People are increasingly dependent on intelligent electronic products. However, the vast majority of these intelligent electronic devices are highly dependent on external power supply. If there is no continuous power supply to the equipment for some unknown reasons, the equipment will not be able to work properly, or even will bring us some serious unpredictable consequences, which poses a new challenge to the endurance of electronic products. Here we report a smart door handle that can efficiently collect and utilize ambient energy to power itself. A Triboelectric Nanogenerator(TENG) is embedded in the door. When rotating the door handle, TENG can convert the mechanical energy to about 0.023W of electricity. At the same time, the internal circuit will send a single to identify the action of opening the door, and then the wireless receiver will make appropriate responses after receiving the signal. In this work, we designed a wireless transmission circuit to ensure that the transmitter and receiver can communicate in real time. Because TENG output power can't directly drive the load, we have designed two power management circuits to manage and optimize the output performance of TENG. The output characteristics of the two circuits were analyzed and compared respectively. Both methods can convert the original power supply to an electrical signal of approximately 5 V and a current of 3 mA, but the use of LTC3330 after the conversion of the voltage signal is more stable.