99 lines
5.2 KiB
Markdown
99 lines
5.2 KiB
Markdown
# Hauslane UC-PS18 external component
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This ESPHome external component allows control of a Hauslane UC-PS18 range
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hood by manipulating its front panel buttons and by reading the communications
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from the front panel to the main control board.
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## Setup
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### Hardware
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You will need the following hardware to wire up the range hood:
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- 1x ESP device such as ESP32-C3 Super Mini
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- 5x optocouplers such as 4N35\*
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- 5x resistors 1 $k\Omega$
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- 1x PNP transistor such as 2N3906
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- 1x 2cm $\times$ 8cm perforated prototype board
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\*I used 4N35 optocouplers in my build because that is what I had on hand, but
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they are overkill for this application since they are only used to "press" the
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front panel buttons, which uses very slow switching speeds of >250 ms. If I were
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patient, I would have waited for the much cheaper PC817 which should be more
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than sufficient for this task. That said, I do not guarantee that it wlll work
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with PC817 optocouplers. I suggest doing a test on one of the buttons using a
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breadboard before making a more permanent installation.
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[YouTube video](https://youtu.be/M4eqwwUxp7Q)
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For safety, unplug the range hood from the AC power source before taking it
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apart. Remove the drip tray and the washable baffle filters. Use a screwdriver
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to remove the 8 screws from the fan cover assembly and remove the cover. You
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can then remove the 2 screws from the light assembly to detach the lights.
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Be careful to support the light assembly as you remove the screws as each bulb
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is attached to a cable. Detach the cables to remove the light assembly and put
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it aside. This should expose two more screws on the bottom by the front panel.
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Remove the screws and unclip the 3-wire harness connecting it to the main
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conrol board, and you can gently pull the front panel assembly out. The front
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panel is screwed into a plastic box with two smaller screws. Remove the
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small screws to remove the front panel control board from the assembly.
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On the front of the panel find where the 3-wire harness connects to the board.
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Flip the board to the back and identify the solder points on the back. From
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left to right, these are GND, TX, and 5V. To power the ESP32-C3 (or the
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variant of ESP board you are using) from the panel, connect GND on the
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panel to GND on the ESP32-C3 and 5V on the panel to 5V on the ESP32-C3. To read
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the state of the fans and lights, connect the transistor's emitter (on the
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2N3906 this is the leftmost leg with the flat side facing you) to RX on GPIO 6
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of the ESP32-C3. The transistor's base (middle leg) connects to the TX point on
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the front panel board, and the collector (rightmost leg) attaches to GND either
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at the front panel board or on the ESP32-C3.
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Each buttton is a capacitive spring with a single connection point to the
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front panel control board at the spring's base. Shorting this point to ground
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discharges the spring and acts as a press -- or more accurately a touch -- of
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the button. In theory, a transistor can do the job here too, but the leakage
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from the transistor will influence the capacitive spring and will not register
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presses reliably. Instead, wire the output side of the optocoupler by
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connecting the spring to the optocoupler collector and ground to the optocoupler
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emitter. On the input side, connect GPIO pin->resistor->optocoupler anode
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in series and the optocoupler cathode to ground. These can be done using GPIO
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0, 1, and 3-5 on the ESP32-C3. Avoid pin 2 if using the ESP32-C3 as it is a
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strapping pin and will cause issues with detecting button presses. The sample
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configuration YAML assumes the timer button is on GPIO 0, up botton on GPIO 1,
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down button on GPIO 3, light button on GPIO 4, and power button on GPIO 5, but
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these can be configured in YAML.
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Since a lot of new connections will need to be made to ground, I recommend using
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something like a perforated prototype board and make a single connection to
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ground from the prototype board to the front panel control board, then connect
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all other grounds needed for the circuiti to each other using the prototype
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board. A 2cm$\times$8cm board fits perfectly in the empty space below the front panel in the front panel assemple. I also made all connections to the back of
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the front panel control board with wires with female Dupont connectors, then
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used male headers on the prototype board so that the additional circuitry can
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easily be removed.
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Once you have everything connected, reassemble the range hood.
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### Software
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Use the [uc-ps18.yaml](uc-ps18.yaml) sample configuration and change any options
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such as Wi-FI and API settings to match your preferences. If you are using
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different pins or a different model of ESP board, make sure to change those
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blocks in the YAML file. Flash the ESP32-C3 using ESPHome. The `command` API
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can be used to control the device, or you can interface the device with
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something like Home Assistant for a graphical user interface. Each button on
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the board can be pressed by using `command X`, where `X` is one of `timer`,
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`up`, `down`, `light`, or `power`.
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### Licensing
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The ESPHome component code is distributed under the [GNU General Public License
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version 3](LICENSE).
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