fishingbas.blogg.se

The module ships with the male header strip loose. This pin enables writing to the display when active LOW This pin is grounded to keep it in write mode at all times.

Connect to approximately a 20K potentiometer between 5V and ground to adjust contrast of the display This can come from the MCU or be a separate power supply. This ground needs to be in common with the MCU

Module ConnectionsĬonnection to the display is via a 16-pin header. If it is desirable to minimize the pins used on the MCU even further, check out the version with an I2C interface down below which uses only 2 pins plus power and ground. The LiquidCrystal.h library makes the difference between using the two modes transparent to the user. In practice, the 4-bit mode is normally used as it saves 4 pins on the MCU and maximizing communication speeds with the display are generally not a concern. 8-bit mode uses data pins D0-D7 and 4-bit mode uses the upper data pins of D4-D7.

This display incorporates a parallel interface that can operate using an 8-bit (byte) mode or a 4-bit (nibble) mode. The backlight can be driven by a logic pin using a transistor if PWM brightness or ON/OFF control is desired Parallel Interface It can be operated off the 3.3V line if a lower brightness is desired for the application. The backlight can go down to about 3.2V before it goes out. The backlight includes a 51 ohm current limiting resistor, so an external resistor is not required. Normally 5V is applied to ‘A’ and ground to ‘K’. The backlight is powered off the A (Anode) and K (Cathode) pins. If this is not adjusted correctly the display may not show any characters or solid blocks may be displayed. The wiper output of the potentiometer feeds the VO pin with a variable voltage that sets the contrast. The potentiometer can be somewhere in the 10K-50K range and should connect between 5V and ground. The backlight has a VO (Display Contrast) input for connecting a potentiometer for adjustment of the contrast of the display for best viewing. Custom characters can be defined and used with the display. Each of the characters are composed of a 5 x 8 dot matrix for good character representation. The display is composed of a 16 character x 2 line LCD display with a blue backlight and white characters. For an interactive display, pairing this type of display with a rotary encoder to navigate and select menu items on the display can provide a very nice user interface. These displays are straightforward to use and are a great way to provide a user interface on many projects where you need more info than simple LED indicators or 7-Segment displays can provide since these are full alphanumeric displays with 2 lines of 16 characters each for a total of 32 characters. KEY FEATURES OF LCD1602 16×2 BLUE LCD DISPLAY : The LCD1602 16×2 Blue LCD Display provides a 16 character x 2 line LCD with parallel interface for control by an MCU.