Overview
Description
This Infrared Human Sensor reference design detects human presence/absence using an infrared sensor, and turns on/off a high-brightness LED automatically. It can be applied to a wide range of applications, including office lights and automatic doors.
The infrared LED sending signal is controlled by Renesas' RL78/G10 MCU's timer array unit (TAU01), and the receiving signal is controlled by the timer array unit (TAU00) and external interrupt terminal (INTP0). When a person is detected, the high-brightness LED will light up. Once the person leaves the detection area after 10 seconds, the LED will go off and the system will enter an infrared receiving signal STOP mode. RL78/G10 offers the lowest current consumption in the industry and is ideal for human sensing.
The Infrared Human Sensor solution features the RL78/G10 10-pin LSSOP general-purpose microcontroller. The sensor is inexpensive and provides energy savings. It is ideal for temporary lighting in entrances, porches, stairs, and bathrooms. For example, when people approach, the bulb lights up; when they leave, the bulb goes out automatically.
Features
- The demo board includes the RL78/G10 MCU.
- The infrared detection function consists of an infrared signal-emitting circuit and an infrared-receiving detection circuit.
- In infrared detection status, the system executes both the infrared signal-emitting task and the infrared-receiving detection task simultaneously.
- If a human body is detected, the LED lights up for 10 seconds. While the LED is on, infrared detection is paused.
- After 10 seconds, the LED turns off. The system resumes detection based on an interval controlled by a watchdog timer interrupt.
- The system uses a 40kHz infrared carrier wave signal to reduce interference.
- When the system is idle, it enters infrared detection status every 400ms.
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Videos & Training
Renesas demonstrates the Infrared Human Sensor quick solution featuring the RL78/G10 microcontroller. This is a solution that detects human presence or absence by an infrared sensor and turns on/off high brightness LEDs automatically.