Choosing a Push Button Switch: A Simple Guide

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The following are some simple methods for your reference to choose a Push Button Switch.

1. Purpose and Application

Begin by understanding the purpose and application of the push button switch. Different switches are designed for various functions, such as momentary or latching actions. Determine whether the switch will be used for power control, signal activation, or other specific tasks.

2. Type of Operation

Push button switches can be categorized into momentary and latching types. Momentary switches return to their original state when released, while latching switches stay in the on/off position until manually changed. Choose the type that best suits your device's requirements.

3. Contact Configuration

The contact configuration refers to the number of electrical contacts in the switch. Common configurations include single-pole single-throw (SPST) and double-pole double-throw (DPDT). Consider how many circuits the switch needs to control and select the appropriate contact configuration.

4. Size and Mounting

The physical size and mounting style of the switch are important for integration into your device. Choose a switch that fits comfortably within the available space and can be easily mounted using screws, snap-in mechanisms, or other suitable methods.

5. Actuator Design

The actuator is the part of the switch that users press. It comes in various shapes, sizes, and colors. Opt for an actuator design that is ergonomic and matches the user's interaction preferences. Consider factors like button shape, size, and tactile feedback.

6. Electrical Rating

Ensure the switch's electrical rating is compatible with your device's requirements. This includes considerations such as voltage and current ratings. Choosing a switch with the right electrical rating prevents overheating and ensures safety.

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7. Environmental Conditions

Consider the operating environment of your device. If it will be used outdoors or in harsh conditions, select a push button switch with appropriate sealing and protection against dust, water, and other elements.

8. Longevity and Durability

Quality matters when it comes to push button switches. Look for switches from reputable manufacturers known for producing durable and long-lasting components. This helps prevent premature failures and ensures a reliable user experience.

9. Aesthetic Appeal

While functionality is key, the switch's appearance shouldn't be overlooked, especially in consumer-facing products. Choose a switch that aligns with the overall design and aesthetics of your device.

10. Compliance and Certifications

If your device needs to meet certain industry standards or regulations, ensure that the chosen push button switch complies with the necessary certifications, such as UL, CE, or RoHS.

In conclusion, choosing a push button switch involves considering factors like the switch's purpose, type of operation, contact configuration, size, actuator design, electrical rating, environmental conditions, durability, aesthetics, and compliance. By carefully evaluating these factors, you can select the right push button switch to enhance the functionality and user experience of your electronic device or system.

Introduction: Using the Pololu Pushbutton Power Switch

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About: Father of two active toddlers desperately trying to find the time to build every interesting project from Instructables. Slowly training the kids to love building things. The wife? She thinks we are all crazy.&#;

I am working on a project ( Instructable soon to be published) which required the Arduino controller to be powered down once a program had been run and restarted at the push of a button. The Pololu Pushbutton Power Switch fit my needs perfectly. This device was so easy to use and has so much potential in other projects I thought I would do a quick write-up in the hopes of helping others.

I use the Arduino as an example, but many other configurations are possible.

Step 1: The Pinouts

I am using the low voltage version which can handle 2.5-7 volts. The standard version can handle 4.5-20 volts. A small switch is provided, but any momentary on switch can be used.

The pinouts of the switch are pretty straight forward. There are two pins for Voltage In (VIN), two for Voltage Out (VOUT), four for ground (GND) and one pin marked OFF.

Step 2: Wiring It Up

In my project, I have a battery pack powering my Arduino. The switch is installed between the power source and the Arduino. Positive voltage from the battery pack is wired to a voltage in (VIN) pin. Negative to a ground (GND) pin. On the arduino side, the VOUT goes to the center pin of a male power plug and the GND to the barrel of the same plug.

The key to this switch function is the OFF pin. Here, I have it wired to pin 7 of the Arduino.

Step 3: And Then Magic Happens...

At this point the switch will function as a push on/ push off switch for the Arduino. With a little code, the Arduino can switch itself off at an appropriate time! All that is required is setting pin 7 (in this example) to HIGH and the Pololu switch powers the Arduino down.

Here is some example arduino code:

int offPin = 7;           // Pololu connected to digital pin 7

void setup()
{
  pinMode(offPin, OUTPUT);  // sets the digital pin as output
}
void loop()
{
  delay();            // wait for 30 seconds
  digitalWrite(offPin, HIGH);   // Sets the pin to HIGH and shuts down the Arduino
}

I hope you have found this useful. Please post in the comments if you use one of these in a project.

For more information, please visit me- limit switch wiring diagram.