Driving LCDs with Microcontrollers (Arduino) using LCD Drivers (AY0438)

Or how to coerce a LCD with 40 pins into showing some numbers …
↓↓↓ Complete description, time index and links below ↓↓↓

So I got myself some 3½ digit non-multiplexed LCDs (link below). And of course I wanted to display some numbers on them using my Arduino Nano. It was easy enough to find a suitable driver. So let’s start from there.

First I have a detailed look at the driver. It having a CMOS interface some bit banging with the Arduino follows. Then it’s time to address segments and finally to display numbers.

00:00 Intro – a nice LCD, but how to drive it with a microcontroller?
02:26 AY0438 LCD driver – its internals, how to wire it and how to drive it
12:43 Bit banging – the driver’s data, clock and load pins with an Arduino
21:21 Remarks – on daisy chaining AY0438s and the AY0438 Arduino library
26:21 Mapping pins – of the LCD and the AY0438 in software
31:58 Displaying numbers – by extracting numerals and mapping to segments
39:03 Power consumption – is low and measured in μA
39:39 AY0438 "AC" generation – without negative voltages to ground

Tutorials: https://www.youtube.com/playlist?list=PLwq-2MnM58FKn3920rc1V0qoTsQDheTIw
Mailbag: 3½ and 4 Digit LCDs (Tested), Thermocouple Connectors and More: https://youtu.be/FwDqEmZu9Ww
My Arduino code https://drive.google.com/drive/folders/1fuFXEvtTfkzIPaH96zMdSInuGgUs8282?usp=sharing

#robertssmorgasbord #tutorials #tutorial #how-to #LCD #driver #microcontroller #MCU #Arduino #AY0438

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