Hey. I posted a thread a while back about an automatic cat faucet that I have been designing. I’ve gone through and gotten everything working but want something a little more professional and finished for the board.
Basic idea is to have a weight sensor (HX711 as the amp) that detects a change and opens up a motorized ball valve using a TB6612FNG as the motor driver. I was looking for a little help in checking over the schematic I’ve put together to make sure everything is all set before I go ahead with the board design.
My concerns aside from any others notice are:
Whether Q2 will need a Zener diode and resistor to limit the voltage from gate to source. The gate to source max in the Datasheet for the MOSFET is 12V. Since the circuit will never be powered with more than 12V is it ok to leave this as is? This is going to be a battery powered circuit so I don’t want to add the zener if it is going to waste power unnecessarily.
Are there sufficient bypass caps and adequate values?
Any concerns with analog and digital in the load cell amp? I’ve been trying to read up as much as I can on this and it seems one article contradicts the next on how to approach this.
Any other issues I would love to hear about before moving on.