4 ESP32 projects that solve real smart home problems


The ESP32 has become a killer gadget for anyone who wants to DIY their own smart home solutions. Why wait for someone to make the smart home gadget of your dreams when you can combine an ESP32 with a few accessories and program it to do exactly what you need?

Not only can this be cheaper than a bespoke device, there’s a good chance someone out there has already done what you want, so you don’t have to start from scratch.

A smart energy monitor that actually cuts your power bill

Everyone’s feeling the pinch

Wouldn’t you know it, the world’s short on energy again. Whether you’re trying to be more green or just save a buck because electricity has become more expensive again, an energy sensor is crucial to knowing how much power you’re using, and whether something is using more than it should. Preferably long before you receive the actual bill!

There are a few different approaches to building an energy monitor, but most of them involve installing clamps on your mains power cables, and using a power monitoring device that can interface with your ESP32. This setup by Volos Projects looks like a particularly slick example.

A local-only smart home controller (no cloud dependency)

This is what a real smart home is

I’ve written before that a real smart home is one that keeps working when the internet goes down. Most smart home solutions people use rely on some distant cloud service to work. There’s barely any “brain” in the local device.

Well, you don’t have to accept that. Home Assistant has become an incredibly popular solution for those who don’t want to become reliant on others for smart home functionality. You can self-host Home Assistant, and get numerous plugins for it.

One of these is ESPHome, which is firmware you can flash to your ESP32 (and a few other) boards to turn them into smart home devices. With the ESPHome plugin set up in Home Assistant, you can control your ESP32s like any smart home device. This guide by Learn Fast Make Things show you exactly how the basic setup works.

Of course, that ESP32 needs to be connected to additional hardware to be useful, like temperature sensors or lights. If you’re looking for a quick start, ESPHome has a list of ready-made projects that you can use to get started.

Smart plant watering systems that prevents dead plants

Wetter is better, except when it’s too wet, I guess

My wife loves houseplants, and she’s constantly walking around with a hygrometer checking whether her plants need water. I looked at smart plant monitoring systems, but wow are they expensive. Well it turns out one possible solution is using an ESP32 with the right sensors and you can set up a system that will tell you if your plants need the wet stuff.

Maker Giovanni built the watering portion of the system as you can see here, but that doesn’t have the moisture sensing part.

SriTu hobby put out this video which has both a moisture sensor and the water part of the equation. Which should give you enough of an idea to craft your own custom solution.

Garage parking assistant (perfect parking every time)

Liiike a glove!

I have a very tight parking situation in the house I’m currently renting, and my SUV only barely fits in with enough space for me to get out and close the garage door. This is actually a pretty common problem, and I’ve seen people use solutions like a tennis ball on a piece of string that lets them know the car is in far enough. Personally, I made a mark on the wall that I could see through the driver’s side window, which tells me when I’ve reached the right spot.

But, maybe it’s time to come out of the stone age and craft a better parking solution. There are several ESP32 projects you can find online to create a parking assistant. This usually needs at least an ESP32 and an ultrasonic sensor, but you can go much further.

This project by Crazy Couple DIY has a custom PCB, 3D-printed parts, and an LED ring that shows exactly how far you are from the rear wall of the garage.


You can also use data from these parking assistants to know whether a car is parked in the garage or not. Useful if you have multiple vehicles and want to see who is home!

MakerHawk Heltec V3 LoRa board with battery.

Brand

MakerHawk

Operating System

Meshtastic

This ESP32 kit includes everything you need for connecting to your local Meshtastic network, or any other LoRa-based tech project. There’s an LED display, a 1100mAH battery, and multiple antennas.




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Recent Reviews


Google Maps has a long list of hidden (and sometimes, just underrated) features that help you navigate seamlessly. But I was not a big fan of using Google Maps for walking: that is, until I started using the right set of features that helped me navigate better.

Add layers to your map

See more information on the screen

Layers are an incredibly useful yet underrated feature that can be utilized for all modes of transport. These help add more details to your map beyond the default view, so you can plan your journey better.

To use layers, open your Google Maps app (Android, iPhone). Tap the layer icon on the upper right side (under your profile picture and nearby attractions options). You can switch your map type from default to satellite or terrain, and overlay your map with details, such as traffic, transit, biking, street view (perfect for walking), and 3D (Android)/raised buildings (iPhone) (for buildings). To turn off map details, go back to Layers and tap again on the details you want to disable.

In particular, adding a street view and 3D/raised buildings layer can help you gauge the terrain and get more information about the landscape, so you can avoid tricky paths and discover shortcuts.

Set up Live View

Just hold up your phone

A feature that can help you set out on walks with good navigation is Google Maps’ Live View. This lets you use augmented reality (AR) technology to see real-time navigation: beyond the directions you see on your map, you are able to see directions in your live view through your camera, overlaying instructions with your real view. This feature is very useful for travel and new areas, since it gives you navigational insights for walking that go beyond a 2D map.

To use Live View, search for a location on Google Maps, then tap “Directions.” Once the route appears, tap “Walk,” then tap “Live View” in the navigation options. You will be prompted to point your camera at things like buildings, stores, and signs around you, so Google Maps can analyze your surroundings and give you accurate directions.

Download maps offline

Google Maps without an internet connection

Whether you’re on a hiking trip in a low-connectivity area or want offline maps for your favorite walking destinations, having specific map routes downloaded can be a great help. Google Maps lets you download maps to your device while you’re connected to Wi-Fi or mobile data, and use them when your device is offline.

For Android, open Google Maps and search for a specific place or location. In the placesheet, swipe right, then tap More > Download offline map > Download. For iPhone, search for a location on Google Maps, then, at the bottom of your screen, tap the name or address of the place. Tap More > Download offline map > Download.

After you download an area, use Google Maps as you normally would. If you go offline, your offline maps will guide you to your destination as long as the entire route is within the offline map.

Enable Detailed Voice Guidance

Get better instructions

Voice guidance is a basic yet powerful navigation tool that can come in handy during walks in unfamiliar locations and can be used to ensure your journey is on the right path. To ensure guidance audio is enabled, go to your Google Maps profile (upper right corner), then tap Settings > Navigation > Sound and Voice. Here, tap “Unmute” on “Guidance Audio.”

Apart from this, you can also use Google Assistant to help you along your journey, asking questions about your destination, nearby sights, detours, additional stops, etc. To use this feature on iPhone, map a walking route to a destination, then tap the mic icon in the upper-right corner. For Android, you can also say “Hey Google” after mapping your destination to activate the assistant.

Voice guidance is handy for both new and old places, like when you’re running errands and need to navigate hands-free.

Add multiple stops

Keep your trip going

If you walk regularly to run errands, Google Maps has a simple yet effective feature that can help you plan your route in a better way. With Maps’ multiple stop feature, you can add several stops between your current and final destination to minimize any wasted time and unnecessary detours.

To add multiple stops on Google Maps, search for a destination, then tap “Directions.” Select the walking option, then click the three dots on top (next to “Your Location”), and tap “Edit Stops.” You can now add a stop by searching for it and tapping “Add Stop,” and swap the stops at your convenience. Repeat this process by tapping “Add Stops” until your route is complete, then tap “Start” to begin your journey.

You can add up to ten stops in a single route on both mobile and desktop, and use the journey for multiple modes (walking, driving, and cycling) except public transport and flights. I find this Google Maps feature to be an essential tool for travel to walkable cities, especially when I’m planning a route I am unfamiliar with.


More to discover

A new feature to keep an eye out for, especially if you use Google Maps for walking and cycling, is Google’s Gemini boost, which will allow you to navigate hands-free and get real-time information about your journey. This feature has been rolling out for both Android and iOS users.



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