Inaki Iturriaga
ARGENTINA • + Follow
Components
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ATTINY85V-10SUMicrochip Tech
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x 1 | |
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18mm Piezo |
x 1 | |
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18650 |
x 1 | |
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18650 battery holder |
x 1 | |
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SlideSwitch |
x 1 | |
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PushButton |
x 1 | |
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5v Step Up |
x 1 |
Tools, APP Software Used etc.
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arduino IDEArduino
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Soldering Iron Kit |
Description
Piezo Alert System.
Within the fast-evolving sphere of security tools and home automation, creativity often paves the way for enhancing safety and comfort. Introducing the "Unpress Alert", a nimble and efficient security alert mechanism. At its heart is the power and simplicity of the ATTiny85 microcontroller, and its mission is straightforward: alert the user when its button is released, a quintessential trait for detecting unauthorized access or movements.
Disclaimer:
The "Unpress Alert" system is primarily conceptualized for hobbyists and DIY security implementations. Ensure you understand its capabilities and limitations. Abide by safety guidelines during construction and deployment, to prevent any unforeseen consequences.
Potential Applications:
- Security Monitoring: Place the device in a desired location—be it a drawer, a bookshelf, or a jewelry box. The moment it's disturbed, you get an alert.
- Safety Checks: The system can be used to monitor restricted areas or objects, sending out an alert the moment the button is released.
- Training and Behavior Reinforcement: Use it as a tool to reinforce certain behavioral patterns, alerting when a set boundary is crossed.
Building Guide - The Unpress Alert System:
Gather the Necessary Tools and Materials:
You will need:
- An ATTiny85 microcontroller
- Piezo buzzer
- Push button
- Breadboard or PCB (depending on your design preference)
- Soldering iron, solder, flux
- Tweezers or small pliers
- Battery holder or power source for the ATTiny85
Assembly:
- Prepare Your Working Space: Ensure you have a clean and well-lit area, free from potential distractions.
- Insert the ATTiny85: Whether you're using a breadboard for prototyping or a PCB for a more permanent build, start by inserting the ATTiny85, ensuring the pins are in their correct orientation.
- Connect the Piezo Buzzer: Attach one end of the piezo buzzer to pin 0 of the ATTiny85, and the other end to the ground.
- Set Up the Push Button: Connect one terminal of the push button to pin 4 of the ATTiny85. The other terminal should go to the ground.
- Powering the Device: Connect your power source or battery holder to the VCC and GND pins of the ATTiny85.
- Soldering (if using a PCB): If you've opted for a PCB layout, carefully solder each component in place. Ensure each connection is solid, free from shorts, and then clean the board.
- Testing: Before deploying, test the system by pressing and releasing the button. Upon release, the piezo should emit the alarm sound.
- Programming the ATTiny85:
- The core of this device's functionality is the code loaded onto the ATTiny85. Use the provided code to detect the button release and trigger the piezo buzzer. Ensure that you have the right environment set up for programming the ATTiny85, whether you're using Arduino IDE or another platform.
Conclusion:
The "Unpress Alert" system epitomizes the blend of simplicity and functionality, providing users with a versatile tool to bolster their security measures. As you embark on this building journey, remember that the amalgamation of imagination, innovation, and the right components can truly spawn remarkable creations.
Happy tinkering and stay secure!
Code
Sample Code
Arduino
const int piezoPin = 0; // Pin where the piezo is connected
const int buttonPin = 4; // Pin where the push button is connected
bool buttonPreviouslyPressed = false;
unsigned long alarmStartTime = 0;
const unsigned long alarmDuration = 10 * 60 * 1000; // 10 minutes in milliseconds
const unsigned long beepDuration = 500; // Duration of a single beep in milliseconds
bool alarmActive = false;
void setup() {
pinMode(piezoPin, OUTPUT);
pinMode(buttonPin, INPUT_PULLUP); // Using internal pull-up resistor
}
void loop() {
bool buttonPressed = !digitalRead(buttonPin); // Button press reads LOW due to pull-up resistor
// Check for button release event
if (buttonPreviouslyPressed && !buttonPressed) {
alarmActive = true;
alarmStartTime = millis();
}
buttonPreviouslyPressed = buttonPressed;
if (alarmActive) {
if (millis() - alarmStartTime < alarmDuration) {
// Make the alarm sound (beep on and off)
tone(piezoPin, 1000); // 1000Hz frequency
delay(beepDuration);
noTone(piezoPin);
delay(beepDuration);
} else {
alarmActive = false;
noTone(piezoPin);
}
}
}
CAD-Custom parts and enclosures
Part 1
Cajon1.stl
Part 2
Cajon2.stl
Part 3
Cajon3.stl
Aug 28,2023
779 views
Piezo Alert System.
Unpress Alert: A compact ATTiny85-powered security device sounding alarms upon button release.
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Published: Aug 28,2023
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