feat(hardware): ESPHome Gree IR blaster (Wemos D1 Mini + Grove IR)

Native ESPHome gree climate component over the API, no MQTT/Broadlink/Tuya.
HA on piha runs as a plain Docker container (not HAOS), so ESPHome is a
manual docker compose run --rm invocation, not a managed service — device
is deliberately not registered in hosts/piha/services.yaml.

.gitignore

@@ -3,6 +3,10 @@
 *.env
 !*.env.example
 
+# ESPHome secrets
+secrets.yaml
+!secrets.yaml.example
+
 # IDE artifacts
 .idea/
 .vscode/

hardware/esp/ir-ac-ha-integration/README.md

@@ -0,0 +1,87 @@
+# Gree IR Blaster
+
+ESPHome firmware for a Wemos D1 Mini (ESP8266) driving a Gree air conditioner
+over IR, exposed to Home Assistant via the native ESPHome API (no MQTT, no
+Broadlink, no Tuya).
+
+## Hardware
+
+- Wemos D1 Mini (ESP8266)
+- Grove IR Emitter
+- Grove IR Receiver
+
+### Wiring
+
+| Grove module | Pin | Wemos D1 Mini |
+|---|---|---|
+| IR Emitter | SIG | D5 |
+| IR Emitter | VCC | 5V |
+| IR Emitter | GND | GND |
+| IR Receiver | SIG | D6 |
+| IR Receiver | VCC | **3V3** — not 5V, ESP8266 GPIO is not 5V-tolerant |
+| IR Receiver | GND | GND |
+
+## Home Assistant / deployment model
+
+HA on piha runs as the `home-assistant:stable` Docker container, not HAOS, so
+ESPHome is **not** installed as an add-on. It runs as a one-off container via
+`docker compose run --rm` — there is no ESPHome daemon on piha. Compile/flash
+is a manual, operator-triggered action; this device is intentionally **not**
+registered in `hosts/piha/services.yaml`.
+
+Once flashed, the device advertises itself via mDNS and shows up as a
+discoverable ESPHome device in Home Assistant (Settings → Devices & Services
+→ Add Integration → ESPHome).
+
+## First flash (USB)
+
+1. Copy `secrets.yaml.example` to `secrets.yaml` and fill in `wifi_ssid`,
+   `wifi_password`, `fallback_password`.
+2. Wire the board as above and plug it into piha via USB.
+3. Run:
+   ```
+   ./deploy.sh --usb
+   ```
+   This flashes over `/dev/ttyUSB0`.
+
+## Subsequent flashes (OTA)
+
+Once the device is on WiFi, redeploy without `--usb`:
+```
+./deploy.sh
+```
+This runs `docker compose run --rm esphome run gree-ir-blaster.yaml`, which
+flashes over the network via the ESPHome OTA protocol.
+
+## Identifying the Gree protocol variant
+
+The `climate: platform: gree` component needs a `model:` matching your AC's
+remote protocol. `gree-ir-blaster.yaml` currently ships with `model: yan` as
+a starting guess — this is **not verified** and must be confirmed against the
+actual remote.
+
+To identify the correct variant:
+
+1. Flash the firmware and let the device boot (WiFi connected).
+2. Tail the logs:
+   ```
+   docker compose run --rm esphome logs gree-ir-blaster.yaml
+   ```
+3. Point the physical Gree remote at the Grove IR Receiver and press a button
+   (e.g. power on, or change temperature). `dump: all` on `remote_receiver`
+   causes ESPHome to log the raw/decoded IR data it captured.
+4. Compare the decoded output against the known Gree variants supported by
+   ESPHome and pick the closest match:
+   - `generic`
+   - `yan`
+   - `yaa`
+   - `yac`
+   - `yac1fb9`
+   - `yx1ff`
+   - `yag`
+5. Update `model:` in `gree-ir-blaster.yaml` to the matching variant, then
+   redeploy (`./deploy.sh`) and verify the AC responds correctly to commands
+   sent from Home Assistant (power, mode, temperature, fan speed).
+
+If none of the variants behave correctly, capture the raw IR dumps and check
+the ESPHome `gree` component issue tracker / docs for newer variants.

hardware/esp/ir-ac-ha-integration/deploy.sh

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+#!/bin/bash
+set -e
+
+# Manual deploy only — this device is not managed via hosts/piha/services.yaml.
+# Run by hand on piha after wiring the board.
+cd "$(dirname "$0")"
+
+if [ ! -f secrets.yaml ]; then
+  echo "ERROR: secrets.yaml missing. Copy secrets.yaml.example to secrets.yaml and fill in wifi_ssid/wifi_password/fallback_password." >&2
+  exit 1
+fi
+
+USB=false
+if [ "$1" = "--usb" ]; then
+  USB=true
+fi
+
+if [ "$USB" = true ]; then
+  if [ ! -e /dev/ttyUSB0 ]; then
+    echo "ERROR: /dev/ttyUSB0 not found. Plug in the board via USB for the first flash." >&2
+    exit 1
+  fi
+  echo ">>> First flash over USB (/dev/ttyUSB0)..."
+  docker compose run --rm --device /dev/ttyUSB0 esphome run gree-ir-blaster.yaml --device /dev/ttyUSB0
+else
+  echo ">>> OTA flash over WiFi..."
+  docker compose run --rm esphome run gree-ir-blaster.yaml
+fi

hardware/esp/ir-ac-ha-integration/docker-compose.yml

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+# Not a daemon — no `up -d`. ESPHome compiles/flashes and exits.
+# Invoke via deploy.sh, which wraps `docker compose run --rm esphome ...`.
+services:
+  esphome:
+    image: ghcr.io/esphome/esphome:stable
+    volumes:
+      - .:/config

hardware/esp/ir-ac-ha-integration/gree-ir-blaster.yaml

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+esphome:
+  name: gree-ir-blaster
+  friendly_name: Gree IR Blaster
+esp8266:
+  board: d1_mini
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+  ap:
+    ssid: "Gree-IR Fallback"
+    password: !secret fallback_password
+logger:
+api:
+ota:
+  platform: esphome
+remote_transmitter:
+  pin: D5
+  carrier_duty_percent: 50%
+remote_receiver:
+  pin:
+    number: D6
+    inverted: true
+    mode:
+      input: true
+      pullup: true
+  dump: all
+climate:
+  - platform: gree
+    name: "Klimatyzacja"
+    id: gree_ac
+    model: yan

hardware/esp/ir-ac-ha-integration/secrets.yaml.example

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+# Copy to secrets.yaml and fill in real values. secrets.yaml is gitignored —
+# never commit it. Filled in manually on piha.
+wifi_ssid: "your-wifi-ssid"
+wifi_password: "your-wifi-password"
+fallback_password: "your-fallback-ap-password"