int ps_relay = 2; //This is the pin that drives the relay for the charging power supply int load_relay = 3; //This is the pin that drives the load for discharging the battery int batteryPin = A0; ...

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Assume that you are moving towards a complex microcontroller project bundled with blinkers, beepers, and a display panel. To link a standard 16×2 LCD directly with the microcontroller, for instance ...