm

  Useful: https://learn.adafruit.com/adafruit-2-dot-8-color-tft-touchscreen-breakout-v2

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