Driving circuit schematic

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Driving Circuit: the driving circuit shown in Figure 18-12. Driving portion is connected to the microcontroller and the air conditioning operation member of the bridge. Microco

ntroller digital signal level P4. 0-P4.3 port (~ 12 feet foot) and P7. 1-P7.3 port ( ~ foot foot) to the output driver chip can be to control the stepper motor and the relay K4, K5, Kl is energized. Thus realizing the fan, the indoor fan speed, medium speed and compressor open to stop control.

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