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nodemcu-based-3d-printed-indoor-gauge-thermometer-617d69-en.md

Had some time this weekend and a desire to create something new and interesting, so went ahead and created an Arduino/NodeMCU based indoor dial thermometer. This device displays the temperature in degree centigrade on a D-Shaped Gauge as well as on a 7-Segment display.

In addition to that, it also saves the temperature and humidity readings in a MySQL DataBase hosted on a home based Raspberry Pi Server. The data is then displayed using the "Our Smart Home" app.

Project Design and Aesthetics

This project combines high-precision sensing with retro-style analog aesthetics. The Indoor Dial Thermometer features a 3D-printed D-shaped gauge housing that uses a physical pointer to indicate temperature, alongside a precise digital readout on a TM1637 7-Segment Display.

Core Technologies

  • Sensing: The DHT22 (AM2302) sensor provides highly accurate temperature and humidity readings. Unlike the cheaper DHT11, the DHT22 offers a wide measurement range and higher resolution.
  • Mechanical Output: A small 28BYJ-48 Stepper Motor (with a ULN2003 driver) is used to position the analog dial's needle. Stepper motors are ideal here because they allow for precise, repeatable movements across the gauge range.
  • WiFi Connectivity: The ESP8266 (NodeMCU) connects to the local network to transmit environmental data to a central database.

Data Logging Infrastructure

Beyond the physical display, the system functions as an IoT node.

  1. The Server: A Raspberry Pi running a LAMP stack (Linux, Apache, MySQL, PHP) acts as the local home automation hub.
  2. The Database: The NodeMCU sends HTTP POST requests containing JSON data to a PHP script, which then inserts the values into a MySQL table.
  3. The App: Data can be viewed remotely through a custom "Our Smart Home" application, which visualizes historical trends of temperature and humidity.

Assembly and Printing

The gauge face and housing are 3D printed to provide a professional finish. The internal components are mounted on a custom PCB or secured within the 3D-printed chassis. Calibration of the stepper motor is required in the setup() function to ensure the needle points correctly at 0°C on power-up.

Development Resources

ข้อมูล Frontmatter ดั้งเดิม 

title: "NodeMCU Based: 3D Printed Indoor Gauge Thermometer"
description: "Created an Arduino/NodeMCU based indoor dial thermometer"
author: "tarantula3"
category: "Sensors & Environment"
tags:
  - "Home Automation"
  - "Weather"
  - "Smart appliances"
  - "Monitoring"
  - "Arduino User Group"
views: 670
likes: 0
price: 1499
difficulty: "Easy"
components:
  - "1x NodeMCU ESP8266"
  - "1x DHT22 Temperature and Humidity sensor"
  - "1x TM1637 Display"
  - "1x 3D Printer"
  - "1x 10k Resistor"
  - "1x Stepper motor 28byj-48"
tools: []
apps:
  - "1x Arduino IDE 2.0 (beta)"
downloadableFiles:
  - "https://github.com/tarantula3/Indoor-Dial-Thermometer"
documentationLinks: []
passwordHash: "7436d48ea5f416866ca15d1db560e6b0aafa764b4654a38ce27d66d949e61fcc"
encryptedPayload: "U2FsdGVkX19AHEE4zq3wfImPpY4eseDFlVeacdkwe2hteGCw6gZiYxhupnP82sUXPsCxU/eN6id+NVX3870/9xi6vkIReEEOiPn4l+QpfMk="
seoDescription: "Build an Arduino and NodeMCU based Indoor Dial Thermometer with 3D Printed parts for accurate temperature tracking."
videoLinks:
  - "https://youtu.be/vO6adrETQIA"
heroImage: "https://cdn.jsdelivr.net/gh/bigboxthailand/arduino-assets@main/images/projects/nodemcu-based-3d-printed-indoor-gauge-thermometer-617d69_cover.png"
lang: "en"