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Firgelli Robots LCD 2004 Shield Module with Parallel Interface

LCD 2004 Shield Module with Parallel Interface


LCD 2004 Shield Module with Parallel Interface


This 20-character, 4-line parallel liquid crystal display provides a large viewing area. It features white text on a blue background OR black text on yellow green background with an LED backlight and uses the common HD44780 parallel interface.

Pin out:

Pin Symbol Function
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


This LCD has an LED backlight. The voltage drop across the LEDs is typically about 3.2 V and the recommended current through the LEDs is 72 mA. This LCD includes a 25.5 Ω resistance (two 51 Ω resistors in parallel) in series with the backlight, so an external current-limiting resistor is not required for backlight supply voltages up to 5 V. For higher voltages, you should add a current-limiting resistor RLIMIT as shown above where:

RLIMIT = (VBACKLIGHT – 3.2V) / 0.072A – 25.5Ω

Any voltage above the diode-drop voltage will work (as long as you choose the appropriate value for your external current-limiting resistor for voltages over 5 V). You can also use a PWM-controlled MOSFET to achieve variable dimming of the backlight if so desired.

0.5 lb

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