PC to USB TTL to Max485 to Arduino
lazarus / 38-Networking and Web Programming

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microguy · 2020-12-11 03:54

I finally got the PC to USB TTL to Max485 to Arduino working now. But
they are very slow to run it. I have 12 buttons. (six for off and six
for on) with 6 LEDs on Arduino. Is there a way we can make this
faster?  When I click the first button and the first LEDs come on. But
I can't click the second button till the first LEDs finish light on
then I can click the second one. Here is my code for Lazarus.

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TForm1.Button2Click(Sender: TObject);begin  ser.SendString('2'); //
button 2 should have 'on' hereend; procedure
TForm1.Button3Click(Sender: TObject);begin  ser.SendString('3'); //
button 3 should have 'off' hereend; procedure
TForm1.Button4Click(Sender: TObject);begin  ser.SendString('4'); //
button 4 should have 'on' hereend; procedure
TForm1.Button5Click(Sender: TObject);begin  ser.SendString('5'); //
button 5 should have 'off' hereend; procedure
TForm1.Button6Click(Sender: TObject);begin  ser.SendString('6'); //
button 4 should have 'on' hereend;
Code for Arduino

Code: C  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i int RE_DE =
2; void setup(){  pinMode(13, OUTPUT);  pinMode(3, OUTPUT); 
pinMode(4, OUTPUT);  pinMode(5,OUTPUT);  pinMode(6, OUTPUT), 
pinMode(7, OUTPUT); // Put Max485 in transmit mode so that Arduino can
recieve message  pinMode(RE_DE, OUTPUT);  digitalWrite(RE_DE, LOW); //
Start up serial connection  Serial.begin(9600);}void loop(){  if
(Serial.available())    {    int state = Serial.parseInt();    if
(state == 1)      {      digitalWrite(13, LOW);     
Serial.println("Command completed LED 13 turned OFF");      }    if
(state == 2)      {       digitalWrite(13, HIGH);     
Serial.println("Command completed LED 13 turned ON");      }    if
(state == 3)      {      digitalWrite(3, LOW);     
Serial.println("Command completed LED 3 turned OFF");      }    if
(state == 4)      {      digitalWrite(3, HIGH);     
Serial.println("Command completed LED 3 turned ON");      }    if
(state == 5)      {      digitalWrite(4, LOW);     
Serial.println("Command completed LED 4 turned OFF");      }    if
(state == 6)      {      digitalWrite(4, HIGH);     
Serial.println("Command completed LED 4 turned ON");      }    if
(state == 7)      {      digitalWrite(5, LOW);     
Serial.println("Command completed LED 5 turned OFF");      }    if
(state == 8)      {      digitalWrite(5, HIGH);     
Serial.println("Command completed LED 5 turned ON");      }    if
(state == 9)      {      digitalWrite(6, LOW);     
Serial.println("Command completed LED 6 turned OFF");      }    if
(state == 10)      {      digitalWrite(6, HIGH);     
Serial.println("Command completed LED 6 turned ON");      }    if
(state == 11)      {      digitalWrite(7, LOW);     
Serial.println("Command completed LED 7 turned OFF");      }    if
(state == 12)      {      digitalWrite(7, HIGH);     
Serial.println("Command completed LED 7 turned ON");      }    }}
Hope someone can help me to make this faster. I did change the speed
from 9600 to 28800. It makes no difference. I want to fix this first
before I can add servos and IR sensor on it. Also, I am not sure how
to add the second and third Ardunio. How do we address each? I do know
how to add wires to it.  Can someone give me idea on this?

[Edited to add code tags - please see Using the Forums.]

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bd4kc · 2020-12-11 05:45

Before Serial.println, whether to set up a control RS485
receiving/send control PIN？


digitalWrite(RE_DE, HIGH);
Serial.println("Command completed LED 13 turned OFF");
digitalWrite(RE_DE, LOW);

I don't know much about arduino, I just know a little bit about AVR
MCUs.

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bd4kc · 2020-12-11 05:49

Code: C  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i void
loop(){  if (Serial.available())    {    int state =
Serial.parseInt();    if (state == 1)      {state =0;     
digitalWrite(13, LOW);      Serial.println("Command completed LED 13
turned OFF");       }    if (state == 2)      {state =0;     
digitalWrite(13, HIGH);      Serial.println("Command completed LED 13
turned ON");      }    if (state == 3)      {state =0;     
digitalWrite(3, LOW);      Serial.println("Command completed LED 3
turned OFF");      }    if (state == 4)      {state =0;     
digitalWrite(3, HIGH);      Serial.println("Command completed LED 3
turned ON");      }    if (state == 5)      {state =0;     
digitalWrite(4, LOW);      Serial.println("Command completed LED 4
turned OFF");      }    if (state == 6)      {state =0;     
digitalWrite(4, HIGH);      Serial.println("Command completed LED 4
turned ON");      }    if (state == 7)      {state =0;     
digitalWrite(5, LOW);      Serial.println("Command completed LED 5
turned OFF");      }    if (state == 8)      {state =0;     
digitalWrite(5, HIGH);      Serial.println("Command completed LED 5
turned ON");      }    if (state == 9)      {state =0;     
digitalWrite(6, LOW);      Serial.println("Command completed LED 6
turned OFF");      }    if (state == 10)      {state =0;     
digitalWrite(6, HIGH);      Serial.println("Command completed LED 6
turned ON");      }    if (state == 11)      {state =0;     
digitalWrite(7, LOW);      Serial.println("Command completed LED 7
turned OFF");      }    if (state == 12)      {state =0;     
digitalWrite(7, HIGH);      Serial.println("Command completed LED 7
turned ON");      }    }

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bd4kc · 2020-12-11 06:28

Or

Code: C  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i      
digitalWrite(7, LOW);      Serial.println("Command completed LED 7
turned OFF");      }    if (state == 12)      {       digitalWrite(7,
HIGH);      Serial.println("Command completed LED 7 turned ON");     
}state =0;    }

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Laksen · 2020-12-11 11:52

It's serial.parseInt that waits until either a non digit char is read
or a timeout

Just try using Ser.SendString('2'+#13#10); instead and it should be
blazing fast

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microguy · 2020-12-11 19:14

Laksen,

Can you explain a little more?  Where do we put
Ser.SendString('2'+#13#10);

Should we change serial.parseInt to something else?

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Laksen · 2020-12-11 19:37

In the pascal program. Instead of ser.SendString('2');

And the same for the others

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microguy · 2020-12-11 21:37

Got it working fast.  Many thanks.  Can you tell me what is #13 and
#10?   Also, do you know how I can send the second and third Arduino?

Also, I need to figure out how to use IR sensors and send data to
Lazarus. I was thinking to use Tshape with different colors for each
IR Sensors. Also, I would like to use several servos and use the
Control Bar from Lazarus to control Servos.

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trev · 2020-12-11 21:55

Quote from: microguy on December 11, 2020, 10:37:36 pmCan you tell me
what is #13 and #10? 
Carriage return + Line feed !

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microguy · 2020-12-13 03:08

Can someone help me how to write the code for second and third
Arduino? Also servos? I Want to know two buttons which one for left
and one for right or one for up and one for down servos.

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microguy · 2021-02-06 20:56

I got the servos working now with PCS9685. But I still could not
figure out how to get a second or third Arduino working. I understand
we need to put the address on each Arduino. But still need help with
it.

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MarkMLl · 2021-02-07 10:27

You need to read up on multidrop communications. This sort of thing
used to be used very heavily by commercial (i.e. mainframe etc.) data
communications and is still used heavily in industry, although there
is a regrettable tendency these days to stick Ethernet in everything
and hope it works.

Apart from that, you're the one writing the Arduino code, you're the
one writing the PC code, and unless you use a library at both ends
which is guaranteed to implement the same protocol you're the one
handling overall system design including the bytes that go backwards
and forwards on the RS485 connection.

Hence, I'm very sorry but you're in charge and it's your problem.

MarkMLl

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dseligo · 2021-02-07 12:36

Quote from: microguy on February 06, 2021, 09:56:49 pmI got the servos
working now with PCS9685. But I still could not figure out how to get
a second or third Arduino working. I understand we need to put the
address on each Arduino. But still need help with it.
How are they all connected together?
Do all Arduino's receive same data?

If all receive same data then you could send something like this:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
ser.SendString('A2'); // button 2 on "A" Arduinoser.SendString('B2');
// button 2 on "B" Arduinoser.SendString('C2'); // button 2 on "C"
Arduino
or
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i
ser.SendString('12'); // button 2 on "1st"
Arduinoser.SendString('22'); // button 2 on "2nd"
Arduinoser.SendString('32'); // button 2 on "3rd" Arduino
And you have to parse results in Arduino. Example bellow is if you
address them with numbers. If you address them with letters, you'll
have to extract letter first and check if it belong to current
Arduino.
First Arduino:
Code: C  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i     int
state = Serial.parseInt();...    if (state == 12)      {     
digitalWrite(13, HIGH);      Serial.println("Command completed LED 13
turned ON");      } 
Second Arduino:
Code: C  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i     int
state = Serial.parseInt();...    if (state == 22)      {     
digitalWrite(13, HIGH);      Serial.println("Command completed LED 13
turned ON");      } 
And so on.