dsx2016/lcd1602atest
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Document LCD1602 contrast pot, backlight readability, and usage notes.

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Clarify Vo is hardware-only, backlight-off is usually unreadable on blue/white modules, and refresh meta/changelog.

Co-authored-by: Cursor <cursoragent@cursor.com>
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DESKTOP-PUHFO60\dsx2016
2026-10-23 14:36:36 +08:00
parent 1817fce92b
commit 81caf7c95a
3 changed files with 35 additions and 11 deletions
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firmware/README.md
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板子：**CYD ESP32-2432S028R**（ILI9341）
功能：LCD1602A I2C（SDA=GPIO22，SCL=GPIO27，PCF8574）+ SoftSPI 触控 + LVGL
说明见仓库根目录 [`README.md`](../README.md)（对比度电位器、背光、Map 脚位）。
## 刷写
```powershell

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firmware/cyd/meta.json
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{
"boardId": "esp32-2432s028",
"name": "CYD LCD1602A",
"summary": "LCD1602A HD44780 via PCF8574 I2C: SDA GPIO22, SCL GPIO27 — demo / hello / clear / backlight",
"description": "SoftSPI touch + LVGL. LCD1602A character LCD on I2C backpack (scan 0x27/0x3F).",
"summary": "LCD1602A HD44780 via PCF8574 I2C: SDA GPIO22, SCL GPIO27 — demo / hello / map / backlight; contrast = blue pot only",
"description": "SoftSPI touch + LVGL. LCD1602A character LCD on I2C backpack (scan 0x27/0x3F). Contrast is hardware pot (Vo), not software. Backlight off usually unreadable on blue/white modules.",
"tags": ["lcd1602a", "hd44780", "pcf8574", "i2c", "display", "touch", "lvgl"]
}