![arduino lcd library source arduino lcd library source](https://www.iottechtrends.com/assets/uploads/2019/08/Code-Arduino-with-LCD.jpg)
In this tutorial we assume you're using a 5V microcontroller such as an Arduino, if your chip is runninag at 3v, you can basically just ignore the 4050 and do everything else! Here are the wire colors and the pins they go to: The pitch of the connector is 2mm which means it wont fit into a breadboard but wires are easy to add on. I'll use rainbow wires to make it a bit easier to tell apart but you can use whatever you'd like. We'll begin by soldering wires to the LCD.
![arduino lcd library source arduino lcd library source](https://cdn-images-1.medium.com/fit/t/1600/480/0*8Vr2sgBJEYvpt1NQ.jpg)
This pretty much means you can't use something with an SD card (like a Wave Shield or Data logger Shield at the same time you will straight-up run out of RAM and it will be wierd so dont bother). And if you're using a '328 note that half the RAM is going to the display so you wont have a lot left over. If you are using an ATmega168 or ATmega8 such as used in older Arduinos you must upgrade to a '328 to use this LCD. For some chips this is a little and some its a lot - you will need to check the micro's datasheet. So whatever microcontroller you use will need to spend 1024 bytes (1Kb) of RAM on the display memory. This means that the chip has to keep track of the display (the KS0108 lets you read or write).
Arduino lcd library source serial#
The biggest downside is that you can't read from the LCD in serial mode, only write.This means it uses waaay fewer pins (yay!)
![arduino lcd library source arduino lcd library source](https://arduinoliquidcrystal.readthedocs.io/en/latest/_images/LCD_bb.png)
Second, the interface is Serial (one bit at a time) instead of Parallel (8 bits at a time).This means a buffer chip or level shifting is necessary, you can use resistors or a chip like the 4050 (or equiv). For one the ST7565 runs at 3.3V not 5.As you can see there are a few differences.