DIY Arduino Helicopter Collective Joystick Control -- Episode 440

Very nice I just ordered all that I need, but for elevation I will try another thing...

Why not use the Hall effect sensor for elevation instead of a big gear ?

I think is more precise, and less mechanical...

It's just the route I took, Initial idea was to go with a timing belt for more precision, but... space.

What hall effect sensor did you go with?

-Kaleb

That looks great Philippe! Well done, I love the hall effect update!

Is it performing well for you?

-Kaleb

Work very well :-)

I will send one part of code about hall sensor when I come back from my holidays ;-)

Here the part my code for SS495a

[code]

void Update_SS495a()

{

    SS495a_ReadValue = analogRead(SS495a);

    static int16_t SS495a_ReadValue_Pre = 512;

    static const uint8_t SS495a_Filter = 15;

    static int16_t SS495a_Value_Min = 1023;

    static int16_t SS495a_Value_Max = 0;

    const int16_t Middle        = 503;    // Find without magnet

    const int16_t DeadZone_Up   = 40;     // For mechanic exercice

    const int16_t DeadZone_Down = 40;     // For mechanic exercice

    int32_t SS495a_Value_Up;

    int32_t SS495a_Value_Down;

    static float SS495a_Step_Up = 1;

    static float SS495a_Step_Down = 1;

    static float SS495a_Value_Up_float;

    static float SS495a_Value_Down_float;

    static int16_t SS495a_ToSend;

    static int16_t SS495a_ToSend_Pre = -1;

    // Auto Calibration after Power, Move Up and down to take Max and Min after Power On ( Plug USB )

    if (SS495a_Value_Min > SS495a_ReadValue)

    {

        SS495a_Value_Min = SS495a_ReadValue;

        SS495a_Step_Down = 512.0 / (float)(Middle - (SS495a_Value_Min + DeadZone_Down));

    }

    if (SS495a_Value_Max < SS495a_ReadValue)

    {

        SS495a_Value_Max = SS495a_ReadValue;

        SS495a_Step_Up = 512.0 / (float)((SS495a_Value_Max - DeadZone_Up) - Middle);

    }

    bool IsUp = SS495a_ReadValue > Middle;

    if (IsUp)

    {

        SS495a_Value_Up = SS495a_ReadValue - Middle;

        SS495a_Value_Down = 0;

    }

    else

    {

        SS495a_Value_Down = Middle - SS495a_ReadValue;

        SS495a_Value_Up = 0;

    }

    if ( SS495a_ReadValue  > SS495a_ReadValue_Pre + SS495a_Filter | SS495a_ReadValue  < SS495a_ReadValue_Pre - SS495a_Filter)

    {

        SS495a_Value_Up_float = (float)SS495a_Value_Up;

        SS495a_Value_Down_float = (float)SS495a_Value_Down ;

        SS495a_ToSend = (-(SS495a_Value_Down_float * SS495a_Step_Down) + (SS495a_Value_Up_float * SS495a_Step_Up)) + 512;

        if (SS495a_ToSend > 1023)

            SS495a_ToSend = 1023;

        if (SS495a_ToSend < 0)

            SS495a_ToSend = 0;

        if (SS495a_ToSend_Pre != SS495a_ToSend) // Send Only if different value

        {

            Joystick.setRxAxis(SS495a_ToSend);

            SS495a_ToSend_Pre = SS495a_ToSend;

        }

        SS495a_ReadValue_Pre = SS495a_ReadValue;

    }

}

[/code]

@Webmaster : The Balise [code][/code] don't work Maybe it's a good idea to activate

I will try it to with the hall effect sensor it seem better by design and avoid those pot , can you shar eyour code/ print for the 2 magnet piece and sensor holder (I see you user a lot of glue

The ( hot) glue is only to fix wires and the SS495a...

You can find the code for double magnet below this post.

If you want my STL of magnets support send me your email

That is awsome Philippe, thanks. I am low on cash for now but in a couple of months I will be beginning to buy parts, (for now i am just doing the pricing). If during the construction phase i get stuck I hope is ok to give you a shout out with a question or two jejejeje. Thanks again!

Hi Philippe - can you advise on the magnet sizes I should use? (first time using a hall sensor like this). I thought the potentiometer I had was having a short enough rotation but not in reality

I use square magnet 5x5x5. 

I make this choice because many round magnets are not polarised correctly, and too much sellers send bads magnets

NB: now I use AS5048a it's more precise than SS495a, of course it's working now in SPI interface, not in analog.

Thanks, benaim, I will go for the bigger square magnets. Did you have to play with magnet distance a lot to get the full range from 45 degrees of rotation? Maybe I should make my mount adjustable instead of hard 45. Interesting you moved to AS5048a, I'm on a Pro micro (planning to fly a quadcopter) and the SPI pins are not used so I could try that as well (will check the datasheet and order one to experiment with as well). Thanks for the info!! Great project KalebTheMaker

I can see on your second picture, the distance is good for AS5048a but for SS495a is not the good way, SS495a mesure the distance, not angle like AS5048a

I can see on your second picture, the distance is good for AS5048a but for SS495a is not the good way, SS495a mesure the distance, not angle like AS5048a

Thanks, benaim I see now the AS5048a is popular for brushless gimbal position. Many PCBs like this I could use in place of the one I have with the potentiometer now. Will pause on the linear sensor and look into this further. Seems like a better solution! Much appreciate the info!!

I might try the AS5600 - lots of cheap kits with magnets and examples of it working on youtube.

https://www.ebay.com/itm/AS5600-Magnetic-Encoder-Magnetic-Induction-Angle-Measurement-Sensor-IIC-Module/164243118854?_tr…

Yes I use this board (https://m.fr.aliexpress.com/item/1005001622340192.html) in SPI mode, not analog...

In SPI is very accurate, in particular with low angles, for us only 45° maybe less.

Don't forget, you need 4 pins for SPI ( SCLK / MISO /MOSI) but one more for control each SPI device, same if you have only one...

I'm now on my smartphone, tomorrow, when I will be on my computer, I will send, here, the link of library that I use.

Ah, I will look at the lib when you get a chance to post it. No rush will be a while before I get a sensor board from China. I was planning to be lazy and try the analog mode of 5600, but first setting its range with i2c so it will have a full 0-5v from whatever rotation it can sense (I got the idea from this demo video from AMS) If that works I don't have to rewrite my existing code Did you bother with trying this or just went straight to reading the angle over SPI?

The Lib SPI for AS5048a is here : https://github.com/eborghi10/AS5048A 

I to read the angle over SPI, it's more accurate

Phillipe,

Do you have an electrical schematic of the configuration you've used with the AS5048a that you could share?