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How Can I Use Accelerometer From Iphone And App Interface To Steer My Robot

How can I use accelerometer from iPhone and app interface to steer my robot? I'd like to tilt my Iphone and drive my robot left, right, forward and backwards. I would like it to use the amount of tilt to produce the amount of speed. Where do I find the variable for the amount of tilt the iPhone produces?


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PRO
Synthiam
#9  

Oh that's a neat idea. The http server custom has a button where you can specify a variable. So getting the accelerometer data you could assign it to a variable easily.

@Athena, we want to get the accelerometer data and set it as a global variable in ARC using the http server (custom) robot skill. The http server exposes tags and scripts to send data to arc. The one we want to use accepts ezscript, so we need to set the accelerometer value to a variable.

Here is a custom script button: <input type='button' onclick="makeRequest('/script.cmd?code=$AccelX=" + AccelX + " value="Press Me" name="9526cf06e0a74c40a53ee4a6d5fa273f" style='font-size: 20px; background-color: #7700ff; color: #ffffff;' >

Rather than the say() for the code, we want to send the accelerometer's X value to the /script.cmd adn set the $AccelX variable in ARC.

PRO
Canada
#10  

To set the accelerometer's X value as a global variable in ARC using the HTTP Server (Custom) robot skill, you can modify the custom script button to send the accelerometer data to the /script.cmd endpoint. Here's how you can achieve this:

  1. Modify the HTML Button: You'll need to modify the HTML button in your custom HTTP server page to capture the accelerometer data and send it to ARC. You can use JavaScript to get the accelerometer data from the phone and then construct an AJAX request to send it to the /script.cmd endpoint.

  2. JavaScript to Capture Accelerometer Data: Use the DeviceMotionEvent API in JavaScript to access the accelerometer data on the phone. Here's an example of how you might capture the X value of the accelerometer:

if (window.DeviceMotionEvent) {
  window.addEventListener('devicemotion', function(event) {
    var accelX = event.accelerationIncludingGravity.x;
    // Send accelX to ARC using AJAX
  });
}
  1. Send Data to ARC: Once you have the accelerometer's X value, you can send it to ARC by making an AJAX request to the /script.cmd endpoint with the appropriate EZ-Script command to set the $AccelX variable. Here's an example of how you might do this:
function sendAccelDataToARC(accelX) {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      // Handle response if needed
    }
  };
  var ezScriptCommand = "setVar($AccelX, " + accelX + ")";
  xhttp.open("GET", "/script.cmd?script=" + encodeURIComponent(ezScriptCommand), true);
  xhttp.send();
}
  1. HTML Button with OnClick Event: Modify the HTML button to call the sendAccelDataToARC function when clicked, passing the accelerometer's X value:
<button onclick="sendAccelDataToARC(accelX)">Send Accel Data to ARC</button>
  1. Complete Integration: Ensure that your custom HTML page with the modified button is placed in the HTTP Server Root folder as specified by the HTTP Server (Custom) robot skill. When you click the button on your phone, it should send the accelerometer's X value to ARC, setting the $AccelX variable.

Remember to test this setup thoroughly to ensure that the accelerometer data is being captured and sent correctly to ARC. You may need to adjust the JavaScript code based on the specific requirements of your project and the capabilities of the phone's browser.


I am a customer support GPT-powered AI and still learning. If you have doubts about my response, please use the support documentation to verify my answer.
PRO
Synthiam
#11  

@Athena, now can we map the accelerometer output to a value between 1 - 180 before it's sent?

PRO
Canada
#12  

To map the accelerometer output to a value between 1 and 180 before sending it to ARC, you can use a mapping function in your JavaScript code. The mapping function will take the accelerometer's X value, which typically ranges from -1 to 1 (or -10 to 10 depending on the device and browser), and convert it to a value within the desired servo range.

Here's an example of how you might implement the mapping function and integrate it with the code to send the accelerometer data to ARC:

// Function to map a value from one range to another
function map(value, inMin, inMax, outMin, outMax) {
  return (value - inMin) * (outMax - outMin) / (inMax - inMin) + outMin;
}

// Function to send accelerometer data to ARC
function sendAccelDataToARC(accelX) {
  // Map the accelerometer's X value to the servo range (1-180)
  var servoValue = map(accelX, -10, 10, 1, 180);
  servoValue = Math.max(1, Math.min(180, Math.round(servoValue))); // Clamp and round the value

  // Construct the  EZ-Script command to set the $AccelX variable
  var ezScriptCommand = "setVar($AccelX, " + servoValue + ")";

  // Send the command to ARC using AJAX
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      // Handle response if needed
    }
  };
  xhttp.open("GET", "/script.cmd?script=" + encodeURIComponent(ezScriptCommand), true);
  xhttp.send();
}

// Event listener for device motion
if (window.DeviceMotionEvent) {
  window.addEventListener("devicemotion", function(event) {
    var accelX = event.accelerationIncludingGravity.x;
    sendAccelDataToARC(accelX); // Send mapped value to ARC
  });
}

In this example, the map function takes the accelerometer's X value and maps it from its original range (-10 to 10) to the servo range (1 to 180). The Math.max and Math.min functions are used to clamp the value within the 1-180 range, and Math.round is used to round the value to the nearest integer.

The sendAccelDataToARC function now calls the map function to convert the accelerometer value before constructing the EZ-Script command.

Make sure to adjust the input range in the map function according to the actual range of accelerometer values provided by your device. The output range is already set to 1-180 for the servo.


I am a customer support GPT-powered AI and still learning. If you have doubts about my response, please use the support documentation to verify my answer.