From 01f4c54653b7647f15e212f3041c504daf6c9401 Mon Sep 17 00:00:00 2001 From: Tucker Kern Date: Thu, 9 Nov 2023 08:19:15 -0700 Subject: [PATCH] Update README.md Add information about level shifter and host MCU voltage. --- README.md | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 3dab818..d764602 100644 --- a/README.md +++ b/README.md @@ -14,6 +14,7 @@ An ESPHome component for the Winix C545 air purifier. - ESP8266 may work but lacks a free [hardware UART](https://esphome.io/components/uart.html#hardware-uarts). - ESPHome 2023.10 or above - Older version may function but have not been tested. +- A bi-directional logic level shifter. - Winix C545 Air Purifier - Soldering iron, solder and some small wire. @@ -44,10 +45,12 @@ If your board differs, **STOP!** It is very likely you will damage the board if ### Wiring Using the photos as reference, connect the marked points to the ESP32 pins. +**NOTE: The host MCU uses 5 V logic so a level shifter is necessary to interface with the 3.3 V ESP32.** + | Board Point | ESP32 Pin | Notes | | ----------- | ----------- | ----- | -| TX | IO26 | WiFi UART Tx (WiFi->MCU) | -| RX | IO25 | WiFi UART Rx (MCU->WiFi) | +| TX | IO26 (via level shifter) | WiFi UART Tx (WiFi->MCU) | +| RX | IO25 (via level shifter) | WiFi UART Rx (MCU->WiFi) | | 5V | EXT_5V (5V) | 5 V Supply | | GND | Ground | Ground | | Q16 | N/A | WiFi RESETn
Tie to ground to disable OEM WiFi | @@ -59,7 +62,7 @@ Using the photos as reference, connect the marked points to the ESP32 pins. ![RESETn Point](docs/winix_c545_resetn.jpg) #### Final Assembly -![Final Assembly](docs/winix_c545_final.jpg) +TBD ### Configure ESPHome Node Use the [example configuration snippet](example.yaml) to configure your node.