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| KY-003 Hall magnetic sensor module |  |
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| KY-003 is a magnetic switch. If no magnetic field is present, the signal line of the sensor is HIGH (3.5 V). If a magnetic field is presented to the sensor, the signal line goes LOW, at the same time the LED on the sensor lights up. The polarity of the magnetic field is of influence to the switching action. The front side of the sensor needs the opposite polarity as the back of the sensor to switch on. Some rudimentary software available. |
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| KY-024 Hall magnetic sensor module |  |
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| KY-024 Linear Hall magnetic module and a digital interface, built-in 13 LED build a simple circuit to produce a magnetic field warning lamp 13 comes with digital interfaces of the LED, the linear Hall sensor magnetometer access number 3 interface, when linear Hall magnetometer Sensor senses a key signal, LED lights, otherwise off. |
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| KY-035 Hall magnetic sensor module |  |
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| KY-035 is an analogue magnetic field sensor module. The strength of the field is given by an analogue voltage at the signal pin of the module KY-035. The sensor is connected to GND and 5Vdc of the Arduino board. The output voltage is measured by analogue pin A5 on the Arduino board. The example program measures the output voltage of the sensor en presents the measured value in the serial monitor of the Arduino. The led on the board flashes in a speed depending on the strength of the magnetic field. With a small magnet this can be demonstrated. |
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