Glass TouchKeypad and IchigoJam part2

A Glass Touch Keypad and IchigoJam Trial 2

IchigoJam と　ガラス　タッチキーパッド　I2C接続

 



Key pads are formed with Aluminum fine pattern
Lower resistance than ITO

Continuous work after Dec10 2015 post

 

This time, the glass touch keypad worked.

Touch controller : Atmel AT42QT2120

 

Set up - put a printed sheet underneath the glass keypad.

 

 

 

 

 

 

 

 

 

 

1. Wiring(5)

I2C connection to the IchigoJam

 SDA--->IN3

 SCL---->EX1

 

 /Change---IN1        (Watch status change) normally "H"

I2C Address  0x1C   (Fixed)
 

VCC--3.3V

GND--GND

2. Initialize of AT42QT2120(Atmel sensor driver chip)

Reset  "/Change "   L to H      (Normally H but L at turn-on)

First thing to do;
Reset the chip!   This was a bit tricky.

 

Send reset command   0x07,0xFF(any nonzero value)

wait 500msec. (250msec Min?)

Dummy status read from the chip (I did this but not shown in the spec)

3. Read Keydata

Check  any key detection status change "/Change"

  Wait /Change  H->L

or

  Read sensor detection status (0x02)

 

Read data command   0x03

   data  D7,D6,----D0

Read data command  0x04

   data  x,x,x,x,D11,D10,D9,D8

 

Note;

I saw no key data even when "/Change" became L.

I just ignored null data.
 

4. Convert data to Key number

The order of  leadout from the glass keypad is not

the same as sensor chip input/output numbering.

I had to convert the sensor data by the following

order.

 

Glass keypad 1,2, 3, 4, 5,6, 7,8,9,10,11,12

sensor data    1,0,11,10,2,4,7,9,3, 5, 6, 8

Multi-touch can be read.
 

 5. Other settings

This Atmel chip can be set in various sensing mode.

For the pratical use it might be needed.

6. Trial kit

This kit is not  being sold, but free samples are available both in the US and Japan(Tech Support)
I'll provide some samples for the educational /leaarning purposes.



7. Atmel AT42QT2120



AT42QT2120 PCB for Glass touch keypad

Comm Mode : 1 to 12 keys, 1-9 wheel or slider

Standalone Mode:1 to 5 keys

 



Reference of pin numbers and Key number

I2C Test: TouchKey Display and IchigoJam

I2C Test :TouchKey Display Module and IchigoJam

IchigoJam とGU-D ModuleをI2Cで接続してみた

GU140X32F-D903S

140x32 dot matrix VFD with 8x2  Capacitive touch keypad 

1. IchigoJam a BASIC computor for kids

What is  the "IchigoJam";

LPC1114 based MCU board includes, Basic interpreter on chip, NTSC video output, PS2 Keyboard input,Digital/Analog I/O, UART,I2C..

 

Note:IchigoJam Basic uses "# "showing hex data "h"

2. I2C Connection to the IchigoJam

SDA: IN3

SCL:  EXT

 

Connection: GU-D Module

SDA:  PIN2

SCL:   PIN5

I2C Addr   50h (can be selected)

3. IchigoJam BASIC command

1) Write message data thru I2C

POKE #700,........         Store Module command

POKE #703,.........        Store message data ASCII

An example for IchigoJam BASIC command for I2C write

I2CW(#50,#700,3,#703,7)

Send the data 3bytes from Addr 700h as a command and send 7bytes from 703h as message data.

 

2) Read Key data

POKE #710,#1f,#48,#10........   Store Module command to read data
 

I2CR(#50,#710,3,#720,4)    :  
Send the command (#10) for "All Touch SW Status Read" , 3bytes from 710h.
Save read 4bytes data to 720h---723h.
 

3) Result

Read data form the module  in #720,#721,#722,#723

 

#720 : Function Id (#10)       (Just confirm the sent command data)

#721 : Data Length (2)         (Tell how many bytes sent)

#722 : Keydata  (SW16-9)

#723:  Keydata  (SW8-1)

 

4. Display functions of Module :GU140X32F-D903S

1) How to indicate your  message on the module screen :Refer the spec for detail

Just send ASCII data or Bitmap to  the module ,no need to use libraries to display simple text and bitmap.

 

Display control commands

Bitmap memory

international character fonts incl Asian fonts

Macro programming

 

Connection

GU140X32F-D903F

 

Result: Data read from Module

 

IchigoJam Monitor with GU140X32F-D903S



-Reference-

Display GU140X32F-D903S information

 

タッチキーパッド キット(Touch Keypad Kit)

Glass Touch Keypad Kit　

限定配布品(市販されていません）

3x4　ガラスキーパッド
キーセンサーチップボード
センサーチップ Atmel AT42QT2120

 

 ガラスキーパッド　

3x4の透明電極が、個別に引き出されています。

 

透明電極は、一般的なITO膜ではありません。

アルミ薄膜の微細線でメッシュ状に形成されています。

抵抗値が低く、均一な感度が実現できます。

基板は、ガラスです。強化加工はしてありません。

ガラスの下に、絵や文字を書いた紙、LEDなどを入れることができます。

 

 

 

 

 

センサー基板回路

Atmel AT42QT2120を使っています。

12keyの状態が、I2Cで読みだせます。

詳細動作仕様は、I2C経由で設定できます。

 



 

 

 

 

例：キーをプリントした紙を下に入れた