![]() The electronic design is shown in the following circuit diagram. The following materials are used for the Fish Feeder: See Things The complete system is contained in an IKEA food storage box that is closed with some clamps on the cover.Īfter removing the cover, a power switch is accessible and a USB cable can be connected to the ESP32 for replacing the software with a new revision if needed.Ī blue LED is installed to indicate the status of the Wi-Fi connection with the AP. The 7 mA in deep sleep are probably due to the on-board red LED of the ESP32.Ī number of mechanical parts are 3D printed. During full operation with the stepper motor turning some 320 mA are drawn from the battery. Measurements performed to the operational system show that during Deep sleep there is (still) a power consumption of 7 mA. The driving lines to the stepper motor are switched low after the stepper motor has done its job. For instance, the system is put into a “deep sleep” mode with only the built-in real-time clock (RTC) working. Since the system is powered by a solar panel, provisions have been made to save on battery energy.
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