I’ve been in the HA world since the time the government placed the world under house arrest. Since then I’ve seen all sorts of amazing things people can do with an esp32 device.
So I’m late to the game. I always thought it may become a dangerous rabbit hole so I’ve just avoided it. But apparently I have 4 coming today so it’s about time to ask you guys what you do.
My first project was gonna be getting some Bluetooth tracking going on around the house to get some room prescence going on.
I also read I can make some seat/bed sensors with a little wire, aluminium foil, paper and a folder-insert, that sounds like it could be fun.
I have a breadboard and a bunch of components I bought when I first got a Pi. I don’t know how compatible these components are with esp32s or what the hell I can do.
I don’t have a soldering iron (yet).
So basically: noob post, gimme some easy projects that don’t require a lot, or wow me with your esp projects.
ESPHome is amazing - there’s so much you can do without writing a single line of code.
I have built a few projects around the platform - a boiler monitor that tells me temperatures and state of zone valves, an energy monitoring system tracking electricity usage and solar export, and a hot tub mod that inhibits the heater to reduce grid import and maximize self consumption of solar. They have all been rock-solid stable.
If you also enjoy 3D printing, there’s a fun project to make an NFC tag reader with ESPHome. I use it for a jukebox where my playlists are NFC chips with the corresponding Spotify URLs. It lets anyone in the house tap a playlist to play. Much easier than having to get your phone out, and it’s reminiscent of flipping through CDs back in the day.
Also bought an ESP and some components but haven’t yet done anything.
Just make sure you have a prototyping board.
I hate soldering, so I will only cross that road once I have a very solid project and idea.
I have two Digi WLED controllers a handful of project kits, myself.
The WLED boards drive some addressable LED strings in my living room and on my patio. They hardly count as “project” kits, but learning about interfacing TTL logic with the LED driver boards was a helpful experience. I learned a lot about the different GPIO uses and modes.
For the project kits I’ve built, I’ve been focused around presence and environment sensors. Using esphome I’ve successfully built PIR (AM312) + mmWave radar module (R60A) presence sensors, natural gas detectors for kitchen and basement utility areas, and a water leak sensor for the laundry area. I had goals of building a 5-in-1 presence sensor, but you can buy products for those now; its a solved problem.
I’ve been considering a design for a sump pit depth gauge because that sounds like useless information that I’d like to have for some reason.
I’ll probably get interested in energy management soon, and will look into current clamps and tracking usage at smart receptacles.
I don’t suppose you can dumb it down 2 notches? What do the kits do? PIR and Radar I don’t get the application for, and I don’t know the meaning of addressable led strings.
I have one esp32 I was starting to configure for room assistant and gave up. This is not your problem, but I feel like the HA world is deep and it’s easy to start in the kiddie pool end, but I can’t even understand the deep end and I don’t know how to keep moving forward with more than just more switches and more random sensors.
Sure. Think of it like Lego bricks or one of those 1000-in-1 electronics kits. These kits don’t do anything specific, they’re building blocks you use to address a need you have in your home automation vision.
The ESP32 kits are just an ESP32 development board (mine are WROOM boards from Freenove) which has the microprocessor, headers breaking out the IO pins, and a “loader” module that facilities uploading code and is used to power the device with a USB cable. The boards also have onboard WiFi and Bluetooth radios. The -CAM variety has a low profile header to seat a small camera module (included). Look for “Freenove ESP32 WROOM” on your preferred online marketplace.
There are several ways to interact with (program) your ESP32 boards. The easiest and most straightforward is to use the ESPHome add-on in HA from the HACS store, along with the companion integration. The ESPHome add-on provides a software ecosystem of drivers and functions for a laundry list of hardware devices you can use in your project-- sensors, switches, lights, speakers, etc. The ESPHome wiki is sort of a catalog of supported peripherals you can easily use in your build projects. Many times, you can substitute components or extend an existing component driver. Mostly you assemble your components and the controller, and then write some YAML do tell ESPHome what devices are plugged into what pins. ESPHome more or less handles the rest.
The ESP32 integration creates HA devices and entities of the devices and sensors in the ESPHome add-on for use as triggers, conditions or actions in automation.
As for my specific doodads:
PIR is a Passive Infrared Receiver. It monitors its field of view for a change in infrared light (heat) which indicates a “hot.blob” has entered or left its field of view. The model I use, AM312, is designed to signal a change in IR light by raising a signal pin to +3 volts, which has applications in presence detection. It is fast, but not accurate. It also tends to “go blind” when the hot blob stops moving, and can be subject to false positives when the HVAC kicks on or by dappled sunlight
The mmWave radar is a Seeed R60A 60Ghz radar module. This particular module is optimized for human presence detection and fall detection. It uses millimeter wave radar to acquire and track humans in its field of view. 60GHz gives enough resolution to detect heartbeat, respiration and micromkvements like fidgeting. It talks to the ESP32 over the I2C bus (a digital IO bus similar to USB). It has advantages over the PIR sensor because it actively tracks its targets and can even tell if there are multiple people. Its less prone to false positives from environmental changes and smaller animals. Unfortunately, it can take several seconds to acquire a target and begin tracking it. In a presence application, a human could walk across several steps into the field of view within that time, giving the impression of a slow response.
Using both sensors in a presence application is a sort of belt-and-suspenders approach. You can compare the state of both sensors in your automations to determine presence with greater accuracy.
As for learning HA itself: we all started in a similar place not even knowing what we didn’t know yet. You sort of poke and play and build some bad automations. Then you start to research new projects and start to learn what you don’t know yet. That’s OK: its a roadmap to future knowledge.
In my rig, I use HA to solve problems or address nuisance situations around the house. Wife and kids are forever leaving doors open with the HVAC on. I programmed HA to watch the HVAC (ecobee thermostat) and the states of the windows doors. If a door gets left open for more than 10 minutes, HA starts flashing lights as an indicator for someone to check notifications. After 20 minutes of the door/window being open, it turns off the HVAC and sends a push notification to my phone that someone is being a dumbass.
Another one is to shut off the basement lights at 10pm because the kids never remember to after they’re done gaming down there.
Eventually you want to do.more sophisticated things, and that when the rabbit hole gets real deep.
Are you familiar with WLED and ESPHome? You generally have two sets of pin outs, analog [pwm] and digital. You can hook almost anything up if you program your pin-outs to respond correctly. If you’re trying to get into programming on the ESP32, start with some Arduino programs. They both use the same C libraries.
