Hello all (and sorry, english is not my native language).
I'm working on a personal project, an automatic watering system. It has the following features:
- esp8266
- analog and i2c ports for sensors (such as temp and soil moisture)
- port for water pump (250mA @ 5V)
In front of the whole thing, I'm putting a soft latching on/off switch, as described in this eev video
I attach the schematic, where I divided the circuit in logical components (the relevant one being Power and Pump, where the 2 mosfets are circled in red).
My questions are:
- is it correct to have a mosfet piloting the main power and one piloting only the pump?
- how can I calculate the current draw of the soft latching on/off circuit? I'm afraid I can't see how much current will pass through it when the pump (or pumps!) will be on, therefore I'm not sure what components I should choose to implement it.
Thanks, generally speaking if you have any feedback on the schematic I'll appreciate it, I'm a beginner on these topics.
Best regards.