Brushed TinyWhoop Tricopter Concept

thingiverse

I got pretty close to completing my project before I realized that my setup wouldn't work. The idea was to have a brushed tricopter powered by a tiny whoop board, which is designed for a 9g micro servo because that's the only one I currently have available; Unfortunately, it's also a 6-volt servo, and almost no brushed quadcopters are 2s. A low-voltage micro servo would work fine and fit right into place, but a low-voltage sub-micro servo would be even better suited for this project, and I've parameterized as much as possible in the Fusion 360 file. Moreover, the only board I can feasibly use for this is brushless, so this idea was all dead in the water from the start. I do have a low-voltage servo on its way to me; if it works with my setup, I'll finish this project, but with brushless motor hookups instead. Bill of materials: 1. 8mm motors 2. 40mm props 3. A brushed flight controller 4. A 9g servo 5. Rubber damping grommets - something like these: https://www.amazon.com/gp/product/B075F7BVHV/ on the right. 6. An all-in-one camera The tail mounts directly into the servo, and the servo screws into the frame using the supplied screws; you can secure the servo to the frame and the tail to the servo with a little super glue for extra security. Don't permanently attach the tail until you've had a chance to get the servo working as the servo has a midpoint; you don't have to get it exactly right on the money, but you want to get close. You might have to resize the motor holes or sand/shave/bore them out a bit - the idea was that they'd be press-fit. To get this working in Betaflight, you'd need to use resource mapping to repurpose a pin to work for the servo. I'm going to attempt to run my low-voltage servo directly off the battery if I can; you might be able to run a servo with 4.8v specs off a 5V pad, but be careful - servos can have large amp spikes. There's something about not remapping a pin with the same timer as the motor pins that you'll need to watch out for as well. More information is available here: https://github.com/betaflight/betaflight/wiki/Servos-&-SERVO_TILT-for-3.1 I still haven't done any of this stuff, so take everything I've said with a grain of salt.