Many developers and students are developing electronic products at home or in the laboratory using micro-controller kits which are easily available. For most of their products, they are requiring a display, which will quickly indicate whether the product is working as desired. An LCD module is preferred since it is less likely to be damaged. Arduino is one of the most popular kits available, and many of the product developers are looking for a display which is compatible. The Geekcreit LCD Screen Module has been specially developed and tested with Arduino kits and displays the results required clearly.
The Geekcreit LCD 12864 Screen Module uses the control chip SSD 1306. Though the chip has a physical area of 27.3 mm X 27.8 mm, the display area is smaller at 21.744 X 10.864 mm, with the length approximately 0.96 inches. The default serial peripheral interface (SPI) of the module uses four wires. The switchable resistor at the rear can be used to convert it into a three wire SPI or inter-integrated circuit (IIC) interface. The display has a total of seven pins. The display color is yellow and blue. The display will function properly for a temperature range between -70 degree and 40-degree centigrade. The module is lightweight, weighing only five grams.
The module requires a power supply of between 3.3 V and 5 Volts. There are four different ways of wiring the display module to the Arduino devices. When the SPI is used all the seven pins of the module are connected, either the Micro-controller hardware or the Analog module may be used for inputs to the SPI interface of the display. When the Micro-controller or Analog IIC are being used, only five pins are wired to the display, the chip select and data command select pin are connected to the power ground. So depending on the inputs which are available, five or seven wirings should be used.
When there is only one device on the SPI bus, the chip select (CS) pin can be grounded. This ensures that one IO is not required. When the IIC interface is used, a data/ command pin can be grounded. The pins on the module are clearly labeled to indicate their functionality, GND – to indicate power ground, DCC, power supply, D0 for clock line for IIC, SPI interface, D1 for data line for both SPI, IIC. RES is used for the reset command, it is necessary to reset the OLED after it is switched on. DC is used for selecting the data or command only for the SPI connection and may be used for setting IIC address. The CS pin is used in the SPI mode for chip select, it is an active low pin, and must be grounded when not in use.
Most of the customers who have purchased the Geekcreit 0.96 inch Screen module are extremely satisfied with the product quality and price. So this module is highly recommended for hobbyists, students who require an inexpensive display.