176 Nextion Display tutorial waveform with min max number
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- เผยแพร่เมื่อ 22 ก.ย. 2024
- The code is available at this link - cheepcontrols.... It contains the individual files in the unzipped format and a single zipped file with all the files.
The base configuration is described better in this video • 174 Using the #nextio...
This week I have a video on the waveform. I had a request from a viewer to make a video displaying readings in multiple formats. You must make multiple calls to the display to write to multiple fields. I display an analog input 0-5v on a waveform and a float object. I also interpret the minimum and maximum values in separate float objects. It was short and straightforward
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great work as usual, can't wait to see the next video
Thank you for your kind words
Great vid as per usual. Even though I've been coding for decades (on and off) I still learn stuff from you. LOL
One example is Ternary Operators.
I don't know why, but I've never used them. I've always done the IF structures.
But now seeing it in use, I can see that it is very slick.
Mark, at one point, you were asking for ideas on projects. I'll assume that you mean projects that won't cost a lot of $$$.
I do have an idea that you might find interesting and perhaps even a bit challenging. And the Nextion is perfect for this. In fact, there are "minor" projects for this very thing.
That is, AD8232 Heart Rate Monitor.
There are a few good tutorials on this, but not done in your style of completeness.
More than that, however, and something that I plan on trying to do once I get to that project, is besides the usual and common code that is out there, is to add code that can analyze PQRST waves, tachycardia, bradycardia, etc.
I did some research on that a year or 2 ago and I did come across a guy who shows how to code this, but for one, I can't find that info at the moment, but I do remember that the math was out of my league. Yeah, I'm not super great at math. LOL
Anyway, just an idea I thought that I'd throw out there.
That is an interesting idea. I spent a little time looking into it and watching a video on it. I am not sure how I would show it working. Let me think on it and maybe we can discuss it over on email.
Great video
Glad you enjoyed it
@@CheapControls very much
Thats what i needdd thankyouuu
I am glad I was able to help
@@CheapControls hey can i used this math in this code but i used it without Nextion ? And used it with Serial Monitor?
Hi there what a great video it's really help alot for me! thank you so much! i am curious is it possible to change the value to display 0 instead of 2.3 while the position was in the middle?
I am not sure what you are asking. Is there a timestamp in the video you can give me so I can understand better?
@@CheapControls is at timestamp 10:12, can it convert it to +25000 -0- -25000 instead of 0-50000
That is a very good question. I have never sent a negative number to the Nextion. I am going to make next weeks video about sending a negative number to the Nextion. Sorry I can't answer the question today. I will have an answer soon. Watch for the video and maybe another reply to this comment
that's great! i have lean alot from you and it is very useful to me, thank you so much! waiting to see your next video:)
@@CheapControls hi I finally got the code done! By using this code and some edit, get negatives and positive thanks a lot hope can share with you
I want to get a smooth graph. Can I print 5 data in 1 second? ( k type termokupl )
what MCU are you using to send the data. I am pretty sure you can send the data very quickly.
@@CheapControls ESP32
The ESP32 should have the ability to update the waveform very quickly. More data at a quicker rate will make it appear smoother.
Can i use min() or max() function?
You can copy the code from the video or download it at cheapcontrols.com. Then you can adjust the code in anyway you want.
@@CheapControls Hey Bro i wanna ask something why i cant get string from Nextion when i use Serial2? But when i used Serial i still get the string
@@CheapControls also i wanna ask something why i get 1553,6 value of minVolt? Why i cant get a zero?
@@kuro4102 Do you have the Nextion connected to Rx/TX of the Arduino board or do you have it connected to 2 other pins, that you have the software serial set to those 2 pins?
I should ask which Arduino are you using?
Uno?
Nano?
Nano Every?
Mega 2560?
@@BlondieSL i used UNO and now i can used the Serial2 with Nextion but with different arduino code , now the problem is minVolt Array is contains 1553,6 but when i Serial.println voltIn it still 0 do you have solution?