Reference Design of an Infrared Human Sensor

By Sharad Bhowmick

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This low-cost reference design can help you detect human presence. This reference design can be integrated with light to build temporary lighting in entrances, porches, stairs and bathrooms.

Are you tired of switching on and off lights whenever you enter your garage or porch where light is required only when someone is present. Do you want to automate your lightings so that the lights can switch on/off without manually operating a button? Then this reference design is all you need.

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This reference design from Renesas is of a low-cost infrared human sensor that is based on the reflective infrared induction principle. The energy saving design requires few component to construct making it inexpensive and ideal for temporary lighting in entrances, porches, stairs and bathrooms. The device uses RL78/G10 microcontroller (MCU) which is a10-pin LSSOP general purpose MCU. The reference design operates when people come close, the bulb lights up, and when they leave, the bulb goes out automatically.

The reference design works with a 220V AC supply and has a low power consumption current. It is capable of relaying an output of up to 3A/250 VAC and has a lightning time of 10s.

Key features of this reference design are:
• On-chip single power supply flash memory
• On-chip debug function
• On-chip selectable power-on-reset (SPOR) circuit
• On-chip watchdog timer (operable with the dedicated low-speed on-chip oscillator)
• On-chip key interrupt function: 6 key interrupt input pins
• On-chip clock output/buzzer output controller
• On-chip BCD (binary-coded decimal) correction circuit

This reference design has been tested by Renesas. The company has also provided additional resources such as schematics, Gerber files, etc. You can find additional data about the reference design on the company’s website. To read more about this reference design click here.

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