Quelltext der Seite WSAL16446 – 2.8inch Resistive Touch LCD/en

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
The 2.8-inch IPS LCD with a resistive touch panel provides 320 × 240 pixels and communicates via a 4-wire SPI bus. The display driver defaults to ST7789; HX8347D is the alternative. The XPT2046 touch controller supports 12-bit ADC at 125 kHz sampling and also provides temperature and battery-voltage measurements.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL16446 WSAL16446 – 2.8inch Resistive Touch LCD, 320×240]

== Technical overview ==
* Display resolution: 320 × 240 pixels, IPS panel, 65K colors (RGB).
* Interface: 4-wire SPI with CPHA=0, CPOL=0; data transmitted MSB-first.
* Default driver ST7789; switch to HX8347D by editing the defines on lines 80/81 of LCD_Driver.h if the display does not render.
* Touch controller XPT2046: 12-bit ADC at 125 kHz, I/O range 1.5–5.25 V, on-chip temperature sensor, battery monitoring 0–5 V.
* Dimensions: overall 79.9 mm × 50.8 mm, active display area 57.6 mm × 43.2 mm.
* Power: 5 V for the panel, 3.3 V logic level; LED backlight with programmable control via LCD_BL.
* Pins: 5V, GND, MISO, MOSI, SCLK, LCD_CS, LCD_DC, LCD_RST, LCD_BL, TP_CS, TP_IRQ.
* Compatible with OpenX05R-C, OpenM128, Open103C, and PIC-based boards (Open16F877A / Open18F4520); pin mappings differ per board.
* Touch calibration is performed with a stylus after launching the demo; drawing becomes possible afterwards.

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
#define ST7789_DEVICE  // Zeile 80 in LCD_Driver.h (standardmäßig aktiv)
//#define HX8347_DEVICE  // Zeile 81 in LCD_Driver.h (kommentiert aus, aktivieren zum Umschalten)
</syntaxhighlight>

== Notes and version constraints ==
* Driver switching requires editing LCD_Driver.h; exact line numbers may vary by firmware version.
* Demo projects are tied to specific development boards; verify correct pin mapping before flashing.
* Calibration is version-sensitive: if calibration fails, the driver or firmware may need updating.
* No warranty, certification, or safety-compliance information is present in the source; these must be verified separately.

== Source and revision record ==
* [https://www.waveshare.com/wiki/2.8inch_Resistive_Touch_LCD 2.8inch Resistive Touch LCD - Waveshare Wiki]
* Source revision: 76384
* Captured: 2026-08-31T03:30:33+00:00
* SHA-256: <code>1b1bcbe31906306a572f0f377135671c4e1f9cacbbe74d32d27df85dd56f1542</code>