요약
Build for monitoring, buy for safety.
본문
By
Samir Makwana
Published Apr 4, 2026, 7:00 PM EDT
Samir Makwana is a technology journalist and editor from India since past 18 years and his work appears on MakeUseOf, HowToGeek, GSMArena, BGR, GuidingTech, The Inquisitr, TechInAsia, TechWiser, and others. He has written news, features, and gadget reviews for national technology media publications. His passion is to help people with their technology problems and gadget purchases. For that, he has worked for some of the biggest international technology publications, covering news, explainers, how-to guides, listicles, and product-buying guides.He has worked as an editor and managed teams since 2015. His expertise broadly covers computers, smartphones, game consoles, headphones, smart home products, browsers, and apps. Sign in to your XDA account
When I grabbed the first-generation Amazon Echo Plus for $180, I planned to make it my smart home hub. It handled my first-generation Philips Hue smart bulbs perfectly for a year. Then it just stopped. No automation worked. Routines quit mid-cycle. Online forums suggested looking into the “connectivity issues” and simply pointed to buying the latest model.
That’s when it clicked: these devices aren’t built to last. They’re built with expiration dates. I shelved my smart home plans because they were too expensive and highly dependent on companies that can pull the plug at any time. A few months ago, I took a different approach: stop buying smart home gadgets and start building them.
Related
I replaced Google Home with Home Assistant and a local LLM, and I'm not looking back
I've almost retired Google entirely in my home.
Posts 49 By Adam ConwayRan the numbers and they didn’t lie
Math made the decision easy
I wanted to explore the recurring advice from smart home communities to build my own devices to see if that made sense financially. I ditched a smart home hub and got a used, spec-bumped mini PC for $150. Then I installed Proxmox on it and ran Home Assistant as my smart home platform.
I made a spreadsheet of gadgets I wanted in my smart home. The Ring doorbell is $100, Aqara FP2 for presence detection is $83, six Ring Alarm Contact sensors are $90, and Netatmo smart home weather station is $180. The total cost was $453, excluding the price of a smart home hub.
This time, I wanted devices that talk to each other without any cloud dependency. I picked up a few ESP32 boards and cheap sensors to build my own smart devices. Here’s what I chose:
- Five ESP32 boards for $45
- Two Magnetic reed switches for $1
- mmWave Radar sensor (LD2410) for $5
- PIR motion sensor (HC-SR501) for $4
- Humidity, temperature, and pressure sensor (BME280) for $5
Beyond the sensors, I needed tools to build devices: a soldering iron for $14, Kester (63/37) solder wire for $14, de-soldering wick for $6, and flux for $9. Collectively, all parts cost me around $100.
Shaking off the code and development woes
Community support helps out
At first, I thought buying ESP32 meant I needed to learn actual electrical engineering and write code from scratch. Turns out, the prolific Home Assistant community and ESP32 on Reddit have always offered guidance and code that’s ready to flash after minor tweaks.
Over time, I realized that the ESPHome integration in Home Assistant did all the heavy lifting to compile and flash firmware on ESP32. Later, the community shared ready sketches that I could flash using Arduino IDE. Thanks to all that, I feel confident about working with ESPHome, Arduino IDE, and PlatformIO in Visual Studio. Occasionally, I can use ESP-IDF and Tools on my Mac to run specific ESP32 projects from GitHub.
All those hours spent learning and troubleshooting taught me enough that I am confident to build, compile, and flash custom firmware for ESP32. Some level of working knowledge about the software tools does make things easier.
The stuff I didn’t expect (but I can’t live without it now)
Saving money was just the start
Honestly, cost savings drew me towards building ESP32 devices initially. Over time, I realized how easy it was to dismantle one: remove the jumper cables from an ESP32 and plug another sensor in. Then, I flashed another custom firmware for the new sensor and built another device in less than an hour. What sold me was that every ESP32 device I built worked locally, without a cloud dependency. They even worked without an active internet connection.
My initial builds took over four hours and some of them an entire weekend. That’s on me — I am not a developer, just an enthusiastic tinkerer. Every time I hit a snag, I look to online smart home communities and have always found help within a day. Besides, Home Assistant and ESPHome aren’t sunsetting any of their features or suddenly introducing subscriptions.
My first ESP32 project with a reed switch worked for several weeks before I repurposed the board. Others, like a Bluetooth Proxy, keep running in the background with zero maintenance.
When does buying a smart home gadget make sense?
Safety is paramount
While I’ve built hobbyist-grade smart home devices, they’re nowhere near the level of commercial products where safety is paramount. I’m not building smoke detectors, CO monitors, or anything that requires safety certification from folks who test such stuff. Insurance companies care about those labels.
Subscribe to the newsletter for DIY Smart-Home Blueprints
Subscribing to the newsletter gives step-by-step ESP32 plans, parts lists, community-tested firmware snippets, troubleshooting tips, and safety guidance so you can build local, cloud-free smart-home devices and know when certified gear is required. By subscribing, you agree to receive newsletter and marketing emails, and accept our Terms of Use and Privacy Policy. You can unsubscribe anytime.The ESP32 devices in my smart home are designed to monitor and collect data I can use for automation and adjustments. For example, a DIY water leak sensor may work for water leakage alerts. But insurance companies mandate a certified smart water valve for automatic shutoff.
Related
6 projects you can complete in a weekend with the $5 ESP32
The ESP32 is affordable and powerful, and there's a lot you can do with one.
Posts 3 By Adam ConwayBuilding a smart home that works for me
I continue to build ESP32 devices for better monitoring and automation. I am tired of paying a premium for cloud-dependent smart home gadgets that phone home, only to have the company pull support at any time. However, I shall buy certified products for safety and compliance. Not risking my family's safety just to save money.
That Echo Plus taught me an expensive lesson about planned obsolescence. That's why I built a smart home ecosystem that works on my terms. With an ESP32 board and a couple of cheap sensors, you can make a smart device which costs a fraction of a commercial one.