Tiny Whooping My Dogs!

My dogs love to chase my Tiny Whoop around the house. Several batteries and they are both done for the night. Their obsession has grown to the point where they recognize the sound of one-cell lipo batteries hitting the table and plugging into the charger. If I turn on my DX9 anywhere in the house they come barreling through the hallways to chase their favorite toy!

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What’s this 4k/4k Mode And MultiShot?

If you haven’t tried 4k/4k with multishot yet, or something even faster, DUDE you are missing out big time. Go upgrade your favorite rig right now! I’ll get into details, but generally speaking the improvement in responsiveness is similar to the improvement pilots feel when upgrading from PPM to SBus. Yes, it’s that good! After upgrading, I immediately felt my comfort zone had expanded and that I was willing to go faster and execute exit/save maneuvers much later. Other friends who have recently tried these upgrades have expressed similar opinions. So please, don’t be afraid to upgrade with these new software settings, you will fly better with less latency.

What are these strange new things?

Multishot – a new ESC protocol that is an order of magnitude faster than the original OneShot.

You can download Multishot here, thank you RS2k! https://github.com/rs2k/raceflight/wiki. Once you have dowloaded the .hex files, flash your ESCs through BL Heli Suite and select “custom” or “other” for the firmware file. I’ve flashed this firmware on LittleBee20s, LittlBee30s, and UBad30s.

4k / 4k Mode – The first number describes your flight controller’s looptime. The second number describes refresh rate of the signal that is being sent from the flight controller to your motor speed controllers. It is possible to run both of these values faster than 4k/4k mode, if you’re running a Dodo or similar F3 processor 4k is the limit. If you’re running an F3 flight controller that uses the SPI bus like the Lumenier Lux, then you can run up to 8k. The motor refresh rate is limited by the processor that is on the ESCs. As I write this, the F390 what everyone is moving toward to get the best performance. DYS XM20, XM30, LittleBee30, and UBad30 ESCs all use this chip. The F390 are fast and can support 4k or faster.

LB20s and other ESCs unfortunately use the slower, previous generation F330 processor. I have it’s recommended to run 4k/2k mode on the older F330 ESCs. However, I’m mean to my electronics and tested 4k/4k mode today with a Dodo and LittleBee20s. I flew five or six packs and had no issues. My opinion is, go for it!

To setup 4k/4k mode you simply need to make the following changes:
1. Upgrade to Betaflight 2.6 or later. Get it here (thank you Boris!): https://github.com/borisbstyle/betaflight/releases/
2. Change looptime to 250 in the Cleanflight settings menu
3. Enter CLI, “set use_multishot=on” or “set use_multishot=yes”
4. In CLI type, “set pid_process_denom = 1”

PID Process Denom is a variable that sets your motor refresh rate. The equation that is used is, motor rate = looptime_rate / pid_process_denom. Since you set your looptime to 250 micro seconds (4000 hz), motor rate is also 4k when PID process denom=1.

I hope this article helps you try out the latest stuff!! Here’s my video from a fun session today where I tried out some other new moves with my Speed Addict 210. Please enjoy =)

Drone Pilot Video Feed vs. GoPro Footage

What do drone pilots see while they are racing? It’s a low latency analog video signal. Typically the displays in our goggles are also low resolution and the pilot cameras only have 600 vertical lines of resolution. That’s far less than your 1080 or 4k TV at home! This video compares the HD GoPro footage to the feed that we see while flying. The GoPro is only used to make videos after we’re done with a flight.

This was also the maiden for the ShenDrones Pod Prototype. I decided to try the Kiss FC and Kiss 24A ESCs in this build. Although it was easy to setup and flew well, I prefer Multishot and 4khz mode on Betaflight. The Kiss FC with oneshot42 had more latency between my stick command and the motor’s response. However, if I were to compare the Kiss setup to my old Betaflight rigs with OneShot125, I would definitely go for Kiss. I’ll play more with the Kiss FC to tune rates, but that latency will never go away unless multishot is ported to the Kiss FC…pretty please Felix?