Ask HN: What have you built with ESPHome, ESP8266 or similar hardware • Hacker News Board

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#21

Post by sho_hn » Sat, Apr 27, 2024, 4:42 PM UTC

fullspectrumdev wrote: post #15

euph0ria wrote: post #4

I built a CO2 sensor that activates a fan in my office room to pull in fresh air if the CO2 levels go above 700ppm

I like this idea, any recommendations on specific CO2 sensor modules?

Not the OP, but I really like the SCD30 by Sensirion. It's the sensor used in the widely popular Aranet4, but the combo of sensor+MCU when you DIY it costs about a third of the commercially integrated product, so the feeling of thrifty hacker accomplishment is a nice bonus on top of the good HW.

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#22

Post by isoprophlex » Sat, Apr 27, 2024, 4:43 PM UTC

Does a raspberry zero count? I replaced the dubiously secure Chinese box that came with my solar panels with a home grown energy monitoring solution, hooked up to HomeAssistant. And I made a full color eInk photo frame that displays seasonally appropriate, generated images from a stable diffusion like-algo.

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#23

Post by mat_jack1 » Sat, Apr 27, 2024, 4:43 PM UTC

I'm helping our local Fablab to manage physical access with a series of ESP8266 and esp-rfid https://github.com/esprfid/esp-rfid/ (of which I became maintainer. If you want to use it as well I can help!)

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#24

Post by gumby271 » Sat, Apr 27, 2024, 4:44 PM UTC

I put together an esp32 + accelerometer in a little 3d printed box. Made two sets and taped one of each on my washer and dryer, now they detect the start and end of a cycle and send me a notification through home assistant. The tablet in the kitchen get a notification too and makes a special sound when the clothes are done!

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#25

Post by moepstar » Sat, Apr 27, 2024, 4:46 PM UTC

bloopernova wrote: post #7

I want to build a house-positioning system, but time, energy, and skill are lacking. My wife, who has pretty extreme ADD, loses stuff like her wallet, keys, etc. We have Tiles on most stuff that gets lost, but sometimes the volume of the alert is lacking. I'd like something that uses multiple ESP32 or Pi receivers in known locations to triangulate the position of the bluetooth beacon in 3D space. It's probably a bad…

I think you might want to look into https://espresense.com/

Basically, this will net you "room precision" location of people, but i can't see why it won't work for gadgets if they have a Tile on them.

Not quite "in 3D space", but may be useful enough...

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#26

Post by seba_dos1 » Sat, Apr 27, 2024, 4:46 PM UTC

A set of cheap temperature sensors out of D1 minis that report data over MQTT. Just a simple piece of code, not using any fancy stuff like ESPHome or Tasmota as there was no need for it. In the end they are supposed to guide the gas boiler heating over OpenTherm, but haven't done that part yet.

I've also made an e-ink calendar with bin collection schedule with Inkplate (ESP32) [0] and now I'm making a Frets on Fire-compatible rhythm game based on ESP32-S3 [1] (initially made for the CCCamp's flow3r badge, now designing a simplified board for it [2][3])

[0] https://social.librem.one/@dos/106014037294005493

[1] https://social.librem.one/@dos/111478238181935805

[2] https://social.librem.one/@dos/112008114803722974

[3] https://social.librem.one/@dos/112179746918615110

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#27

Post by sp0d3rmun » Sat, Apr 27, 2024, 4:47 PM UTC

sho_hn wrote: post #2

My GPT-powered e-Ink newspaper uses an esp32: https://imgur.com/a/NoTr8XX

This looks amazing! Do you have a guide? Would love to recreate this!

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#28

Post by KaiserPro » Sat, Apr 27, 2024, 4:47 PM UTC

The controller for this: https://www.secretbatcave.co.uk/projects/stock-ticker-machin... is an esp of somesort (I think 8266)

I used ESPhome last month to measure how warm/cold the fish pond was (it was cold). That was a simple breadboard/Dallas one wire thing: https://esphome.io/components/sensor/dallas.html

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#29

Post by stephankoelle » Sat, Apr 27, 2024, 4:48 PM UTC

Last year I built a balcony watering system using an 8x ESP32 relay system from Lilygo, paired with mini submersible pumps. To monitor plant health, I integrated MiFlora sensors over BLE. Managing minimum soil moisture and pump duration has been 'configured' by hosting a configuration files on Pastebin.

This year, I'm taking it a step further by developing a management front-end. Instead of the hacker GUI using Pastebin, I'm implementing an extra M5 Atom running MicroPython with a web GUI. This interface allows me to configure the sensors, visualize sensor data with charts, and send notifications via NTFY to my phone.

I am considering open-sourcing the project.

https://www.lilygo.cc/products/t-relay-5v-8-channel-relay

https://de.aliexpress.com/item/1005006100423471.html.

https://shop.m5stack.com/products/atoms3-lite-esp32s3-dev-ki...

Re: Ask HN: What have you built with ESPHome, ESP8266 or similar hardware

#30

Post by bloopernova » Sat, Apr 27, 2024, 4:49 PM UTC

fullspectrumdev wrote: post #15

euph0ria wrote: post #4

I built a CO2 sensor that activates a fan in my office room to pull in fresh air if the CO2 levels go above 700ppm

I like this idea, any recommendations on specific CO2 sensor modules?

You want an NDIR type CO2 sensor. "Nondispersive Infrared Sensor".

Adafruit has lots of really nicely made sensors and MCUs: https://www.adafruit.com/product/4867