Key tester

The invention discloses a key tester comprising a key test circuit. The circuit comprises a power supply, a resistor, a buzzer, a light emitting diode and a key. The resistor and the light emitting diode are connected in series with each other and then connected in parallel with the buzzer to form a parallel circuit. One end of the parallel circuit is connected with the power supply, the other endof the parallel circuit is connected with one end of the key, and the other end of the key is grounded. Through the setting, the fingerprint module costs less, has better insulation performance, andhas the characteristic of low power consumption. 本发明公开了种按键测试器，包括按键测试电路，该电路包括电源、电阻、蜂鸣器、发光二极管和按键，所述电阻与发光二极管串联后与蜂鸣器并联后形成并联电路，所述并联电路的端与电源连接，其另端与按键的端连接，按键的另端接地；通过上述设置，使得该指纹模组成本更低，绝缘性更好，同时具备功耗低的特点。