What are the core hardware design elements for a standalone air conditioner thermostat PCBA? (e.g., core component selection, circuit topology, power supply design, etc.)

　　What parameters should be considered when selecting the MCU for a thermostat PCBA? (e.g., computing speed, power consumption, interface compatibility, and temperature control algorithm compatibility)

　　What anti-interference measures should be considered in the circuit design of temperature sensors (e.g., NTC, PT100) in a standalone air conditioner thermostat PCBA?

　　What are the key differences in software logic design for PCBAs that support multi-mode temperature control (cooling/heating/air supply)?

　　If "remote control via mobile app" is required, which communication modules (e.g., WiFi, Bluetooth, ZigBee) should be integrated into the standalone air conditioner thermostat PCBA? What compatibility issues should be avoided in the circuit design?

　　How should the power module design of a standalone air conditioner thermostat PCBA adapt to voltage specifications in different regions (e.g., 110V/220V)? Is overvoltage/overcurrent protection circuitry required?