LCD display 2x16 characters - green - justPi

Alphanumeric LCD display manufactured by justPi. It presents values in two lines, 16 characters in each. It is powered by 5V. It is characterized by extremely simple operation, high availability and numerous support for many microcontrollers.

LCD display 2x16 characters - green - justPi.

Dimensions and pinout description.

Thealphanumeric display has 12 pins, which are not marked on the board. Each of them corresponds in turn to:

• 1 - VSS - system ground
• 2 - VDD - 5V power supply
• 3 - V0 - contrast
• 4 - RS - select display instruction register (low state) or data register (high state)
• 5 - R/W - read (low state) / write (high state)
• 6 - E - unlocking the display
• 7...14 - DB0...DB7 - data bus
• 15 - LEDA - backlight power supply 5 V
• 16 - LEDK - backlight system common ground

The display from justPi can be controlled in four modes:

• 8-bit without reading the busy flag - eight lines of the data bus and two control lines (RS, E - RW connected to GND) are needed for transmission,
• 8-bit with read busy flag - eight lines of the data bus and three control lines (RS, E, RW) are required for transmission,
• 4-bit with readout of the busy flag - for transmission four lines of the data bus and three control lines are needed (RS, E, RW),
• 4-bit without readout of the occupancy flag - for transmission four lines of the data bus and two control lines are needed (RS, E - RW connected to ground).

The most often chosen communication mode is the 4-bit mode without reading the busy flag. Sending half a byte saves valuable I/O pins of microcontroller - only four data lines are used (in 8-bit mode eight of them are occupied). Not reading the busy flag makes it necessary to use software delays, but saves another line - R/W. This pin can be permanently connected to ground, because data will be transported only one way - to the display.

The versatility of the display allows to choose also the most suitable way of control.

The display - rear view.

• Type: alphanumeric LCD display
• Supply voltage: 5 V
• Controller compliant with HD44780
• Backlighting: yellow-green, black characters
• Operating temperature range: from -20°C to 70°C
• Dimensions of one character: 2.45 x 5 mm
• Module dimensions: 80 x 36 mm

• LCD support using Arduino
• AVR library in C language
• STL project file for printing the base