No matter how good LCD and OLED display technologies are, they cannot replace this ancient display nixie tube

At this stage , No matter what LCD and OLED How good the display technology is , Can not replace this ancient display digital tube .

Because until now , Many fields are inseparable from digital tubes , The main reason is that it is very cheap 、 Stable , And the control is relatively simple , Let's talk about how simple the principle is , This is a digital tube , He has 8 paragraph ,A To G It shows numbers , And the first 8 paragraph DP Only decimal points can be displayed .

Each of his paragraphs is a led The lamp , When BC When on , It shows 1, When ABCDF When on , It shows 0, There are ten more pins ,3 Number and 8 Pin is connected to led The cathode of the lamp , The other pins are connected to the anode , Because the cathodes are all connected , So we call him a common cathode digital tube , If the anode is connected together by a common anode digital tube .

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3 Number and 8 The numbers are connected , Let's call it alpha com End , So how to control this digital tube ？ It's simple , Just need to make com Terminal grounding , Then connect these pins to the MCU , If you want to make a paragraph bright , Just give it a high level , If you don't want it to shine , Just give the low level , He and we control led Lights make no difference .

A digital tube is OK to say , But how to control multi digit nixie tubes ？ You see, he has so many pins , It can be seen as a package of four one digit digital tubes , It is also possible to adopt the control method just mentioned , But here we need 32 One pin , SCM pin resources are very valuable .

If 32 Each pin controls the nixie tube , It will cause a great waste of resources , Now , A clever man has come up with a very clever way , That is to light up the four digital tubes one by one , That is, when the first nixie tube is lit , rest 3 Off .

Then the second one is on , And so on , Will you see the nixie tube flickering ？ I won't , The flashing frequency between the nixie tubes is very fast , The human eye looks as if it's four lights together .

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At this time, his connection is like this , But at this time only 12 One pin ,Led The anode of the lamp is connected to 8 On one pin , The other four com The terminal is also connected to the pin of the MCU , Instead of connecting to the ground , If we want to control the first digital tube , Just take the first digital tube com End to low level , At the same time, the rest 3 One of the com High level .

because led If the cathode of is connected to a high level , In this way, he won't shine at all , Last , We just need to give this 8 Two pins output high and low levels , You can control this digital tube , remember , Which nixie tube do you want , You have to give it to a digital tube com Terminal low level .

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