(Solved) Serial data coming in need to organize it into data on a screen.

Projects Programming
21

Hi Robin2

Ok code amended.

I am now on the serial monitor getting a 0 or a -18 when I send the line of code through.

But I am not getting ANY change on the nextion screen........

even if I comment out the //Serial.println(AHVal); so that the next line is Serial2.print("j2.val=");and then
Serial2.print (AHVal);

Am I missing something?
AHVal has been declared.

void showNewData() {
    if (newData == true) {
        //Serial.print("This just in ... ");
        AHVal = atoi(receivedChars); //convert to int
        AHBarValue = map (AHVal, 0, -30, 100, 0);
        Serial.println(AHVal);
        Serial2.print ("j2.val=");
        Serial2.print (AHVal);
        Serial2.print (0xff);
        Serial2.print (0xff);
        Serial2.print (0xff);
        newData = false;

Can you help me here.....?

Regards
Charles

22

Charles_Gibbs:
I am now on the serial monitor getting a 0 or a -18 when I send the line of code through.

Is that correct?

Sorry, I know nothing about Nextion screens. Are you able to show "hello world" with a very simple program?

...R

23

Robin2:
Is that correct?

Um? after putting it through through the atoi, that's what it gives me so I would presume so it takes away the first 2 zero's it would seem.....

if you concur then I'll mark this post as solved, I have posted under Perry Beddingtons post, I'll see if he answers me.

Thanks for your help Robin..

Regards
Charles

24

Charles_Gibbs:
Um? after putting it through through the atoi, that's what it gives me so I would presume so it takes away the first 2 zero's it would seem.....

Is it producing the values that have been sent to the Arduino?

There should be no "UM?" about that - it is, or it isn't. :slight_smile:

...R

25

Hi Robin.

It is producing the values.

Since I put in the atoi line that is how it is being produced, so I presume that that is right...

I have since found that I am able to say AHVal = -AHVal;

Then it swings the numbers positive in the serial monitor.

I now have to get the map function working.

But I now have positive numbers and not negative ones.

It should make life easier.......

thank you for your help.

regards
Charles