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Functional requirements

• Rotate camera around two axes.
• Wired control of PT(Z), focus, iris, ISO
• Output SDI

Electro mechanical

Quality requirements

• At least 30 Pan-tilt Operation Speeds between 0.08°/s to 60°/s
• Support cameras up to 3kg of size 126.9 mm x 95.6 mm x 316.4 mm (width x height x length)

Implementation

• 2x BLDC + encoders (+ slipring on yaw)
• U-bracket? motor both sides?
• Controller (SimpleBGC/StormBGC?)
• Existing kit
  • BeStableCam HORIZON H4/H6
  • DYS Summer Air/Saga

Todo

• Make mock-up with StormBGC with simple motors + joystick
• Check distance between COG & extremities of body
• Find a way to buy parts separately (no need for imu, batteries, joystick, wireless, ...)

Signaling

Quality requirements

• ‼️ Video delay <100ms
• Response time for rotation commands must be < 20ms (debatable, maybe simulate this)
• Signals must be able to travel 100m
• Support control of 30 units over the same transport medium.
• Documentation of the control protocol for maximum interoperability.

Implementation

• Use PTZ control over second SDI (using BMD SDI ardu shield).
• Use battery grip connector for control & power (plug & play: only connect grip + HDMI).
  • Alternative: Use rPi/VoCore2/other for controlling cam
• Write SW for SimpleBGC or other driver board (use on-board accelero for up/down detection).
  • Alternative: Use SimpleBGC firmware for easy setup & driving of motors

Todo

• Check delay of joystick-MCU-SDI-MCU-motor (BMD SDI shield usable?)
  • Alternatives: use Ethernet or RS485 over XLR
• Check usability of rPi/VoCore2/other vs embedded
• Find pinout of batterygrip (USB available?)
• Check controlling over USB (see RM-VPR1, NW-870, MK-A7IIR)
• Check libgphoto2 with rPi/VoCore2/other for controlling over USB @dev1an
• Find a lens motor for focus/zoom

Topology

In: PowerCon + 2x SDI		In: 12V + SDI + UART/I2C		In: 8V + SDI + UART/I2C
BMD Ardu shield (out: UART/I2C) PSU (out: 12V)	Yaw motor	U-bracket + BGC	Tilt motor + enc	BMD HDMI-SDI (out: HDMI) VoCore2 (out: USB)	a7 III Tele