I built an initial breadboard for this project. The two push buttons next to the ESP are for programming the chip since I want to easily debug my code as I add the hardware components. The next two buttons emulate the high and low nutrient solution mark for the sump. Pressing the "Sump Low" button starts the pump from the reservoir to refill the sump. This activity is represented by the red LED, indicating the pump is running. Pressing the "Sump High" button simulates the level indicator detecting that the sump is full and stops the reservoir pump and turns off the red LED. The sump pump is activated three times a day for 15 minute intervals to flood the growing tubs with nutrient solution. The command to turn this pump on comes from the Mosquitto MQTT message broker running on a Raspberry Pi and originated by a Node-Red service running on the same PI. Activation of this pump is indicated by the yellow LED.