i have started a project to water house plants with my home and was wondering if someone would be happy to have a look over my circuit and point out any mistakes or give me any ideas for improvements
i have drawn it out on EasyEDA as it was easy to use also attached a screenshot
i haven't yet just wanted someone to sanity check the circuit and make sure I'm not doing something completely wrong before it try and set it up , i think my theory is right but i have had no experience and i have picked components based on information i have read online and some assumptions
next step is to set it up on a breadboard and get it working i think .
i will look at using the 5v rail instead for everything other than the e-ink display
i did have the idea to use the WeMos battery shield on top to manage power and just not bridge the pads for a0 pin and take it off to the analogue input BM
pump specs
DC Voltage: 3-5V
Working current: 190-200mA
and defiantly a good suggestion on the pads and screw terminals
The transistors you are using, 2N3906, are PNP connected as if they were NPN. You need NPN transistors.
pump specs
DC Voltage: 3-5V
Working current: 190-200mA
You have chosen transistors with maximum collector current of 200mA, the motors are right up to that. You also need to consider the stall current, which most likely will be more than that. I'd use an N channel MOSFET with a drain current rating of at least 1A.