servo with quadrature encoder with duino board

krolikbest · Joined: 02 Jan 2017 Posts: 112

Hello

it is not strictly to Bascom although code was written in Bascom. I ask because maybe someone had similar issue? Below short description:
Some time ago have bought from China small servo with quadrature encoder on the rear side. Encoder is powered with 5 VDC. When I connected:
- pins (channel A and B) from this encoder to the pins (2,3) of Arduino Uno
- Arduino Uno pin 5v to encoder's Vcc
- Arduino Uno pin GND to encoder's GND
and manually rotate this servomotor my program counts encoder ok. By manually rotating I understand that servo is not connected to the power (30 VDC), so it can be rotated in a hand. By saying ok I mean it counts in left direction and right direction and gives correct values.
The problem starts when I connect power (30VDC) to the servomotor and rotate it with a generated signals setp/dir. Servo rotates ok (left,right dir) but while reading encoder I get chaotic values. It doesn't matter in which direction I rotate the servo. I get in serial monitor chaotic values. Encoder is conneted to the Arduino pins 2 and 3 without capacitors. Maybe should I use some?
When I connected encoder from Lika.com (l-41) or Agilent (previously HP) then I got correct values as well. So reading encoders without powering servomotor is ok. Something is disrupting signals from encoder during powered servomotor. How to avoid it?

servo controller :
https://www.alibaba.com/product-detail/M545-2-phase-Stepper-motor-driver_1713657055.html

Maybe someone had something similar?

Regards,
Martin

krolikbest · Joined: 02 Jan 2017 Posts: 112

Thread to close. Simply have changed servo controller to dedicated one and problems disappeared.