Possible servo connection for turret

[Gmhgq]

Hi all
Is it possible to connect a 360 deg servo with a 7.1 receiver board for control of turret in a 1/10 3d printed tank( previously set up for open panzer tcb

[tankme]

Sure. I'm not sure how much voltage the Heng Long 7.1 will supply to the servo though. Larger servos are more power hungry so you may have to use a secondary power source to the servo depending on the size of the servo.

[Gmhgq]

Ok my next question is how
CN3 is a 2pin, what is the best way, sorry not the best at electronics

[tankme]

The CN3 connection is a DC motor connection which is why it only has a positive and a negative pin in the connector. A "servo" is a PWM (pulse width modulated) DC motor so it has a positive, negative, and a signal wire. Without getting a signal on the signal wire, a servo will not move.

You have options to do this. Some options would be better than others and some would require some experimentation on your part.

Option #1: Use a geared DC motor on CN3 instead of a servo. *My recommendation*

Option #2: Convert your servo into a DC motor and put it on CN3. In order to do this you would need to convert your "servo" into a straight DC motor. You can't just cut the signal wire off as the servo will not move at that point. In order to convert from servo to DC motor, you would need to open up the servo, remove the circuit board/wiring, solder a positive and a negative wire onto the motor, and then reinstall the servo case. But, for me I would just ask then why wouldn't you just use a geared DC motor to turn the turret and not a servo as in Option #1?

Option #3: Leave your servo as a servo and plug it into CH3 or CH4 (3-pin connectors) on the HL board. You may need to play with the HL setting in their instructions to activate those channels as I'm not sure which combination of setting would yield good results. I say good results as in having the turret functions on one stick and drive functions on the other. It may end up being that the turret and elevation gets broken down onto two separate control sticks. I have a 7.1 in my wheeled MGS and it works out that the steering and motor control are on one stick. Being at work, I couldn't tell you which ports are being used or what settings at the moment.

[Pavel]

2. The option will be better if you do not remove the board, but glue the shaft of the feedback potentiometer at the "0" point with a drop of CA, and disconnect its shaft from the reducer, then your servo drive will turn into a normal reducer with rotation in both directions.
And for clarity, type in YouTube "360 degree servo". There are tons of tips and solutions there!!!!!

[Gmhgq]

So does that mean the connection plug can be replaced with the 2pin to suit CN3

[Pavel]

If the question is for me, then the connector remains on three wires, because the signal gives rotation in different directions. Such modified servo drives are used as winches, I have such a servo that raises and lowers the anchor on the ship, many people make micro-machines based on such a servo drive, installing a wheel on the axle.

[tankme]

So does that mean the connection plug can be replaced with the 2pin to suit CN3

If you modify your servo into a DC motor, you can change the connector to a JST type that will fit the CN3 slot. The servo uses a Dupont connector. I have this kit, but the crimper is quite bad so I normally solder mine tips on. https://www.amazon.com/Qibaok-Crimping- ... hdGY&psc=1