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I see that in the cf bolt schematic, the STM_SWIO and STM_SWCLK are not connecting to the NRF51822, so how can the RF chip upload the firmware?

Hi, I'd like to know the specific type of X3 16MHz oscillator. It seems to need power, but two terminals are connected to GND.

@leonana69 may you share your pid and thrust base values so I can compare to the crazyflie and make the right decision for my new quad? The thrustBase is 32000 and thrustMin is 20000. For height control PID, the PID_Z_RATE_KP/KI/KD are 7.0/2.0/0.3, the PID_K_KP/KI/KD are 10.0/2.0/1.0. I didn't chan...

The reason for that is that it might be possible to build a very small and powerful quadrotor using the Bolt. Then the latency between the sensor readings and motor output will be more important. The SPI has lower latency and therefore this was chosen. It adds some possible compatibility issues tho...

I wonder is there any reason for changing I2C to SPI DMA way of reading sensors data in cf bolt?

Very nicely done! Did you also get the flow deck to work OK? I think there are some parameters that needs to be changed/tuned to compensate for the different inertia, weight and thrust. Yes, I re-tuned the PID controller, changed the thrustBase in the position_controller_pid.c to match the current ...

These days I've been working on somehow combine these two drones: https://cdn.shopify.com/s/files/1/1285/4651/products/CineBee-75HD-with-RuncamSplitNano_4_-1000x1000_700x700.jpg?v=1579823606 and https://www.bitcraze.io/images/Crazyflie2.0/Crazyflie2.0-585px.JPG . The first is iFlight Cinebee, it's v...

tobias wrote: ↑Fri Jan 31, 2020 8:36 am After checking the datasheet a bit more the operating voltage range is 4.35V to 6.4V, thus it will not regulate the voltage above ~6.4V so It looks like it can not be powered by more then that.
bq24075-vop-range.png

OK, I'd rather using a external 5V LDO instead.