DBCLAPP

DBC

IoT Temperature Monitor with ESP32

Category: Tech | Date: September 2025

← Back to Tech Projects

Project Overview (Video)

Step-by-Step Guide

  1. Phase 1: Hardware Setup

    Wire the DHT22 temperature sensor to the ESP32. Ensure proper pull-up resistor is used on the data line.

  2. Phase 2: Firmware Development

    Write Arduino C++ code to connect to Wi-Fi and read sensor data. The firmware is optimized for deep sleep to conserve battery life.

    // Code snippet placeholder for example
#include <WiFi.h>
// ... more code
void setup() { 
  // initialize 
}

  3. Phase 3: Backend Integration

    Set up a simple Python Flask API endpoint to receive POST requests containing the temperature data and store it in a time-series database.

Technical Deep Dive

The core challenge of this project was optimizing power consumption while maintaining data logging reliability. We achieved an average current draw of less than $10 \mu A$ during the deep sleep cycle. The system utilizes a simple HTTP POST request over HTTPS to securely transmit data every 15 minutes.

The API is rate-limited and includes basic sanity checks on the incoming data payload to prevent logging errors.

Component List:

  • Microcontroller: **ESP32 Dev Kit C**
  • Sensor: **DHT22 (Temperature/Humidity)**
  • Power Source: **3.7V LiPo Battery**
  • Backend: **Python/Flask on a VPS**