MCU receiving PT2272 wireless receiving module problem-EEWORLD

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PT2272 wireless receiving module is the most common wireless receiving module, mainly used in anti-theft alarm, battery vehicle, motorcycle remote control alarm.

When the remote control is pressed, PT2272 outputs a high level, but the driving capacity is very small, maybe only a few hundred UA, which is not enough to drive the microcontroller. In the past, a transistor was added to amplify it before the microcontroller could detect it. I am about to make something and I just need to use this module, but I need to add four transistors to drive it so that the microcontroller can detect it, which seems to be troublesome. So I am thinking.

I accidentally thought of the STC 51 microcontroller that can set the IO mode. What if its IO is set to high-impedance mode? The experiment begins... I wrote a program to set the IO port to high-impedance mode, connected PT2272, pressed the remote control, and the microcontroller successfully received the signal. The experiment confirmed that this is OK. Then the next microcontroller detection will not be so complicated. I specially posted it here to share with you. If you are also using this module... You can also try this. I hope it can help you. Thank you everyone. At this moment... My head doesn't hurt so much, I calm down and continue to work on things... Anti-busy baby.

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