ATMEGA328P 7 segment generic display

Two lines of 4 digits 7 segment display using ATMEGA328P chip (Arduino UNO) can be used as clock with external RTC or as general display.

Alexander Stepanov

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Description

I want to create 7 segment display that can be used for different purposes. For example as timer, clock or voltage/current display for DIY PSU. So LDS-3492AX (exactly like YSD-439AR6B-35 from SparkFun) 4 digits 7 segment display was chosen because it has colon and apostrophe, so clock and temperature can be nicely displayed.

Of cause I am aware of 7 segment display controller ICs like MAX7219. But it is no easy way to use such IC for display with colon and apostrophe, especial if you want brightness control and same brightness for colon and apostrophe as for digits. So I choose to use Atmega328p chip. This will allow to use this display as slave writing digit values via I2C or standalone as clock, with temperature sensor or anything else.

Details

So what you see here is Schematic and PCB and example Arduino sketch of clock implementation with external RTC module. There are also Gerber files for Seeedstudio Fusion PCB service so you can easily produce PCB only for 5$ (not including shipping)

Generally PCB can be used with common anode 7 segment display as well as with common cathode 7 segment display. You only will need to use right type of transistors and connect J5 jumper accordingly.

I did mistake with buttons location. Actually I wanted them at the bottom. Anyway I will do additional version of PCB with buttons located at the right side of 7 segment displays.

I am not providing explanations other then schematic and example of code currently because I don't sure if anyone will be interested. But I will add explanation on request.

Files

clock_V1p1_pcb.zip Eagle files V1.1 x-zip-compressed - 568.72 kB - 01/20/2018 at 13:41		Download
clock_v1p1.zip Arduino sketch V1.1 x-zip-compressed - 786.88 kB - 01/20/2018 at 13:39		Download
clock.zip Arduino sketch x-zip-compressed - 5.76 kB - 05/02/2017 at 14:37		Download
mydisplay3_pcb.zip Eagle files x-zip-compressed - 512.44 kB - 05/02/2017 at 14:36		Download

Components

2 × LDS-3492AS 4 digit 7 segment display
1 × SN74HC595N Shift Register
1 × 16 MHz Crystal
1 × ATmega328P Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
8 × 2N2222 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs

Project Logs

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Clock V1.1
Alexander Stepanov • 01/20/2018 at 13:35 • 0 comments
Version 1.1
Alexander Stepanov • 01/20/2018 at 12:35 • 0 comments

In this version I moved buttons to the right and replaced light sensor with buzzer
Clock
Alexander Stepanov • 06/01/2017 at 17:50 • 0 comments