ModalAI Forum

Hi @Vinny ,
I have couple questions on FCv2 hardware, thank you!

1. what is the purpose of STM32 UART7 through level shifters (74LVCH2T45)? both VCCA and VCCB are same 3.3V domain?
2. J2 - where is VPP_STM connect to and what is the function?
3. J5 - why there is no level shifter on UART5?
4. J13 - Is that PM monitoring really need for FC? Can I just use a adc pin to monitor battery voltage through the divided resistors?
5. RGB1 LEDs are controlled by GPO PE3/4/5, please confirm which pin for witch color.
   Thanks,
   Daniel

Hi @Vinny,
Please advise the FCv2 MCU stm32h753ii for PCB stackup, how many layers of PCB? Is it need HDI or just normal PCB process?
Thanks!

Hi @Vinny
Yes, I see the pin assignment on the block diagram, but I want to see the circuits of "basic 5V and 3.3V voltage detect circuits and ID settings" seem like those configs are important for PX4.

Can you please tell how many ways that FCv2 can get battery information? is it via I2C3 bus to read the battery information from power module? any other way?

Thanks!
Daniel

Thanks @Vinny , can you please also provide the PX4 detect/Monitor circuits? if possible using that monitor circuit to read the battery level through ADC1/ADC3 instead of can bus?

Hi @Vinny , we have can bus no communication issue, according to J8 - CAN Bus Connector Notes CAN “Silent” pin (STBY) is controlled by STM32 PD15 pin (default pulled-LOW in hardware), can you please provide the STM32 PD15 pin's location or board file for our measurement?

Thanks,
Daniel

Hi @Jacob-Camarillo, thanks for your information about FC V2 but I'd like to see more of peripheral ICs/Modules pins connection and power tree design, can ModalAI please share the schematic with me?

Thanks,
Daniel

Hi there, can you please provide the FC2 schematic and board file? we'd like to measure/hooking CAN bus/UART/PWM etc signals during our development. Thanks.

I have Sentinel buy from order #3376. While we try to fly first time and we found one of propellors power is weaker than others.
We set to manual mode to fly that you can see the drone take off in a sloping position because the front-left propellor power is low. Please refer to attached video.
We try to reassemble the propellor but seems not very work.
Is this a quality issue? Do you have experience on this?

@Andre-Moura Thank You! We fixed our GPS setting problem.

@Andre-Moura We have same issue here but we try to remove -d 7 -b 115200 from /etc/modalai/voxl-px4.config is still not working. Did you modify thr code like this?

Removing the 115200 baud rate is still not see GPS log.