Python

Introduction

This page is about programming Robotino using Python. This applies to OS images starting from version 4, because Python makes use of the REST-API server running on Robotino. This also works with Robotino SIM Professional starting from version 1.5.0.

cricle example

import requests 
import sys
import json
import time
import math
import signal

ROBOTINOIP = "192.168.1.180:13080"
#ROBOTINOIP = "192.168.1.223"
PARAMS = {'sid':'example_circle'}
run = True

def signal_handler(sig, frame):
    global run
    print('You pressed Ctrl+C!')
    run = False
    
def set_vel(vel):
    OMNIDRIVE_URL = "http://" + ROBOTINOIP + "/data/omnidrive"
    r = requests.post(url = OMNIDRIVE_URL, params = PARAMS, data = json.dumps(vel) )
    if r.status_code != requests.codes.ok:
        #print("Error: post to %s with params %s failed", OMNIDRIVE_URL, PARAMS)
        raise RuntimeError("Error: post to %s with params %s failed", OMNIDRIVE_URL, PARAMS)
        
def bumper():
    BUMPER_URL = "http://" + ROBOTINOIP + "/data/bumper"
    r = requests.get(url = BUMPER_URL, params = PARAMS)
    if r.status_code == requests.codes.ok:
        data = r.json()
        return data["value"]
    else:
        raise RuntimeError("Error: get from %s with params %s failed", BUMPER_URL, PARAMS)
            
def distances():
    DISTANCES_URL = "http://" + ROBOTINOIP + "/data/distancesensorarray"
    r = requests.get(url = DISTANCES_URL, params = PARAMS)
    if r.status_code == requests.codes.ok:
        data = r.json()
        return data
    else:
        raise RuntimeError("Error: get from %s with params %s failed", DISTANCES_URL, PARAMS)
        
#rotate tuple vec by deg degrees and return the rotated vector as a list
def rotate( vec, deg ):
    rad = 2 * math.pi / 360 * deg;

    out = [0,0];

    out[0] = ( math.cos( rad ) * vec[0] - math.sin( rad ) * vec[1] );
    out[1] = ( math.sin( rad ) * vec[0] + math.cos( rad ) * vec[1] );

    return out;
            
def main():
    signal.signal(signal.SIGINT, signal_handler)
    
    try:
        startVector = (0.2, 0.0);
        a = 0;
        msecsElapsed = 0;
        vec = [0,0,0];
        
        while False == bumper() and True == run:
            dir = rotate( startVector, a );
            a = 360.0 * msecsElapsed / 10000;
            
            vec[0] = dir[0];
            vec[1] = dir[1];
            
            set_vel(vec);

            time.sleep(0.05)
            msecsElapsed += 50;
            
        set_vel([0,0,0])
    
    except Exception as e:
        print(e)
        return 1
    
    return 0

if __name__ == "__main__":
    main()