NTC Thermistor Incubator Part 3: Integrating double digits 7-segment

This is a close to final version of my triplet NTC thermistors incubator with multi-buttons on a single analog input and double digits 7 segment output.  You may read part1 and part2, for the whole story. On a separated article, I replaced NTC thermistor and 7segment with LM35 probe and LCD 16x2, here.

Hardware setup

I use Arduino standalone on breadboard, common anode double digits 7 segment 16 pins, two 74HC595s, three NTC thermistors, an FTDI 5v uploader, an optocoupler protected relay module, resistors (10kΩ, 1kΩ, 4k7Ω, 470Ω, 220Ω and 47Ω), and push buttons.

Since the 7 segment that I purchased has no datasheet, it is important to look at other version of common anode (tandyonline.co.uk):


The final setup on breadboard:


The codes

You may grab the codes here

What next?

Obviously, the next step is to print a PCB (there is a great tutorial on the Tube, or if you understand Bahasa Indonesia, here is a great tutorial from Duwi) for this project and to assemble all the parts on it.

I will definitely give it a try when I have enough spare time for this hobby.
Have fun!

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