This is an attempt at reverse-engineering the DJI Ronin SC camera gimbal with the following goals:

  • using the DJI focus motor separately from the gimbal,
  • controlling the gimbal using custom software,
  • using the gimbal on a jib/crane-like setup,
  • fixing the (many) annoyances and limitations of the official DJI app.

This blog post serves both as my personal notepad and as a starting point for anyone else going down the same path in the future (perhaps with a different DJI device). As the work is still in progress, the post will be updated occasionally.

Part 1: Physical connections

Since this is a rather expensive gadget, I’d like to avoid taking it apart as much as possible. Thankfully, the FCC publishes independent test reports of all RF-emitting gadgets sold in the US, including photos of the wiring and PCBs: Since many of the same accessories fit the Ronin S as well, its FCC report is also quite useful: If you see photos of components on a blue mat in this article, I’ve likely clipped them from these.

Battery grip mount

The gimbal is split into two main parts – the battery grip and the gimbal head+control unit. Connecting the two is a set of 6 flat contacts on the grip with corresponding pogo pins on the head unit. Presumably, these carry only power, but I have not bothered confirming this.

Side connectors

The gimbal has two sets of side accessory connectors, this time with 8 flat pads on the head and corresponding pogo pins on the accessories. Detaching them from the body by removing the 4 hex screws holding them in place reveals a conveniently labeled PCB and rather annoyingly tiny internal header.

A few minutes of poking with the smallest multimeter probe I could find reveals the following correspondence:

//TODO: include pinout

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