Controll Arduino over serial with Linux shell script / Read Value out

Using Arduino Programming Questions
#1

Hi,

i try to controll an Arduino with serial Connection on Linux. Im also want to read out some Values.
But in the shell Script is somethin wrong, what ist the falture?

#include “U8glib.h” //https://code.google.com/p/u8glib/

#include <OneWire.h>

#include <DallasTemperature.h>

#define ONE_WIRE_BUS 3 //OWB an PIN 3

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);

DeviceAddress sensor1 = { 0x28, 0xFF, 0x19, 0x8B, 0x4C, 0x04, 0x00, 0x3B };

DeviceAddress sensor2 = { 0x28, 0xFF, 0x12, 0x8B, 0x4C, 0x04, 0x00, 0x4B };

U8GLIB_SSD1306_128X64_2X u8g(U8G_I2C_OPT_NONE); //Banggood SSD1306 0.96" OLED I2C http://www.banggood.com/0_96-Inch-White-IIC-I2C-OLED-Display-Module-12864-LED-For-Arduino-p-932606.html

//SDA = Pin A4 ; SCL = PIN A5

double temp1 = 0;

double temp2 = 0;

int led = 13;

void u8g_prepare(void)

{

//u8g.setFont(u8g_font_6x10);

//u8g.setFont(u8g_font_fub42n);

//u8g.setFontRefHeightExtendedText();

//u8g.setDefaultForegroundColor();

//u8g.setFontPosTop();

}

void setup(void)

{

Serial.begin(9600);

pinMode(led, OUTPUT); //PIN 13 (LED) als Ausgang definieren

sensors.begin(); //DallasTemperature sensoren starten

u8g.setRot180(); // Display um 180° grehen, wenn erforderlich

//u8g.setContrast(0x30);

//u8g_prepare();

}

void draw(void)

{

//oben

u8g.setFont(u8g_font_fub17n);

u8g.setPrintPos(0, 20);

u8g.print(temp1);

u8g.setFont(u8g_font_fub17);

u8g.drawStr( 75, 20, “C”);

//unten

u8g.setFont(u8g_font_fub17n);

u8g.setPrintPos(0, 50);

u8g.print(temp2);

u8g.setFont(u8g_font_fub17);

u8g.drawStr( 75, 50, “C”);

}

void serialcontrol()

{
int eingabe = 0;
eingabe = Serial.read(); // seriell einlesen

//Sensor2 bei eingabe 2 ausgeben

if (eingabe == ‘1’ )

{

Serial.print("Temperatatur Sensor1: ");

//Serial.println(sensors.getTempCByIndex(sensor1));
Serial.println(temp1);

}

//Sensor2 bei eingabe 2 ausgeben

if (eingabe == ‘2’ )

{

Serial.print("Temperatatur Sensor2: ");
//Serial.println(sensors.getTempCByIndex(sensor2));
Serial.println(temp2);

}

if (eingabe == ‘3’ ) //LED an 13 einschalten

{
digitalWrite(led, HIGH);
}

if (eingabe == ‘4’ ) //LED an 13 ausschalten

{
digitalWrite(led, LOW);
}

}

void loop(void)

{

sensors.requestTemperatures();

// temp = sensors.getTempCByIndex(0); //Sensor ohne Adressierung

temp1 = sensors.getTempC(sensor1);

temp2 = sensors.getTempC(sensor2);

// picture loop

u8g.firstPage();

do

{

draw();
serialcontrol();

}

while( u8g.nextPage() );

delay(450); //0.45sekunden

}

When i try manually–>

root@debian:/tmp# echo '2' > /dev/ttyACM0
root@debian:/tmp# echo '1' > /dev/ttyACM0

then i get the right answear → 

root@debian:/tmp# cat /dev/ttyACM0
Temperatatur Sensor2: 16.62
Temperatatur Sensor1: 16.69

When i try it automatically with a shell script (with 755 rights). The .txt file is empty.
What make im wrong?

#!/bin/bash

echo '1' > /dev/ttyACM0
cat /dev/ttyACM0 > /tmp/sensor1.txt
sleep60
echo '2' > /dev/ttyACM0
cat /dev/ttyACM0 > /tmp/sensor2.txt
exit

greats
Tobi

#2

How does the redirection know how to finish the file?

#3

KeithRB:
How does the redirection know how to finish the file?

I don´t know how i can too this, my linux skills are not the best

#4

Don't use a script. Use a program that can interact directly with the arduino.

#5

KeithRB:
Don't use a script. Use a program that can interact directly with the arduino.

Thx for the tipp, i use linux as Server without GUI, is there any programm that i can use?
Can i stop the cat prompt after 1-2 seconds?

#6

This demo shows how to interact with an Arduino using Python

...R

#7

Thank you Robin, i will show it.

I found a another nice Solution in C click

With this command i can read 10seconds and save it.

 ./arduino-serial -b 9600 -p /dev/ttyACM0 -d 10000 -r >> sensor.txt

But how can i combine it with the echo?

#8