MIKROE-798 mikroElektronika, MIKROE-798 Datasheet - Page 26

• Manufacturer Part Number: MIKROE-798
• Description: Development Boards & Kits - PIC / DSPIC EASYPIC v7 DEVELOPMENT SYSTEM
• Manufacturer: mikroElektronika

Specifications of MIKROE-798

• Rohs: yes
• Product: Development Boards
• Tool Is For Evaluation Of: PIC18F45K22
• Core: PIC
• Interface Type: RS-232, USB
• Operating Supply Voltage: 5 V
• Description/function: Development board only, touch screen, pencil, DS1820, LCD, serial cable, GLCD not included
• Dimensions: 266 mm x 220 mm

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Figure 13-4: Touch Panel
controller and connection
schematic
CN29
DATA BUS
1
RA0
RA1
RC0
RC1
SW3
Figure 13-1: Put Touch panel flat cable in
the connector
20
BOTTOM
DRIVEA
DRIVEB
GLCD SOCKET2
LEFT
Correctly placing the touch panel cable into the connector
is how touch panels can be used as an input devices.
CN6
measure that pressure and pinpoint its location. This
onto the inner layer and appropriate controllers can
the screen is pressed, the outer layer is pushed
covered with two layers of resistive material. When
RIGHT
TOP
Touch panel is a glass panel whose surface is
LEFT
BOTTOM
Touch panel controller
VCC-MCU
R25
100K
R26
100K
Q15
BC856
Q14
BC856
VCC-MCU
C25
100nF
C26
100nF
R22
10K
Q12
BC846
Q16
BC846
R14
10K
R16
1K
Q13
BC846
R15
10K
R45
10K
R24
10K
VCC-MCU
VCC-MCU
VCC-MCU
R23
1K
R12
1K
BOTTOM
E3
10uF
DRIVEA
DRIVEB
LEFT
1
Figure 13-2: Use a tip of your finger
to push it inside
Enabling Touch panel
Touch panel is enabled using SW3.5,
SW3.6, SW3.7 and SW3.8 switches.
They connect READ-X and READ-Y lines
of the touch panel with RA0 and RA1
analog inputs, and DRIVEA and DRIVEB
with RC0 and RC1 digital outputs on
microcontroller sockets. Make sure to
disconnect other peripherals, LEDs and
additional pull-up or pull-down resistors
from the interface lines in order not to
interfere with signal/data integrity.
EasyPIC
and connector for 4-wire resistive touch panels. It
can very accurately register pressure at a specific point,
representing the touch coordinates in the form of analog
voltages, which can then be easily converted to X and Y
values. Touch panel comes as a part of display.
™
v7 is equipped with touch panel controller
2
Figure 13-3: Now place GLCD with
Touch panel into GLCD socket
Figure 13-5: Turn on switches
5 through 8 on SW3 to enable
Touch panel controller
3