Button Y Click
PID: MIKROE‐3262
Weight: 30 g
Button Y click is a Click board™ equipped with the tactile switch, sometimes referred to
as a pushbutton. A pushbutton is a component that is used very often in various
designs, allowing the user to interact with the application. Although it sounds simple, a
button needs to comply with a range of application requirements. It needs to have a
very good mechanical endurance while retaining its specifications, a predictable
bouncing time, a very low ON resistance, very high OFF resistance, and it needs to fulfill
aesthetical requirements.
It comes in the package which also includes the mikroSDK™ software and a library with
all the functions. The Click board™ comes as a fully tested and approved prototype,
making it a reliable device ready to use on the development board.
The button used on the Button Y click meets all the menitoned requirements. It is a
reliable and endurable tactile switch, with a reasonably large button surface of 6.7mm in
diameter. Very low typical bouncing time of less than 1.5ms, extremely low ON
resistance of less than 100mΩ, and an embedded yellow LED with the adjustable
brightness are features that make the Button Y click very appealing tactile switch
solution, which can be used in many different low power electronic applications, such as
various control boards, user input keys, activators of certain functions with built-in
signalization, etc.
How does it work?
Button Y click is equipped with the high-quality, single-pole, single-throw (SPST) tactile
switch labeled as 3006.2111, produced by Marquardt. This is a high-quality, low-profile
pushbutton with a reasonably large diameter of 6.8mm. It is equipped with a yellow LED,
which can be dimmed by applying a PWM signal from the MCU. Therefore, the anode of
the LED is connected to the PWM pin of the mikroBUS™. The embedded LED can be
used for a signalization, but also for aesthetic purposes.
The switch itself has very good characteristics: it has a low ON resistance (a resistance
through the button while it is pressed) of less than 100mΩ, very low bouncing time (a
time during which the contact plates settle down) of less than 1.5ms typically. The
mechanical endurance of the tactile switch is rated to more than 500,000 cycles, while
applying 14VDC, 10mA. The total travel distance of the button is 2.9 mm, while the
tactile force of the button is 4N. The maximum voltage that should be used between the
switch terminals is 28V, while the current should stay below 50mA.
Two important properties that describe a button, are its mechanical endurance and
bouncing delay. Those two attributes depend on each other, so when a significant
bouncing appears, it might be a sign of a switch deterioration. Likewise, a switch will
develop larger bouncing effect as it is been used over time. The mechanical endurance
is also affected by the force applied to the switch while operated, as well as its
eccentricity (pressing the button off center).
Bouncing time is a parameter which describes how fast contact plates of a switch are
settled down. Each material has some elastic properties. This is also true for the contact
plates of the button. Different types of switches have different mechanism to establish a
contact, but they are all based on a common principle: they are made so they
accumulate the pressure force, until there is enough energy stored so that the plate can
be actuated very fast, turning the accumulated pressure into kinetic energy (resulting
with the familiar click sound). The most often, a form of spring mechanism is used.
However, when hitting the second, fixed plate, a moving plate will bounce off a few
times, depending on the elasticity of the system, its speed and so on. There is no ideal
dampening mechanism to reduce the bouncing completely. This button will accumulate
force up to about 1N before its actuated, providing a tactile feedback while clicking.
The tactile switch used on Button Y click has an excellent bouncing duration of less than
1ms. However small, the bouncing of a button needs to be compensated, either in the
application firmware, or the hardware. Button Y click has a simple debouncing circuit,
made of a 10kΩ resistor and 10nF capacitor, which is sufficient for the most cases. The
debounced signal will have a small delay, depending on a dampening circuitry. The
delay is in the range of a few milliseconds, which is far less than a human can sense.
Finally, the button is intended to be operated by a human, so even much larger delay is
perfectly acceptable for this type of device.
The button is active HIGH, which means that when it is pressed, a HIGH logic level will
be applied to the INT pin. This switch will be pulled to a LOW logic level by the 10kΩ
pull-down resistor while inactive, preventing the input pin of the MCU to become
floating. The switch signal is routed to the INT pin of the mikroBUS™. An onboard SMD
jumper labeled as VCC SEL is used to set the voltage for the HIGH logic level, allowing
the Button Y click to be used with a wide range of different MCUs.
Specifications
Type
Button
Button Y click very appealing tactile switch solution, which can be used in
Applications
many different low power electronic applications, such as various control
boards, user input keys, activators of certain functions with built-in
signalization, etc.
On-board
modules
3006.2111, a high-quality SPST tactile switch, produced by Marquardt
Excellent mechanical endurance, integrated yellow LED with the adjustable
Key Features
brightness, very low ON resistance, comes equipped with the debouncing
circuit
Interface
GPIO,PWM
Input Voltage
3.3V or 5V
Click board
size
M (42.9 x 25.4 mm)
Pinout diagram
This table shows how the pinout on Button Y Click corresponds to the pinout on the
mikroBUS™ socket (the latter shown in the two middle columns).
Notes
Pin
NC
1
AN
PWM
16
Pin
Notes
PWM
LED intensity
NC
2
RST
INT
15
INT
Switch OUT
NC
3
CS
RX
14
NC
NC
4
SCK
TX
13
NC
NC
5
MISO
SCL
12
NC
NC
6
MOSI
SDA
11
NC
Power supply
3V3
7
3.3V
5V
10
5V
Power Supply
Ground
GND
8
GND
GND
9
GND
Ground
Onboard settings and indicators
Label
Name
Default
Description
PWR
PWR
-
Power LED indicator
JP1
VCC SEL
Left
Logic voltage level selection: left position 3.3V, right
position 5V
Software support
We provide a library for the Button Y click on our LibStock page, as well as a demo
application (example), developed using MikroElektronika compilers. The demo can run
on all the main MikroElektronika development boards.
Library Description
The library contains a function that checks and returns the state of the button - whether
it is pressed or not. Using the PWM function, you can adjust the LED light button.
Key functions:
uint8_t buttony_getButtonState() - Functions for Get Button state
Examples description
The application is composed of the three sections :
System Initialization - Sets INT pin ad INPUT
Application Initialization - Initialization driver init and PWM init
Application Task - (code snippet) - Check if the button is pressed. If it is, logs a message to
USBUART and lights up the light on 2 clocks.
void applicationTask()
{
buttonState = buttony_getButtonState();
if ((buttonState == _BUTTONY_BUTTON_IS_PRESSED) && (_pressFlag == 0))
{
_pressFlag = 1;
}
if (_pressFlag == 0)
{
_dutyCycle += 250;
buttony_pwmSetDuty(_dutyCycle);
if (_dutyCycle > 10000 )
{
_dutyCycle = 0;
buttony_pwmSetDuty(_dutyCycle);
Delay_ms(2000);
}
Delay_ms( 50 );
}
else
{
if(buttonState == _BUTTONY_BUTTON_IS_PRESSED)
{
mikrobus_logWrite(" Button is pressed ", _LOG_LINE);
buttony_pwmSetDuty(10000);
Delay_ms( 2000 );
}
else
{
buttony_pwmSetDuty(0);
}
}
}
The full application code, and ready to use projects can be found on our LibStock page.
Other mikroE Libraries used in the example:
PWM
Additional notes and information
Depending on the development board you are using, you may need USB UART
click, USB UART 2 click or RS232 click to connect to your PC, for development systems
with no UART to USB interface available on the board. The terminal available in all
MikroElektronika compilers, or any other terminal application of your choice, can be
used to read the message.
mikroSDK
This click board is supported with mikroSDK - MikroElektronika Software Development
Kit. To ensure proper operation of mikroSDK compliant click board demo applications,
mikroSDK should be downloaded from the LibStock and installed for the compiler you
are using.
For more information about mikroSDK, visit the official page.
https://www.mikroe.com/button‐y‐click/12‐6‐18
