Multifunctional infrared module
First Claim
1. A multifunctional infrared (IR) module comprising:
- an IR light-emitting diode (LED) having an anode and a cathode;
a first resistor having a first end connected to the cathode of the IR LED;
a first transistor, wherein a drain of the first transistor is connected to a second end of the first resistor, and a source of the first transistor is grounded;
an IR receiver having an output, anda high current driving circuit connected to the cathode of the IR LED, the high current driving circuit comprising;
a second resistor connected with a first end connected to the cathode of the IR LED, anda second transistor, a drain of the second transistor connected to a second end of the second resistor, and a source of the second transistor connected to ground,wherein the anode of the IR LED, a gate of the first transistor, and the IR receiver are communicatively coupled to a computing device, and the computing device is configured to receive a signal from the multifunctional IR module based on the output of the IR receiver,wherein a signal applied to the gate of the second transistor increases the current of the IR LED.
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Accused Products
Abstract
A multifunctional infrared (IR) module is configured for multiple IR applications without an additional microcontroller to be integrated into a computing device and is able to utilize voltage control instead of current control. The multifunctional IR module includes an IR light emitting diode (LED), and an IR receiver (e.g., photodiode or phototransistor). In one embodiment, the multifunctional IR module includes a resistor that is connected to the cathode of the IR LED and the drain of a transistor, with the source of the transistor grounded. In some embodiments, the multifunctional IR module additionally includes a red LED. Various configurations of the multifunctional IR module are able to perform one or more of the following functions: IR in (receiving IR signals), IR out (generating IR signals), heart rate sensing, SpO2 (oxygen saturation) sensing, distance/proximity detection, gesture detection, LED control, and ambient light detection.
7 Citations
17 Claims
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1. A multifunctional infrared (IR) module comprising:
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an IR light-emitting diode (LED) having an anode and a cathode; a first resistor having a first end connected to the cathode of the IR LED; a first transistor, wherein a drain of the first transistor is connected to a second end of the first resistor, and a source of the first transistor is grounded; an IR receiver having an output, and a high current driving circuit connected to the cathode of the IR LED, the high current driving circuit comprising; a second resistor connected with a first end connected to the cathode of the IR LED, and a second transistor, a drain of the second transistor connected to a second end of the second resistor, and a source of the second transistor connected to ground, wherein the anode of the IR LED, a gate of the first transistor, and the IR receiver are communicatively coupled to a computing device, and the computing device is configured to receive a signal from the multifunctional IR module based on the output of the IR receiver, wherein a signal applied to the gate of the second transistor increases the current of the IR LED. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification