Electronic _ Electrical components - WARRExploration/Rover_II GitHub Wiki
Here, all electrical components will be documented over time as we progress.
Microcontroller
As Microcontroller we will use the same throughout the entire system. This will simplify PCB-design and debugging. The exact microcontroller is a STM32F446RET6 we got kindly sponsored by STMicro.
Here the datasheet: https://www.st.com/resource/en/datasheet/stm32f446re.pdf (06.12.2018)
As this micro controllers are delivered in a QFP-package we are using STMicro's NUCLEO boards to test all of our circuits first.
They are available here including schematics and other information: https://www.st.com/en/microcontrollers/stm32f446re.html#design-scroll (06.12.2018)
Emergency switch
We will use the same emergency switch (S100/80) as last year (ERC 2018). It is made to disconnect a dc current with a nominal voltage of 48V safely. It was sponsored by Schaltbau GmbH (https://www.schaltbau-gmbh.com). We are very happy with the build quality and reliability! It is recommended to use an emergency switch of this kind, as AC switches don't reliably disconnect DC power sources!
Here the link to the switch itself: https://www.schaltbau-gmbh.com/en/Products/Contactors/Single-and-double-pole-emergency-switches/S100-80-Series/
Energy Storage
We will use two Batteries with different nominal Voltages. The first one is a 12s 44V 5000mAh LiPo that will deliver current to all motors and other parts eventually harmful to people around the Rover. This Battery will be equipped with an emergency switch (Is discussed in the appropriate section). A Key feature of this battery is the possibility to charge it as two 6s LiPo‘s! This makes charging way easier.
The second LiPo has 6s 22V 3000mAh. It will be used for our processing unit and therefor feature no emergency capability as this could potentially harm Software and Hardware.