Added some functionality to the server to allow remote control of the pumps.
Wired up everything and successfully tested the 2 pump systems. It's not pretty, but it works. Also hooked up all the irrigation lines and staked them into the various pots in the dirt. Now only the software and container/camera mount remains. 
Rewired the control circuitry and pump lines, setting everything outside for a test run tomorrow. Using large coffee mugs to weigh down the pump inlet tubing. Soldered some screw terminals to a small breadboard to make removable connections between the Pi and the relays. 
Hooked up camera to Pi zero for garden monitoring. Got the old discord bot control working, though I think I'm going to pivot to a Tailscale VPN to get a less bloated and less precarious setup. I did a preliminary setup connecting a few devices and hosting a simple webpage with a Flask server to get user input and show a photo snapped by the camera. 
Took inventory of last years automated garden pump system. Saved cronjobs and scripts from old system and reflashed a new Pi Zero with Raspbian. Brainstormed some additional functionality and purchased some peripherals online.
Designed force-sensitive resistor (parallel) weight measurement board that signals an output when the force is above some threshold level. 
Designed very simple but likely very useful screw terminal / header pin breakout connector board. 
Designed Pi Zero hat for balcony garden pump control. 
Designed interleaved comb trace board design for both capacitative and resistive moisture detection (03011-005). 
Designed very small capacitative water detection control circuit with an embedded ch32v003 microcontroller for detection, processing, and reporting. This also needs an external capacitor device to make the actual measurements. 
Designed very small resistive water detection control circuit. It needs to be plugged into some expansion board or non-electrolyzable probes. It returns a digital output on a closed circuit. 
Designed alternative to 12V relay circuit using a single N-channel MOSFET (03011-002). This can be used to drive the water pump from a GPIO pin. 
Designed water pump control relay breakout board for balcony garden. This is a nearly 1-1 drop in replacement for what I currently have on a protoboard and used successfully last summer. 
