On Tue, Dec 8, 2020 at 7:53 AM <ken.stra...@gmail.com> wrote:
I am attempting to produce a Python component which periodically
outputs X/Y/Z/A coordinates via a serial port that is actually a USB
connection.
This is similar to what is required for pendants that display the
current coordinates. Can anyone suggest a tutorial or source code
that could be adapted to my needs?
I have looked at http://linuxcnc.org/docs/html/man/man1/xhc-hb04.1.html
but
I'm hoping for something simpler and a little easier to adapt to Python.
I have made something similar to what you ask between a Raspberry and
an Arduino board with a 16x2 LCD display.
The Python program that runs on the Raspberry is this:
------
import linuxcnc
import serial, time
ser = serial.Serial('/dev/ttyUSB0') # open serial port
data = linuxcnc.stat()
try:
while True:
data.poll()
x=data.actual_position[0]-data.g5x_offset[0]
y=data.actual_position[1]-data.g5x_offset[1]
z=data.actual_position[2]-data.g5x_offset[2]
a=data.actual_position[3]-data.g5x_offset[3]
r0=("X{x:5.2f} Y{y:5.2f}".format(x=x,y=y))
r1=("Z{z:5.2f} A{a:5.2f}".format(z=z,a=a))
ser.write(r0.encode('utf-8')+'%')
ser.write(r1.encode('utf-8')+'%')
time.sleep(.05)
except KeyboardInterrupt:
ser.close()
------
The Arduino program is this:
------
/* ernesto.lova...@unipa.it @ 2020 */
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F, 16, 2);
char riga=0;
void setup() {
Serial.begin(9600);
while (!Serial) ;
Serial.print("Avvio");
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Avvio");
}
void loop() {
while(Serial.available()) {
inputString=Serial.readStringUntil('%');
Serial.println(inputString);
lcd.setCursor(0, riga);
lcd.print(inputString);
riga = 1-riga;
}
}
------
I used the '%' character to signal the newline which was giving me
some trouble.
Let me know if that's what you were looking for.
Ernesto Lo Valvo
--
From: Prof. Ernesto Lo Valvo
Dipartimento di Architettura
Universita' di Palermo
Viale delle Scienze
90128 Palermo (Italy)
Tel: +39-091-23861845 (direct)
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