User`s guide

Figure 6-4: IDC10 male headers enable easy
connection with mikroElektronika accessory boards
connectivity
page 19
Headers Buttons LEDs
LED (Light-Emitting
Diode) is a highly
ecient electronic
light source. When
connecting LEDs,
it is necessary to
place a current
limiting resistor in
series so that LEDs
are provided with
the current value
specied by the manufacturer. A common LED diode
voltage is approximately 2.5V, while the current varies
from 0.2mA to 20mA, depending on the type of the LED.
The EasyMx PRO
™
v7 board uses low-current LEDs with
typical current consumption
of 0.2mA or 0.3mA. Board
contains 72 LEDs which
can be used for visual
indication of the logic state
on PORT pins. An active LED
indicates that a logic high
(1) is present on the pin. In
order to enable PORT LEDs,
it is necessary to enable the
corresponding DIP switch on
SW15 (Figure 6-6).
Figure 6-6: SW15.1
through SW15.8
switches are used to
enable PORT LEDs
53
55
57
59
61
63
65
67
69
71
73
75
77
54
56
58
60
62
64
66
68
70
72
74
76
78
PC5
SMD LED
SMD resistor
limiting current
through the LED
The logic state of all
microcontroller digital
inputs may be changed
using push buttons. Tri-
state DIP switch SW16
is available for selecting
which logic state will
be applied to corresponding MCU pin when button is
pressed, for each I/O port separately. If you, for example,
place SW16.5 in VCC position, then pressing of any push
button in PORTE I/O group will apply logical one to the
appropriate microcontroller pin The same goes for GND.
If the DIP switch is in the middle position, then all push
buttons of the associated PORT will be disconnected from
the microcontroller pin. You can disable pin protection
220ohm resistors by placing jumpers J6 and J7, which
will connect your push buttons directly to VCC or GND. Be
aware that doing so you may accidentally damage MCU in
case of wrong usage.
Reset Button
In the far upper right section of the
board, there is a RESET button, which
can be used to manually reset the
microcontroller.
Figure 6-5: Button press
level DIP switch (tri-state)
With enhanced connectivity as one of the key features
of EasyMx PRO
™
v7, we have provided two connection
headers for each PORT. I/O PORT group contains one
male IDC10 2x5 header (like CN24 Figure 6-3). There
is one more IDC10 header available on the right side
of the board, next to DIP switches. These headers
can be used to connect accessory boards with IDC10
female sockets.
EasyMx PRO
v7