I am working on a DIY drone, and I (preferably) need to be able to disconnect my ESCs from the battery via the transmitter (a Raspberry Pi). After looking for solutions for a while, I concluded FET switches are my best bet to automate this. However, I am not certain how to determine the requirements for the switches (I have no engineering knowledge, I am learning on the fly). Considering that the maximum current draw for the motors is 12A, the battery is 11.5V, and the RPI's pins for control are 3.3V and can take a maximum draw of 16mA, are my assumptions correct:
- Switches need to have Vds>11.5V, and Vgs<2.5V
- The draw on the gate can be neglected because it is ~0
Also, what considerations should be made about the S->D current draw? And am I missing other factors?