2.4” QVGA Touch Display

IoT-Bus Display

This a nice 2.4” 320x240 QVGA TFT Touch Display offering plug and play display output and touch sensing together with a 4-bit SDMMC SD Card. We picked 2.4” over 2.8” as it has a crisper display at 320 x 240 resolution and its slightly smaller size helps in IoT applications. Designed primarily for development use it has an IoT-Bus socket at the side for easy access. Here’s the back view:

IoT-Bus Display

Buy it in the oddWires store…

Pins Used

IOT-Bus Pin Description
2 DAT0 (SD Card)
4 DAT1 (SD Card)
5 SS (TFT)
12 DAT2 (SD Card)
13 DAT2 (SD Card)
14 CLK (SD Card)
15 CMD (SD)
16 SS (Touch Screen)
17 IRQ (Touch Screen)
18 SCK (TFT)
27 DC (TFT)
33 Backlight (TFT) - you will not see anything if you do not turn on the backlight!
3V3 Power
GND Ground


This board uses a lot of pins if you are using everything. If you are not using the SDCard then those pins may be freely used. You can also use the SCard in one pin mode freeing up DAT1, DAT2 and DAT3. If you are not using the touch capabilities of the module then you can utilize those pins. IRQ is not used by the forked version of the XPT2046 library freeing up pin 17. The current versions of the IoT-Bus CAN Bus and LoRa modules cannot be used with this display.


Name Description Framework
Adafruit_ILI9341 Arduino Adafruit’s ILI9341 library - use with Adafruit-GFX-Library.
Adafruit-GFX-Library Arduino Adafruit’s general purpose graphics library.
TFTeSPI Arduino Bodmer’s TFT library has been forked to setup defaults.
XPT2046_Touchscreen Arduino Fork of Paul Stoffgren’s XPT2046_Touchscreen library.
ESP32_TFT_library esp-idf loboris TFT library for ESP32


IoT-Bus Display Schematic

Click image to enlarge.


Name Description
Espressif32 Espressif Systems is a privately held fabless semiconductor company. They provide wireless communications and Wi-Fi chips which are widely used in mobile devices and the Internet of Things applications.


Name Description
Arduino Arduino Wiring-based Framework allows writing cross-platform software to control devices attached to a wide range of Arduino boards to create all kinds of creative coding, interactive objects, spaces or physical experiences.
ESP-IDF Espressif IoT Development Framework. Official development framework for ESP32.