Introduction: LCD1602 is an industrial character type LCD that can show 16*2, i.e. 32 characters. The character generator ROM in the LCD module has already stored 160 different characters in dot matrix, including Arabic numbers, letters in low and upper case, and common symbols. In IDE, a built-in library LiquidCrystal can be called directly, and you don't need to write it, which is pretty convenient for beginners. Its working voltage is 5V, and you can adjust the contrast via the 50K potentiometer. For the backlight, just connect pin A to 3.3V and K to GND, and then it will light up. Features: LCD display module with blue backlight Wide viewing angle and high contrast Built-in industry standard equivalent LCD controller LCM type: Characters Can display 2-lines x 16-characters Operate with 5V DC Material: FR4 + LCD Commonly used in: copiers, fax machines, laser printers, industrial test equipment, networking equipment such as routers and storage devices Pins of LCD1602 and their functions: VSS: connected to ground VDD: connected to a +5V power supply VO: to adjust the contrast RS: A register select pin that controls where in the LCD抯 memory you are writing data to. You can select either the data register, which holds what goes on the screen, or an instruction register, which is where the LCD抯 controller looks for instructions on what to do next. R/W: A Read/Write pin to select between reading and writing mode E: An enabling pin that, when low-level energy is supplied, causes the LDC module to execute relevant instructions. D0-D7: to read and write data A and K: Pins that control the LCD backlight Package included: 2* 3.3V 1602 16x2 Character LCD Display
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There is something wrong with these displays. Defiantly correctly wired as I purchased an alternative that worked perfectly in the circuit. However, both of these ran very hot and consumed 270ma rather than the 1.5ma expected to drive the LEDs. Backlight consumed 24ma when should be about 5ma.
However, I have to say that the company support department has been very attentive trying to understand the issue and trance the batch that they came from so they can assess what has happened.