Interfacing via Lua

so. want communicate arduino.

i have arduino ide istalled , if use it, works fine.here sketch:

code: [select]

const int ledpin = 11;      // pin led attached to
 
void setup() {
  // initialize serial communication:
  serial.begin(9600);
  // initialize ledpin output:
  pinmode(ledpin, output);
}
 
void loop() {
  byte brightness;
 
  // check if data has been sent computer:
  if (serial.available()) {
    // read recent byte (which 0 255):
    brightness = (serial.read()-48)*28;
    // set brightness of led:
    analogwrite(ledpin, brightness);
    serial.println(brightness);
  }
}

if start serial monitor , type in "9", 252 , led jups full brightness. , if type "0", led goes off!

this wanted recreate via lua. downloaded rs232 , tried run following:

code: [select]

local rs232 = require "rs232"
 
local e, p = rs232.open('/dev/ttyacm0',{
  baud         = '_9600';
  data_bits    = '_8';
  parity       = 'none';
  stop_bits    = '_1';
  flow_control = 'off';
  rts          = 'on';
})
 
input=io.read()
p:write(input)
print(p:read(1))
p:close()[/code

 but nothing happens. without p.read() part

i use linux centos 7 , arduino uno

please help


if want here, post sketch here. i'm not going site download anything.

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