Wi-Fi enabled displays for IoT applications

November 09, 2017 //By Jean-Pierre Joosting
4D Systems have announced the latest addition to their range of Internet of Display modules with its smallest LCD display yet. At 0.9-inch and powered by the popular Wi-Fi enabled ESP8266, it is ideal for miniature IoT projects.

Internet of Displays is a range of miniature feature rich displays that offer small colour displays with integrated Wi-Fi and a microSD/HDC slot. The IoD-09 is the 0.9-inch series of full colour, 80 x 160 pixel TFT LCD displays. It can display full colour images, animations and icons. The latest modules come in two variants: through-hole (IoD-09TH) and surface mount (IoD-09SM). The through-hole module is designed for hobbyists and prosumers, which can potentially be integrated quickly and easily into any product. The surface mount module is aimed at mass production integration.

The module is designed around the ESP8266 System-On-a-Chip (SoC) from Espressif. It comes with 802.11 b/g/e/I support as well as WPA/WPA2, WEP/TKIP/AES and STA/AP/STA+AP/P2P operational mode support. There are six GPIOs available allowing digital input/output as well as various communication protocols. Available interfaces include SPI, I2C, UART and 1-wire communications. A micro-SD slot allows the use of off-the-shelf high capacity memory cards from 4GB to a maximum of 32GB. FAT16 and FAT32 file accesses are supported. The module also comes with 4Mbit of flash memory for user application code and data, as well as 128Kb of SRAM (80Kb available for the user).

The IoD-09 series is highly recommended to be powered from a 4.0-V to 5.5-V source with 1-A current capability for display stability.