There's no question that motorized gimbals do a fabulous job of hiding the bumps and bobbles when you're using an action camera. They're pretty much required equipment for multi-rotor flyers who want to capture decent footage from on high. Recent reviews of the DJI Inspire 1 Mount and the Feiyu-Tech G3 Ultra convinced me that I needed a gimbal for my ground-based video shoots as well.
As I was browsing the selection of handheld gimbals, I ran across the Yuneec Steady Grip. Like the Inspire 1 Mount, the Steady Grip merely provides an alternate method to hold, power, and control a gimbal that would otherwise reside on a multi-rotor. The unique pistol-like form factor of the Steady Grip made me realize that I already had most of the parts that I needed to build my own handheld gimbal mount. So I abandoned the store-bought approach and went D-I-Y.
My prime motivation for this project was the desire to easily swap one of my gimbals between its aerial mount and the handheld mount. Being able to utilize a gimbal I already owned presented a substantial cost savings. Adding a gimbal to the bill of materials for this project would likely make it more expensive than just buying a handheld gimbal system outright.
I chose to use the GB200 2-axis gimbal from my Blade 350QX2 quad. The entire gimbal assembly can easily be removed from its mount on the quad by lifting a lock tab and sliding the base off of its rails. I had already upgraded the gimbal with the proper frame to hold a GoPro Hero 3 camera.
To emulate the style of the Steady Grip, I plundered my stash of old RC systems. Among them are several pistol-grip transmitters that I haven't used in years. I located a well-used Futaba Magnum Sport that looked like it would do the trick. It didn't matter that the electronics of the radio were still in good shape. I really only needed the plastic shell. Finding a new use for one of my squirreled-away "treasures" has certainly done nothing to improve my hoarding tendencies!
I wanted to be able to control the pitch of the gimbal while it is in the hand mount. On the quad, this function is controlled by a channel of the radio. I used a servo driver (also called a "servo tester") to transfer this capability to the hand mount. I'll explain later just how that works.
Different gimbals may require a wide variety of input voltages to operate. I wanted to be sure that I provided the correct voltage for the GB200, but I could not find any specs that defined what it should be. I measured the voltage output at the gimbal power pins on the Blade 350 at around 4.3 volts. With that value in hand, I felt comfortable buying a 5 volt voltage regulator for the hand mount.