Mount 360 degree rotator with camera using 2 pins (Power line and Gnd)

[dhinesh.ganesan]

I am designing a rotator circuit which consists of a 5v stepper motor and 5v DRV8834 driver IC. The driver IC got 1 pins which is a step to control the motor. The problem/question is that only a two lines come from the camera top section(combined 12Vpower/5V step line and ground. The camera top section runs at 12V. Is that possible to use the same 12V line to toggle as a 5V step pulse as well? The idea is as soon as the bottom section is connected to the top section, the Intelligent circuit should recognize whether the rotator is receiving 12V power or 5V step signal. If it is 12V then the system stays on and shouldn't consume current as well as doesn't harm the motor. When it receives 5V step signal it goes through the 5V buck regulator (only if needed?) and supply the voltage to the motor and turns on the rotator. Is that possible to connect? I have attached the rough block diagram. Could you please help me?

 

[barry]

I'm not quite sure I understand, but you should be able to create a circuit using a voltage comparator that can distinguish between 5V and 12V levels. If the level is above, say 5.5V, the comparator would trip and disable the voltage path to the motor and enable the path to the camera.

 

[c_mitra]

You need to have some additional circuit at the top.

12V power should be regulated to give 5V for the stepper.

The 12V DC power should be combined with a 1-2V HF pulse that will be coupled with another circuit via a capacitor.

Using a remote control IC, you feed the decoded signal to the stepper.

It may look complex but it is rather simple.

 

[dhinesh.ganesan]

Thanks for your help. Could you please add a rough schematic or any diagram which would help me.