Hardware Specifications

Figure 1. Amulet Easy GUI 3.8" board assembly, component side.

PCB Size:	4.25" x 3.58"
LCD:	Chip-on-glass, 3.48" x 2.72" (3.8" diagonal); 320 x 240, monochrome, black on white; viewable area 3.14" x 2.39" (76.79 x 57.59mm)
Dot Pitch:	0.24 x 0.24mm
Dot Size:	0.225 x 0.225mm
Touch Screen:	4-wire resistive analog; active area is 80 x 62mm; utilizes full 320 x 240. NOTE: Since the touch screen is touch activated, do NOT allow your mounting hardware to apply any compression forces inside the active area!
Backlight:	LED Rimshot, always ON adjustable brightness.
Operating Temp.:	-10° to 60°C; rh>65% non-condensing
Storage Temp.:	-20° to 70°C
Power:	5 to 10 VDC @100mA (9-volt battery and adapter supplied)
SRAM:	128k-Bytes
Flash:	One 128k-Bytes (64k-Bytes available)
Serial Port:	One RS-232, 9-pin DIN, up to 115.2 Kbps

DIP Switch Settings

Boot Mode (DIP switch 1) -- This switch is monitored during a reboot to determine the operational mode of the controller board; ON is the normal mode and OFF is the FLASH program mode. Upon clicking on the Program FLASH button in the Compiler window, the Compiler will attempt to send out an auto "wake-up" message to the Amulet controller. If the page currently being displayed is set up to use the same baud rate using the META tag (if META is not present, the default is 115200) as the Compiler's uP comm rate, then the Amulet controller will change to a generic "Please wait while programming flash..." screen and commence programming. If the page has a baud rate different than what the Compiler is set to, then you should set the uP comm rate in the Settings->RS232 dialog box to match the baud rate set by the META tag. This will allow the HTMLCompiler to wake up the Amulet at one baud rate and then program it at another baud rate. The only time you should have to set Switch 1 to OFF (program mode) is when the project you compiled locks up the Amulet OS to the point where it won't accept the wake up message or if the Amulet OS has been corrupted and you need to reload the OS.

Program Baud Rate (DIP switch 2) -- This switch sets the baud rate used during a Flash Reprogram. The ON position sets the hardware to 19,200 baud; OFF sets the hardware to 115,200 baud. This setting must match the baud rate selected in the Easy GUI HTMLCompiler software.

RAM Test (DIP switch 3) -- Turn this switch ON and then reboot the controller board to auto-execute a RAM test. A RAM test failure will result in a zero (0) volt signal on the MEM PASS test pad on the board; a pass will result in a 3.3 volt signal. The switch must be returned to the normal mode (OFF) before the next reboot to continue normal operation.

Touch Panel Mode (DIP switch 4) -- This switch should remain ON during normal operation. Turn this switch OFF and then reboot the controller board to begin a touch panel calibration. The controller will display a series of three calibration targets. Use a stylus to touch the center of each target. If necessary, the controller will repeat the calibration. When calibration is complete, the controller will return to normal operation. The switch must be returned to the normal mode (ON) before the next reboot to continue normal operation.

Power Supply and Reset

CAUTION: Do not reverse the polarity on the power input. Doing so will permanently damage the module and invalidate your warranty.

Figure 2. Power Input Power is applied to the 1.3mm connector.
Power requirement 5 to 10 VDC @100mA

Reset Switch -- This momentary pushbutton switch resets the Easy GUI controller chip as well as LCD power.

RS-232 Specs

• Pin 1 - N/C
• Pin 2 - TX (Amulet GUI module transmits data on Pin 2 while the PC receives data on Pin 2)
• Pin 3 - RX (Amulet GUI module receives data on Pin 3 while the PC transmits data on Pin 3)
• Pin 4 to 6 - Jumpered
• Pin 5 - Ground
• Pin 7 to 8 - Jumpered
• Pin 9 - N/C

The serial parameters for communications between the Easy GUI client and the server are, as follows:

Baud Rate: 9600, 19200, 57600, or 115200bps
Parity: None
Data Bits: 8
Stop Bits: 1

See Communications Protocol for more information.

Touch Panel Calibration

Although the touch panel is factory calibrated, you may need to recalibrate it from time to time. The calibration data is stored in a FLASH ROM location called the Operating System (OS) resource segment. For this reason, you must always recalibrate the touch panel after restoring or updating the OS. To perform a touch panel calibration through hardware, proceed as follows:

1. Make sure that the DIP switch settings on SW2 are as follows:

   Switch 1 ON — Boot Mode
   Switch 2 OFF — Flash Mode Baud Rate
   Switch 3 OFF — RAM Test
   Switch 4 OFF — Touch Panel Mode

2. Press the Reset Switch to reboot the board. The board reboots in the calibration mode.
3. A series of three targets appear on the LCD.  The first two targets are x and y calibration targets.  Using a touch screen stylus, touch the center of each target as it appears.  (A stylus was included in the starter kit.) As a target is touched, the next target is displayed.
4. The third target is a calibration "check" target. Unlike the first two targets, this target appears momentarily pressed while touched. Depending on how you remove the stylus from this target, the calibration will either restart, or the calibration will end. To check calibration accuracy, move the stylus within the center of the target with a continuous touch, and then move the stylus off the edge of the target image. A well-calibrated target will remain pressed with the stylus in the center area, and should return to its pre-pressed state as the stylus moves off the edge of the target.
5. If the calibration is satisfactory, release the stylus anywhere within the target.  (The unit will proceed to the GUI Home Page.)  If the calibration is NOT satisfactory, release the stylus anywhere outside the target to restart the calibration.
6. Make sure you return the Touch Panel Mode DIP switch (Switch 4) to the Normal Mode (ON) before you reset or restart the board.  If not, the board will restart in the touch screen calibration mode.

Touchscreen calibration can also be entered via software, by using the Amulet:calibrate() function call. See the calibrate example for more information.

Module Assembly Drawing, Easy GUI 3.8" Starter Kit