iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
ESP32 projects can help you monitor electricity, water, and room conditions, but none guarantees a lower bill. A build pays for itself only if the money you actually avoid spending exceeds its hardware, installation, and maintenance costs over a period you choose. These five beginner-accessible ideas offer practical value; for the utility monitors, savings depend on what you change after seeing the data.
How to tell whether an ESP32 project pays for itself
Start with a specific cost the project might replace or reduce. A room sensor could replace a separate display you planned to buy; an appliance monitor might reveal a device worth switching off or replacing. Compare that potential value with the complete added cost: board, sensor, enclosure, power supply, tools, installation, any Home Assistant host you do not already own, and upkeep.
- Record a baseline for the resource or expense you want to affect, such as an appliance’s energy use or your water consumption.
- Install the monitor and collect readings over a suitable period. Match the measurement to the question: instantaneous power is measured in W or kW, while accumulated energy is measured in kWh.
- Make a defined change, such as reducing an appliance’s run time, then measure again under comparable conditions.
- Use your local utility rate and the observed difference to estimate avoided spending. Subtract the project’s total added cost over the same period.
A dashboard or sensor reading is evidence of use, not evidence of savings by itself. The official Home Assistant documentation says its Energy dashboard can combine compatible electricity, gas, and water sources, including monitors, smart plugs, inverters, and utility meters: Home Assistant Energy dashboard.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsFive ESP32 projects to consider
1. Room environment sensor
Build a temperature, humidity, and air-pressure sensor with a BME280 and an ESP32. ESPHome’s beginner recipe makes this a contained way to learn about sensors and Home Assistant. Its most direct financial case is replacing a separate display or sensor you otherwise intended to purchase; the recipe does not establish that the build itself reduces household bills. See the ESPHome getting-started guide.
#1 Best Overall
- Powerful ESP-32 Board: Unlock the world of Internet of Things (IoT) and advanced electronics with the heart of this kit: the ESP-32 board. It features a powerful dual-core processor, integrated Wi-Fi and Bluetooth 4.2, making it perfect for building connected, smart devices that communicate with your phone or the cloud. It's fully compatible with the Arduino IDE for easy programming.
- Super Starter Kit: This kit contains over 35 different modules and electronic components, including sensors, displays, motors, and input devices. From LEDs and buttons to an OLED screen, servo motor, and keypad, you have everything needed to explore a vast range of projects in one box.
- Step by Step Online Tutorial: Jump right in with our detailed, beginner-friendly tutorial. Access 30+ projects with complete code, clear circuit diagrams, and step-by-step instructions. Learn the fundamentals of electronics, coding, and how to utilize the ESP-32's unique capabilities without any prior experience.
- Hands-on Learning for All Skill Levels: Perfect for students, makers, engineers, and hobbyists. Start with basic circuits and coding, then progress to intermediate and advanced IoT applications. Build practical projects like weather stations, smart home controllers, remote-controlled devices, and interactive gadgets. The skills you learn are the foundation for real-world innovation.
- Quality & Great Support: Elegoo is committed to quality. We provide a clear, detailed tutorial guide, refined code, and a well-organized component kit. All modules are carefully selected for reliability and ease of use. Our dedicated technical support team and active online community are ready to help you succeed in your learning journey.
- Measures: temperature, humidity, and air pressure.
- What could pay back: a display or sensor purchase you no longer need.
- What to verify: that the sensor module and board are supported by your chosen ESPHome configuration.
2. Doorbell notification device
ESPHome’s project gallery describes a build that turns an ordinary doorbell into a smart notification system, using “just a couple of dollars in parts.” Treat that as the project page’s description, not a current bill of materials or a price that applies to every installation. It may be worthwhile if it replaces a standalone notifier you would otherwise buy. Check the project details and your existing doorbell setup before wiring anything: ESPHome projects.
- Measures or detects: a doorbell event and sends a notification.
- What could pay back: avoiding a separate notification device, if that device would meet the same need.
- What to verify: the doorbell’s electrical setup and the project’s requirements; do not assume every doorbell is compatible.
3. Electricity meter pulse reader
Some electricity meters have an activity LED that flashes in proportion to energy use. An ESP32-based reader can count or time those flashes; Home Assistant points to Home Assistant Glow, an open-source ESPHome solution. This can make whole-home consumption patterns visible, but a reading only supports savings if it leads to a change that reduces consumption. Meter features and installation details vary, so first confirm that your meter has a suitable pulse LED. See Home Assistant’s electricity grid guidance.
Rank #2
- ESP32 camera board: Dual-core 32-bit microprocessor up to 240 MHz, 4 MB flash, 8 MB PSRAM, onboard 2.4 GHz Wi-Fi and Bluetooth 4.2 (LE), USB code uploader, camera, memory card slot (Comes with 1GB memory card and card reader)
- 3 sets of code: MicroPython, C and Processing (Java). Python is one of the most popular languages, and C is one of the most classic languages. Processing code needs to run on computers to provide graphical interfaces
- Detailed tutorial: Can be downloaded (in English, 795-page in total) or viewed online (original in English, can be translated into other languages by browsers) (The tutorial link can be found on the product box, no paper tutorial)
- 122 projects from simple to complex: Provides step-by-step guide with electronics and components knowledge, each project has schematics, wiring diagrams, complete code and detailed explanations
- 240 items in total: This ultimate kit includes the most commonly used electronic components, modules, sensors, wires and other compatible items
- Measures: whole-home electricity use inferred from meter LED pulses.
- What could pay back: a behavior or automation change that measurably lowers use.
- What to verify: pulse-LED availability, safe mounting, and compatibility with the chosen reader.
4. Water-meter reader
A water-meter project is highly dependent on the meter itself. Possible approaches include sensing a rotating disk, detecting magnetic pulses or proximity, or using an ESP32-CAM to read a display. Home Assistant lists an ESP32-CAM display-reading project and notes that DIY setup can be tedious. Identify your meter’s model and interface before buying parts; methods that work for one meter may not work for another. See Home Assistant’s water usage guidance.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →- Measures: water use, using a sensor method that fits the meter.
- What could pay back: finding and correcting usage you would otherwise miss, if the change is reflected in your measured consumption.
- What to verify: whether the meter has a usable disk, magnet, pulse output, or readable display, and whether the proposed method is supported.
5. Appliance energy monitor
To measure one appliance rather than the whole home, Home Assistant supports energy tracking for compatible devices. A smart plug sits between an appliance and its outlet and may communicate over Zigbee, Z-Wave, or Wi-Fi; a smart relay is another option. A custom ESP32 sensor path may suit a maker, while a ready-made plug may be simpler. Compare total cost and setup effort rather than assuming a DIY build is automatically cheaper. See Home Assistant’s individual-device energy guidance.
Rank #3
- Perfect choice for beginners to learn, electronics and program.
- The Basic Starter Kit is easy to use and you can learn to program at an introductory level.
- You can use ESP32 modules to control other modules, such as LED,DHT11,OLED module, etc
- The tutorial include codes and lessons.It will teach every users how to assembly Basic Starter Kit for ESP32.
- Please download our tutorial and learn after you receive the goods.
- Measures: energy use for a compatible individual device.
- What could pay back: an observed change in consumption or avoiding a separate monitor you would have bought.
- What to verify: device and integration compatibility; a smart relay may require a different installation context from a plug-in monitor.
Choose a monitoring method that fits your setup
Home Assistant can combine supported sources in its Energy dashboard, but the right input depends on what you want to measure and what your meter or devices expose. Electricity options include utility-provided data, meter LED pulse counting, infrared reading over IEC62056-21, SML in some regions, and CT-clamp measurement. Availability and compatibility are not universal: utility Zigbee Energy Profile access requires certified hardware and often utility provisioning, while AMR/ERT wireless support varies by meter and region, and some meters are encrypted. CT clamps measure current at a conductor; follow safe installation guidance and use qualified help when the work is beyond your competence.
| Approach | Scope | Main fit check |
|---|---|---|
| Smart plug or supported device integration | One appliance | Device and Home Assistant integration compatibility |
| Meter LED pulse reader | Whole-home electricity | Meter has a suitable activity LED |
| Infrared or protocol reader | Meter data, where supported | Meter port, protocol, and regional availability |
| Water-meter sensor or camera | Water use | Meter interface and sensor method match |
| CT clamp | Electrical current at a conductor | Safe installation and suitable electrical setup |
Set up ESPHome or Arduino-ESP32
ESPHome offers a visual Device Builder or YAML configuration, followed by building and installing the device through a browser or over the air, then connecting it to Home Assistant locally. Its documentation says devices can appear on the local network without cloud accounts or external servers. Follow the current instructions for your chosen board and components because configurations and supported parts can change. Start at the ESPHome documentation.
Rank #4
- COMPREHENSIVE STARTER KIT: Includes an ESP32 development board and over 20 different types of electronic components and modules. This complete set provides everything you need to start learning electronics and building Internet of Things (IoT) projects, all organized in a convenient plastic storage case.
- POWERFUL ESP32 MICROCONTROLLER: Features a versatile ESP32 development board with an integrated dual-core CPU, Wi-Fi, and Bluetooth connectivity. This board serves as the core of your projects, enabling wireless communication and control for a wide range of applications from home automation to robotics.
- DIVERSE SENSORS AND MODULES: Explore your environment with a variety of included sensors. The kit contains a DHT11 temperature and humidity sensor, HC-SR501 PIR motion sensor, an IR infrared obstacle avoidance sensor, and a photoresistor light detection module for creating responsive, intelligent devices.
- INPUTS, OUTPUTS, AND CONTROL: Features an I2C OLED display for showing data, a 2-channel 5V relay module for controlling high-power devices (rated 10A 250VAC / 15A 125VAC), active and passive buzzers for audio feedback, various color LEDs, push buttons, and a potentiometer for precise analog input.
- PROTOTYPING ESSENTIALS INCLUDED: Get building right away with an 830-tie-point solderless breadboard, a bundle of male-to-male jumper wires, a USB cable for power and programming the ESP32 board, and a variety of common resistors. The kit is perfect for both beginners and experienced makers.
- Choose a supported ESP32 board and the sensor or interface for the project.
- Configure the device in ESPHome’s visual Device Builder or in YAML.
- Build and install the firmware through the documented browser or OTA path.
- Connect the device to Home Assistant on your local network and confirm that its readings are sensible before relying on them.
If you prefer Arduino, Espressif’s Arduino-ESP32 documentation recommends installation through the Arduino IDE Boards Manager. The current documentation identifies Arduino-ESP32 core 3.3.12, based on ESP-IDF 5.5, and lists supported chip families; verify support for the exact board or newer chip variant before purchase. See Espressif’s Arduino-ESP32 getting-started guide.
Choose beginner hardware without buying parts you do not need
Espressif recommends choosing a board to match the project requirements. For a first build, embedded USB-to-serial can simplify programming and logs, and breadboard compatibility helps with prototyping. Check these details alongside the selected sensor’s voltage and pin requirements. Espressif’s board guidance is at ESP32 development kits.
Best Value
- ESP32-S3 camera board: Dual-core 32-bit microprocessor up to 240 MHz, 8 MB flash, 8 MB PSRAM, onboard 2.4 GHz Wi-Fi and Bluetooth 5 (LE), USB-OTG, USB code uploader, camera, memory card slot (Comes with 1GB memory card and card reader)
- 3 sets of code: MicroPython, C and Processing (Java). Python is one of the most popular languages, and C is one of the most classic languages. Processing code needs to run on computers to provide graphical interfaces
- Detailed tutorial: Can be downloaded (in English, 828-page in total) or viewed online (original in English, can be translated into other languages by browsers) (The tutorial link can be found on the product box, no paper tutorial)
- 121 projects from simple to complex: Provides step-by-step guide with electronics and components knowledge, each project has schematics, wiring diagrams, complete code and detailed explanations
- 243 items in total: This ultimate kit includes the most commonly used electronic components, modules, sensors, wires and other compatible items
ESPHome recommends its Starter Kit for newcomers. The official page lists an ESP-32 board, ribbon cables, and a snap-apart panel with motion, temperature/humidity, notification, and button modules, as well as a Learning Wiki and visual Device Builder. Price, shipping territory, current stock, and partner status should be checked directly on the ESPHome getting-started page. A kit can be convenient for exploring multiple builds, but a single project may need fewer parts.
- For the room sensor, select a supported BME280 module.
- For a meter project, identify the meter interface first; only then choose a pulse, infrared, water-meter, or camera-based component.
- For appliance energy, compare a compatible smart plug with a custom sensor route on total cost, installation, and complexity.
- Include the enclosure, power, tools, and any host computer you do not already have when estimating the project’s cost.
When these projects are most likely to be worthwhile
The best first project depends on what you need to learn or replace. A room sensor is a relatively contained way to explore sensors; an appliance monitor gives a narrower energy reading; and a whole-home meter reader may help you investigate broader consumption. Water-meter builds are especially dependent on the physical meter and can require more setup. Choose the project whose measurement can inform a concrete decision, then assess payback using your actual local prices and observed results rather than a promised savings figure.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
