So I have an Arduino UNO with 4 AA batteries supplying it 6V into the Vin pin, and another power supply which is a Mangoo brand NiMH 7.2V 6 Cells 1.800mAh for the Servo. I have attached the servo to a door knob so that it spins it and opens the door.
The problem is that, from the intended 30 degrees of angles of spin that it has to achieve, it apparently stalls and goes back to the stationary position at about 20/15 degrees. This seems to be the servo/power supply not having enough strength (It does retry to spin again 2/3 times in a quick succession). Now to point something: I remember using the 4 AA batteries with a servo stripped out of it’s control board (Only using the DC motor, no PWM no nothing) and it worked! So it’s very odd that it doesn’t work with an even better battery. It is worth noting anyways, that the other servo (basically a DC motor by then, not really a servo) had all of it’s gear teeth grinded and rendered useless after opening the door 3 or 4 times. I don’t know if it was because the knob is too hard or something else, but it might have been that.
The matter is, I saw a tutorial where some other people achieved opening the door knob. Maybe their knob was a lot easier to spin? They were using a 995 servo instead of a 996, maybe the 995 is much stronger?
Kind regards, Joaquin.