The chip below that is a level converter to get the microcontroller talking to the RTC chip seen to the right. The battery keeps that clock running when there’s no power from the 5V and 3.3V ...

Real-time clock (RTC) modules are increasingly being designed with ultra-low power modes to extend battery life. But that’s ...

The ESP32 drives the steppers via L298N H-bridge drivers, but it’s hard to say if there’s an RTC chip or if the microcontroller is just getting time via an NTP server. [David] might not be the ...