Lua serial [SOLVED]

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whiteland92
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Lua serial [SOLVED]

Post by whiteland92 » Fri Nov 04, 2016 9:14 pm

i got this code to turn some leds on a arduino.

Code: Select all

local file = "com3";
local serial = assert(io.open(file,"w"))
serial:write("0,25,255,60,1000,false")
serial:flush()
serial.close()
The problem i have is that when the arduino first turns on it doesn't receive it, at least the data in led doesn't blink on the arduino..
what i do is use a c# program to send a string to the arduino, after i've done that the lua code work perfectly fine.
Anyone here that can give me a reason why? or a potential hot fix?

It's almost like the arduino doesnt know it should receive the data.

arduino code. "still learning, gimme some slack:P"

Code: Select all

int ledR = 9;
int ledG = 10;
int ledB = 11;
 
void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ;
  }
  pinMode(ledR, OUTPUT);
  pinMode(ledG, OUTPUT);
  pinMode(ledB, OUTPUT);
}
 
void someFuction(int led_red ,int led_green ,int led_blue, int hz, int duration, String fade)
{
int loops = 0;
Serial.println(fade);
  if (fade== "false") {
    while((1000/hz)*loops < duration)
    {
      analogWrite(ledR, led_red);
      analogWrite(ledG, led_green);
      analogWrite(ledB, led_blue);
      delay( 500 / hz );
      analogWrite(ledR, 0);
      analogWrite(ledG, 0);
      analogWrite(ledB, 0);
      delay( 500 / hz );
      ++loops;
    }
  }
  
  if (fade== "true") {
    while(hz > loops)
    {
      for (int i = 0; i < 255; i++) {
        bool sleep = false;
        if (i < led_red) {analogWrite(ledR, i);   sleep = true;}
        if (i < led_green) {analogWrite(ledG, i); sleep = true;}
        if (i < led_blue) {analogWrite(ledB, i);  sleep = true;}
        if (sleep) {delay(4);}
      }
      delay( duration - 1000 );
      for (int i = 255; i > 0; i--) {
        bool sleep = false;
        if (i < led_red) {analogWrite(ledR, i);   sleep = true;}
        if (i < led_green) {analogWrite(ledG, i); sleep = true;}
        if (i < led_blue) {analogWrite(ledB, i);  sleep = true;}
        if (sleep) {delay(4);}
      }
      ++loops;
    }
    analogWrite(ledR, 0);
    analogWrite(ledG, 0);
    analogWrite(ledB, 0);
  }
}
 
void loop()
{
    String comMSG = Serial.readString();
 // 1 = red, 2 = greem, 3 = blue, 4 = hz, 5 = duration,
    int CommaIndexOne = comMSG.indexOf(',');
    int commaIndexTwo = comMSG.indexOf(',', CommaIndexOne +1);
    int commaIndexThree = comMSG.indexOf(',', commaIndexTwo +1);
    int commaIndexFour = comMSG.indexOf(',', commaIndexThree +1);
    int CommaIndexFive = comMSG.indexOf(',', commaIndexFour +1);
    int CommaIndexSix = comMSG.indexOf(',', CommaIndexFive +1);
    
    String led_red = comMSG.substring   (0, CommaIndexOne);
    String led_green = comMSG.substring (CommaIndexOne +1, commaIndexTwo);
    String led_blue = comMSG.substring  (commaIndexTwo +1, commaIndexThree);
    
    String hz = comMSG.substring(commaIndexThree +1, commaIndexFour);
    String duration = comMSG.substring(commaIndexFour +1, CommaIndexFive);
    String fade= comMSG.substring(CommaIndexFive +1);
   
    if (hz.toInt() > 0 and duration.toInt() > 0) {
      someFuction(led_red.toInt() ,led_green.toInt() ,led_blue.toInt() ,hz.toInt() ,duration.toInt(), fade);
    }
}
Last edited by whiteland92 on Fri Nov 04, 2016 10:22 pm, edited 2 times in total.

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bartbes
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Re: Lua serial

Post by bartbes » Fri Nov 04, 2016 9:30 pm

Presumably you need to configure the com port, on windows' side. The C# program probably sets the baud rate, byte width, etc, and those settings remain as long as the com port exists, which is probably until you unplug the arduino.

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whiteland92
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Joined: Fri Jul 04, 2014 1:30 am

Re: Lua serial

Post by whiteland92 » Fri Nov 04, 2016 10:15 pm

Fixed.
added this line of code

Code: Select all

os.execute("powershell $port= new-Object System.IO.Ports.SerialPort COM4,9600,None,8,one;$port.open();$port.close();")
working serial, windows only

Code: Select all

local port = "com4";
local baud = 9600

os.execute("powershell $port= new-Object System.IO.Ports.SerialPort "..port..","..baud..",None,8,one;$port.open();$port.close();")

local serial = io.open(port,"w")
serial:write("0,5,255,2,1000,true")
serial:flush()
serial:close())
i know i know. it's bodgy
Last edited by whiteland92 on Sat Nov 05, 2016 12:23 am, edited 1 time in total.

MachineCode
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Posts: 70
Joined: Fri Jun 20, 2014 1:33 pm

Re: Lua serial [SOLVED]

Post by MachineCode » Fri Nov 04, 2016 11:23 pm

I haven't tried on windows, but lua-periphery.Serial seems to work very well. It is on luarocks and easy to install. In fact, it installs on Raspberry Pi without any dramas and I was able to talk to a serial device connected to a RPi via VNC using my linux machine. It's just a wrapper, but it makes life easier.

sudo luarocks install lua-periphery

local periphery = require('periphery')
local Serial = periphery.Serial

https://github.com/vsergeev/lua-periphe ... /serial.md

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TerryLewis
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Posts: 3
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Re: Lua serial [SOLVED]

Post by TerryLewis » Fri May 24, 2019 10:30 am

I haven't tried on windows, but lua-periphery.Serial seems to work very well. It is on luarocks and easy to install. In fact, it installs on Raspberry Pi without any dramas and I was able to talk to a serial device connected to a RPi via VNC using my linux machine. It's just a wrapper, but it makes life easier.

sudo luarocks install lua-periphery

local periphery = require('periphery')
local Serial = periphery.Serial

http://github.com/vsergeev/lua-periphery/docs/serial/hireessaywriter/master.md

Hello,
Does the older rpi-gpio code support Raspberry Pi 3 or 2? It seems that lua-periphery is the only GPIO library for Lua that can be maintained remotely. I learned Python on Pi first, now planning to jump to Lua on NodeMCU.

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