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--- projects:arlec_smart_fans:overview [2023/10/30 03:35] – created tjhowse
+++ projects:arlec_smart_fans:overview [2023/11/01 04:57] (current) – tjhowse
@@ Line 2: / Line 2: @@
 ====== Smart fan ======
-I bought an Arlec smart fan. It has a WR4 wifi module inside, supposedly based on an RTL8710BN. These are now supported by esphome.
+I bought an Arlec smart fan. It has a WR4 wifi module inside, based on an RTL8710BN. These are now supported by esphome.
+https://docs.libretiny.eu/docs/platform/realtek-ambz/#flashing
+https://community.home-assistant.io/t/arlec-grid-connect-ceiling-fans/261127/67
+https://esphome.io/components/libretiny.html
+https://developer.tuya.com/en/docs/iot/wifiwr4module?id=K9605tvu78p3e
+{{:projects:arlec_smart_fans:pasted:20231030-112019.jpeg}}
+{{:projects:arlec_smart_fans:pasted:20231030-112042.png}}
+{{:projects:arlec_smart_fans:pasted:20231030-033719.jpeg}}
+{{:projects:arlec_smart_fans:pasted:20231030-080404.png}}
+{{:projects:arlec_smart_fans:pasted:20231030-080423.png}}
+{{:projects:arlec_smart_fans:pasted:20231101-045735.png}}
+<code>
+esphome:
+  name: fan-1
+  friendly_name: Sam's Room Fan
+rtl87xx:
+  board: generic-rtl8710bn-2mb-788k
+# Enable Home Assistant API
+api:
+  encryption:
+    key: "<snip>"
+ota:
+  password: "<snip>"
+wifi:
+  ssid: !secret wifi_ssid_2
+  password: !secret wifi_password_2
+uart:
+  rx_pin: GPIO18
+  tx_pin: GPIO23
+  baud_rate: 9600
+tuya:
+fan:
+  - platform: "tuya"
+    name: "Speed"
+    switch_datapoint: 1
+    speed_datapoint: 3
+    direction_datapoint: 4
+    speed_count: 6
+light:
+  - platform: "tuya"
+    name: "Light"
+    switch_datapoint: 9
+    dimmer_datapoint: 10
+    min_value: 0
+    max_value: 100
+    color_temperature_datapoint: 11
+    color_temperature_max_value: 100
+    cold_white_color_temperature: 150 mireds
+    warm_white_color_temperature: 400 mireds
+</code>
+Initial flashing done with a USB-TTL serial adaptor using the wiring diagram shown above and ltchiptool. I took a backup of the stock firmware with <code>ltchiptool flash read ambz stock.bin</code> then I used esphome to generate the uf2 file and flashed it using <code>ltchiptool flash write <filename>.uf2</code>
+ Works mostly perfectly. OTA updates via wifi only work occasionally, perhaps inside a 30-60 second window after the RTL chip powers on. It takes a fair bit of bouncing the power and retrying the connection to get it to stick.