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

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

#61

Post by swizzler »

guiambros wrote: post #48
Mostlygeek wrote: post #18

I built a little robot that props open a door when the av cabinet gets too hot. It has a temperature sensor, two fans and a linear actuator. It even has a small webui so I can manually enable/disable cooling. Been working for several years.

Ha, that's a great idea. I have a smart exhaust fan in the av closet, but it still lacks air circulation, so opening the door slightly every now and then (particularly when there's high load / heat dissipation) could be a nice extra feature. How did you mount the linear actuator? I need to retain the ability to manually open/close the door. Maybe using a magnetic latch.

Some one else used a stepper motor actuated cam to open a dishwasher, could be used instead of a linear actuator: https://community.home-assistant.io/t/diy-automatic-opener-f...

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

#62

Post by vosper »

swizzler wrote: post #59

I have a very old rotary phone that you “dial” how bright to make the lights. esp8266 detects dial pulses, sends mqtt message to home assistant, home assistant sets zigbee can/recessed lights to requested setting

That sounds really fun to use, I love it

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

#63

Post by swizzler »

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 OP, I use AirGradient recommended Senseair S8

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

#66

Post by dgacmu »

I tend to roll my own with rp-picos for no good reason other than they're easy.

1) Wattmeter for a toy solar installation - broadcasts a UDP packet every few seconds, which I then record into a staging JSON log that gets ingested into DuckDB.

2) Little pico-w wifi temperature sensor that feeds into the raspberry pi zero that controls my boiler.

Thread about the boiler: https://hachyderm.io/deck/@dave_andersen/111579107766689328

github with some really crappy rust code: https://github.com/dave-andersen/boiler

The boiler control is the fun one but it's not entirely embedded stuff. Runs a little control loop that turns down the boiler modulation based upon the difference between target and current temperature. Improves operating efficiency by a fair bit and reduces temperature swings. Makes me wish residential HVAC systems were more sophisticated - these are things any good industrial control system can do.

3) Made an "ok to wake" light for my son -- added a controllable LED strip to his clock with a pico-w in it that changes from orange to multicolored at 6:30am as a non-intrusive "yes, you can come bug your parents" signal.)

https://hachyderm.io/deck/@dave_andersen/112091315519210298

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

#69

Post by mft_ »

I have three strings of ws2812b LEDs on my kitchen controlled by two ESP8266s with PIR sensors, providing various under-cupboard lighting. It sounds over-engineered and was quite a lot of work to set up, but I chose to 'roll my own' because I couldn't find anything pre-made with the right combination of features without being too bulky. (Honestly, I'd happily have bought someone's product instead.)

A nice bonus is that I can program different patterns to suit moods or events. (For example, my partner requested scrolling red and green stripes for Christmas.)

(Tangent: pretty sure that despite having followed online guidance very closely, the power supplies I bought were vastly over-specced.)

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

#70

Post by cocoflunchy »

dgacmu wrote: post #66

I tend to roll my own with rp-picos for no good reason other than they're easy. 1) Wattmeter for a toy solar installation - broadcasts a UDP packet every few seconds, which I then record into a staging JSON log that gets ingested into DuckDB. 2) Little pico-w wifi temperature sensor that feeds into the raspberry pi zero that controls my boiler. Thread about the boiler: https://hachyderm.io/deck/@dave_andersen/1115791…

I also made an "ok to wake" alarm clock for my daughter :) https://cosmith.fr/projects/nightbox
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