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Pololu 772 - 16x2 Character LCD with LED Backlight (Parallel Interface), Black on Green
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  • Pololu 772 - 16x2 Character LCD with LED Backlight (Parallel Interface), Black on Green
ID: 195335

16x2 Character LCD with LED Backlight (Parallel Interface), Black on Green

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Kamami is the official distributor of electronic modules and Pololu robotic parts. All products of this brand in our offer are original and come directly from the manufacturer.

16x2 Character LCD with LED Backlight (Parallel Interface), Black on Green

This 16 × 2 LCD packs 32 characters into an outline smaller than that of most two-line displays. An LED backlight enables optimal viewing in all lighting conditions. This unit uses the HD44780 interface found on most parallel character displays.

Overview

This 16-character, 2-line parallel liquid crystal display achieves a large viewing area in a compact package. It features a yellow-green LED backlight and uses the common HD44780 interface (330k pdf), so sample interface code is widely available for a variety of microcontrollers. This LCD is also available without a backlight.

The DDRAM address 0x00 corresponds to the first character of the top line, address 0x0F corresponds to the last character of the top line, address 0x40 corresponds to the first character of the second line, and address 0x4F corresponds to the last character of the second line.

You can find sample HD44780 LCD interface code written for a variety of AVR microcontrollers as part of the Pololu AVR library.

Pinout

PinSymbolFunction
1 Vss ground (0 V)
2 Vdd 5 V logic supply voltage
3 Vo contrast adjustment
4 RS H/L register select signal
5 R/W H/L read/write signal
6 E H/L enable signal
7-14 DB0 – DB7 H/L data bus for 4- or 8-bit mode
15 A (LED+) backlight anode
16 K (LED-) backlight cathode

Using Contrast and the Backlight


As shown in the diagram above, a potentiometer whose output is connected to Vo will allow you to set the contrast for optimal viewing of your display.

The backlight in this LCD is composed of LEDs in series. The total voltage drop across these LEDs is typically 4.2 V and the recommended current through the LEDs is 120 mA. You should use a current limiting resistor RLIMIT as shown above where:

RLIMIT = (VBACKLIGHT – 4.2V) / 0.12A

In the diagram above, VBACKLIGHT is shown as 5 V, but you are not restricted to 5 V; any voltage above the diode-drop voltage will work as long as you choose the appropriate value for your current-limiting resistor. You can also use a PWM-controlled MOSFET to achieve variable dimming of the backlight if so desired.

Note: No cables or connectors are included with this product, but a 40×2-pin 0.100" male header strip and 20", 16-conductor ribbon cable can be purchased separately. You can break a 7×2 segment from the header strip and solder it to the 14 through-holes on the left side of the LCD PCB; the ribbon cable will then plug into the header pins (leaving two holes empty). The header pins won’t enforce proper orientation of the cable, so you will need to take care to plug it in to the correct pins. The 8×2 shrouded box header will not work with this LCD.

People often buy this product together with:

'0.100" 0.100" (2.54 mm) Breakaway Male Header: 2x40-Pin, Straight
'16-Conductor 16-Conductor Ribbon Cable with IDC Connectors 20"
'0.100" 0.100" (2.54 mm) Breakaway Male Header: 1x40-Pin, Straight
195335

Manufacturer BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20

Responsible person BTC Korporacja sp. z o. o. Lwowska 5 05-120 Legionowo Poland sprzedaz@kamami.pl 22 767 36 20

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