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IoTIntermediateAges 18+An afternoon

DIY Smart Inventory Button for Stock Replenishment

Published June 10, 2026

This project offers a practical solution for quickly reordering frequently used items, ideal for a hobby workshop or a small business managing consumables. It enables users to instantly trigger a stock replenishment notification with a simple button press, streamlining inventory management and preventing stockouts. Imagine a small clinic instantly reordering sterilization wipes or a local artisan shop re-ordering specific craft supplies.

What you'll need

  • ESP32 development board x 1
  • Momentary push-button switch x 1
  • Resistor (10k ohm) x 1
  • Breadboard x 1
  • Jumper wires (male-to-male) x 5
  • Micro USB cable (for ESP32 programming/power) x 1

Step-by-step

  1. 01

    Prepare the ESP32 Development Environment

    1. Install the Arduino IDE from the official website. 2. Open the Arduino IDE, go to 'File' > 'Preferences', and add 'https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json' to 'Additional Board Manager URLs'. 3. Go to 'Tools' > 'Board' > 'Boards Manager', search for 'ESP32' and install the 'esp32 by Espressif Systems' package.

  2. 02

    Wire the Push-Button to ESP32

    1. Connect one leg of the push-button to the ESP32's 3.3V pin. 2. Connect the other leg of the push-button to ESP32's GPIO pin 27. 3. Connect one end of the 10k ohm resistor to ESP32's GPIO pin 27. 4. Connect the other end of the 10k ohm resistor to ESP32's GND pin.

  3. 03

    Develop the ESP32 Firmware

    1. Open a new sketch in Arduino IDE. 2. Include WiFi and HTTPClient libraries. 3. Define your WiFi credentials (SSID and password) and a webhook URL for your notification service (e.g., IFTTT, Zapier, or a custom endpoint). 4. In the `setup()` function, initialize Serial communication, connect to WiFi, and configure GPIO pin 27 as an input with a pull-down resistor. 5. In the `loop()` function, read the state of GPIO pin 27. If the button is pressed, send an HTTP POST request to your webhook URL with a simple payload (e.g., 'item_id': 'craft_supplies_A'). Include a debounce delay.

  4. 04

    Set Up a Webhook for Notifications

    1. Choose a notification service that supports webhooks (e.g., IFTTT, Zapier, or a basic server-side script). 2. Create a new 'HTTP webhook' trigger that listens for POST requests. 3. Configure an action based on this trigger, such as sending an email, a push notification to your phone, or updating a spreadsheet/database. Ensure the webhook URL provided in your ESP32 code is correct and accessible.

  5. 05

    Test and Deploy

    1. Upload the code to your ESP32 board via the Micro USB cable. 2. Open the Serial Monitor in Arduino IDE to observe connection status and debug messages. 3. Press the physical button and verify that your configured notification (email, push, etc.) is received. 4. Once thoroughly tested, integrate the button and ESP32 into a small enclosure for practical use.

Tips

  • Consider adding a small LED indicator to confirm button press and Wi-Fi connection status.
  • For enhanced security, use HTTPS for your webhook and consider API key authentication if your notification service supports it.
  • The webhook payload can be expanded to include item quantity, user ID, or priority levels for more sophisticated inventory management.
#iot#inventory-management#esp32#webhook#diy
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