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Count-Down Timer.

This document provides instructions for connecting an LCD display, push buttons, and an optional buzzer or LED to an ESP32 microcontroller. It details the specific GPIO pin connections for each component, as well as the necessary power supply requirements. Additional materials needed for the setup include resistors, a breadboard, and jumper wires.

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shadowred191
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15 views4 pages

Count-Down Timer.

This document provides instructions for connecting an LCD display, push buttons, and an optional buzzer or LED to an ESP32 microcontroller. It details the specific GPIO pin connections for each component, as well as the necessary power supply requirements. Additional materials needed for the setup include resistors, a breadboard, and jumper wires.

Uploaded by

shadowred191
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as RTF, PDF, TXT or read online on Scribd
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LCD Display (16x2 or 20x4 with I2C module)

 SDA (Data Line): Connect to ESP32 GPIO21 (default I2C data pin).

 SCL (Clock Line): Connect to ESP32 GPIO22 (default I2C clock pin).

 VCC: Connect to the ESP32's 3.3V or 5V pin (check your specific LCD module
for voltage requirements).

 GND: Connect to the ESP32's GND.

Push Buttons
 Button 1 (Set Time):

 One pin of the button connects to an ESP32 GPIO pin, e.g., GPIO18.

 The other pin connects to GND.

 Use a pull-up resistor if needed (internal pull-up can be enabled in


software).
 Button 2 (Start/Stop):

 One pin of the button connects to another ESP32 GPIO pin, e.g., GPIO19.

 The other pin connects to GND.

 Again, use a pull-up resistor if needed.

 (Optional): Additional buttons for resetting or adjusting time intervals can be


connected similarly to other GPIO pins.

Buzzer or LED (Optional for Alarm)


Positive Lead: Connect to an ESP32 GPIO pin, e.g., GPIO23.

Negative Lead: Connect to GND.

If using a buzzer, you may need a current-limiting resistor.

Power Supply
 Power the ESP32 through the micro USB connection or use a 5V external
 power supply connected to the VIN pin.

 Ensure that the ground (GND) of all components is connected to the ESP32’s
GND to create a common ground.
Materials Needed
o ESP32 Board - The microcontroller for managing the countdown logic.

o LCD Display (16x2 or 20x4) - Preferably one with an I2C module for simpler
wiring.

o Push Buttons (2 or more) - For setting and controlling the timer.

o Resistors (Optional) - Pull-up resistors for stabilizing button inputs (usually


10kΩ).

o Breadboard - For prototyping and making connections.

o Jumper Wires - To connect all the components.

o Buzzer or LED (Optional) - To indicate the end of the countdown.

o Power Supply - Either a USB cable for the ESP32 or a 5V power adapter.

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