How to control x and y axis with accelerometer

[anonymous_user_e18764b8]

I am trying to use arduino uno and an accelerometer to control the x and y axis of a flat plane. I have the x axis working but when I try to do the same for the y axis, it uses the same serial for both axes. Is there an easier way to do this?

[phoboz]

Personally, I would set Arduino to output the data in this way:

Serial.print(analogRead(xpin));
Serial.print(",");
Serial.print(analogRead(ypin));
Serial.print(",");
Serial.println(analogRead(zpin));

delay(100);

This should create an output like XXXX,YYYY,ZZZZ

Then create a function to split it into individual values and convert to floats, like so:

Finally, connect the output of your ReadSerial node to this function and you end up with separate float values for each axis in a single go.

[anonymous_user_e18764b8]

Okay now it is able to read each value perfectly! For some reason when the output from the vector is put into the SetWorldRotation, it only reads the one value. I don’t know if this is the right conversion node or not. to alt text

[phoboz]

By default it uses RotationFromXVector for conversion, which is not what you want in this case.

Simplest solutions would be to replace the MakeVector node with MakeRotator or right-click on the New Rotation pin and select Split Struct Pin, like so:

Then connect the float outputs (green wires) into corresponding axes.

For future, if you want to convert Vector to Rotator you can use one of those methods:

[anonymous_user_e18764b8]

Ah okay, I used the make rotator method and it works perfectly. My last problem is with arduino itself but I’m trying to figure out a way to fix it in Unreal. Basically I changed the code a bit to produce the serial as degrees but now each axis will jump from 0 to 35/-35 degrees. Is there any way to fill in the gap of rotation in unreal, or is this just a arduino code problem?

[phoboz]

Not really an Unreal problem, but:

• x_offset is incorrect - you want (min+max)/2 = 508, not 536
• x_range is also incorrect - should be 153
• check y_offset and y_range as well
• use range variables inside constrain functions

Assuming the range -153 to +153 corresponds to -180 deg to +180 deg, you just need to do a simple mapping of values, like so:

x = analogRead(xpin);
y = analogRead(ypin);

int x0 = constrain(x - x_offset, -x_range, x_range);
int y0 = constrain(y - y_offset, -y_range, y_range);

// Set multipliers to map from your values to degrees
float xMulti = 180 / x_range;
float yMulti = 180 / y_range;

int degX = int(x0 * xMulti);
int degY = int(y0 * yMulti);

[anonymous_user_e18764b8]

Amazing! Everything works perfectly! Thank you so much!