coffee: Add coffee maker post.

content/posts/coffee/index.md

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+---
+title: "DIY 'Smart' Coffee Maker"
+date: "2020-07-05"
+author: "William Floyd"
+featured_image: "media/20200702_120123.jpg"
+categories: [
+    "Hardware",
+    "Electronics",
+    "Hacking"
+]
+tags: [
+    "Hobby",
+    "Home Assistant",
+    "Home Automation",
+    "ESPHome",
+    "Coffee",
+    "IOT"
+]
+---
+
+I have recently (last couple months) been getting into home automation, specifically using Home Assistant.
+I also wanted to get a coffee maker that used K-Cups.
+Thus the goal was born - to get a coffee maker working with Home Assistant, such that I could automate it to fit my morning routine.
+
+I first searched for new coffee makers, looking to see what the easiest ones would be to hack into and automate.
+I got so far as adding a sleek new brand name model to my Amazon cart, but thankfully reason and frugality prevailed!
+Instead, I opted to swing by the local Goodwill the next day, to see what secondhand options might be available.
+As luck would have it, I found a no-frills, single button coffee maker for the princely sum of $4, and I was on my merry way.
+
+[![The Spoils of Goodwill](media/20200610_204856.jpg)](media/src/20200610_204856.jpg)
+
+***
+
+Later that evening, opening the black box up (thankfully I had the correct triangular screwdriver head), I found very easily hackable innards.
+
+[![Poor lighting is the worst...](media/20200610_205351.jpg)](media/src/20200610_205351.jpg)
+
+The control board ([front](media/20200610_205847.jpg), [back](media/20200610_205841.jpg)) is very simple - two buttons in parallel, an LED, and a couple resistors.
+I'm not quite sure what the logic is upstream (it un/latches on each press), but the buttons short to ground, and this is something I can work with.
+The control board has wires for ground, signal, and 5V, in that order.
+
+The ordeal of hacking into the thing, and my missteps trying to do so, is rather boring really, but it produced this:
+
+[![Interception!](media/20200702_120309.jpg)](media/src/20200702_120309.jpg)
+
+[![Perfboard](media/20200702_120302.jpg)](media/src/20200702_120302.jpg)
+
+[![D1 Mini](media/20200702_120328.jpg)](media/src/20200702_120328.jpg)
+
+The brains I added was a Wemos D1 Mini (thanks, Aliexpress!), with a 3.3V<->5V converter between to sense when the coffee maker is on, and also turn on a mosfet to short the button to ground.
+I initially had issues with the coffee maker turning on whenever I plugger the D1 Mini in, but a pulldown resistor solved this.
+
+[![External USB Plug](media/20200702_120334.jpg)](media/src/20200702_120334.jpg)
+
+I also opted for an external USB plug - this allows me to possibly reflash this without opening the enclosure, and also meant I did not need to splice into the mains line inside, which I was reluctant to do.
+
+I initially flashed and programmed the coffee maker with Tasmota, but almost immediately opted to use ESPHome instead.
+I like Tasmota and ESPHome, I was just able to get more fine control of the setup using ESPHome in this instance, especially concerning the button logic.
+
+The (important) code is as follows:
+
+```
+binary_sensor:
+  - platform: gpio
+    device_class: power
+    internal: true
+    id: power_on
+    pin: D2
+    
+switch:
+  - platform: gpio
+    pin: D1
+    id: relay
+    restore_mode: ALWAYS_OFF
+  - platform: template
+    name: "Coffee Maker"
+    icon: "mdi:coffee-maker"
+    lambda: |-
+      if (id(power_on).state) {
+        return true;
+      } else {
+        return false;
+      }
+    turn_on_action:
+    - switch.turn_on: relay
+    - delay: 50ms
+    - switch.turn_off: relay
+    turn_off_action:
+    - switch.turn_on: relay
+    - delay: 50ms
+    - switch.turn_off: relay
+```
+
+The beauty of the way in which I can detect signals and simulate a button press is that ESPHome senses when I use the physical button, and updates accordingly.
+I can use the coffee maker absolutely as normal, the 'Smart' part of it is optional.
+
+***
+
+The rest of my setup using this coffee maker is somewhat outside the scope of this post, but it includes using Tasker on my phone to run a 'Wakeup' automation on Home Assistant, which will  - along with turning on my bed-head lamp, and switching my monitor on before putting it to sleep - check if I turned on a 'Morning Coffee' user input.
+If I remembered to prep my coffee the night before, and turned on the switch, I will wake up to a hot cup of coffee (or, the sound of a coffee-in-progress).
+I can also command Alexa and Google Assistant to do my bidding and make me a coffee.
+At least someone does what I want...
+
+Truly, we are living in the future.

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