92 lines
3.6 KiB
Markdown
92 lines
3.6 KiB
Markdown
---
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title: "Big shiny arcade buttons"
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date: 2019-11-05T08:20:43+01:00
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draft: false
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summary: Adding buttons to my "smart desk" ...
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images: [/static/img/buttons-anim.gif, /static/img/buttons-aus.jpg, /static/img/buttons-switches-marked.jpg]
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---
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Last [post]({{< ref "/posts/desk-automation.md" >}}) i teased the next upgrade of my smart desk project which are some big arcade buttons to control the light even when my network is down. Well...
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I finished that part over the last few days:
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{{< figure src="/img/buttons-aus.jpg">}}
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The buttons i did choose for the desk are thous big arcade buttons[^1] as they produce this satisfying click when pressed. They come with an integrated LED and resistor, but -as they are not supposed to be driven by a 3.3 volt microcontroller- they need 12 volt supplied to be fully lit up. For the controller i use a normal USB power supply so i tried to power the LEDs with 5 volts. That made them bright enough so i went with that...
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The button comes in 2 parts which have to be assembled together. The first part is the thing you actually press (which also lets the light pass) and the second part is the Switch+LED combo. To make a neat package i modified the second part. By modified i mean i soldered a transistor to the pins to up the 3.3V logic level from the GPIOs of the controller to 5V needed for the LED. For that i just used a normal 2N2222 NPN-Transistor[^2].
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Soldered together the switches + transistor + some cables the "thing" looks something like this:
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{{< figure src="/img/buttons-switches-marked.jpg">}}
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The transistor is marked red, as the photo is to potato-quality to make it out otherwise :D
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| pin | connected to
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| -----------|------
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| 1 | GPIO (Switch)
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| 2 | 3.3V
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| 3 | 5V
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| 4 | GPIO (LED)
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| 5 | GND
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After hooking it up to the controller i had to change and add some parts of the configuration YAML of the esphome-firmware:
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```yaml
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light:
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- platform: monochromatic
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name: "Rote Led"
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output: led_rot
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id: rotled
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output:
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- platform: ledc
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id: led_rot
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pin: 14
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binary_sensor:
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- platform: gpio
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pin:
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number: 12
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inverted: True
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mode: INPUT_PULLUP
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name: "ButtonRot"
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filters:
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- delayed_on: 20ms
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on_click:
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min_length: 5ms
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max_length: 500ms
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then:
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- switch.toggle: relay1
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switch:
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- platform: gpio
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pin:
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number: 33
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inverted: True
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name: "Schreibtischlampe"
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id: relay1
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on_turn_on:
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then:
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- light.turn_on:
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id: rotled
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transition_length: 200ms
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on_turn_off:
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then:
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- light.turn_off:
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id: rotled
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transition_length: 500ms
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```
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The added parts in the on\_turn\_{on,off} sections of the switch turn the LED {on,off}.
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By hooking them up to the switch activation and not the button press the LEDs also turn on when the relay gets activated via the webserver.
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The "transition_length: ...ms" parameter makes the LED fade in and out smoothly (only works on an PWM GPIO).
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After that there only was a case to design and 3D print. I settled for the classic highly complex[^3] box shape design as you can see in the image above.
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As you can see in the image i have another blue button next to the red one... not really sure what to do with it right now, if i come up with something i will probably do another post about it here ;)
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{{< figure src="/img/buttons-anim.gif">}}
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[^1]: You can find them easily when you search ebay or any other site that sells electronics from china
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[^2]: [Sparkfun](https://learn.sparkfun.com/tutorials/transistors/applications-i-switches) describes the basic circuit quite good
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[^3]: "super complex"
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