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制造商零件编号 EKMC4607112K
LOW PROFILE LENS, 170UA, HIGH SE
Panasonic Electric Works
SparkFun Launches Panasonic PIR Sensor Breakout Boards
2021-03-25 | By Nate_Larson
Passive infrared, or PIR sensors, have been around since the 1950s, but with the desire for energy savings, automation, and security it seems we are now seeing these sensors more frequently. SparkFun has now released a series of Qwiic and standard breakout boards featuring Panasonic PIR sensors that improve on this decades-old sensor.
How do PIR sensors work
PIR sensors, as the name implies, are passive. Meaning they do not emit any infrared signals for detection. Instead, they sense the infrared radiation, also known as radiant heat, that is emitted by objects within the field of view. The sensors detect changes in the infrared signal, such as the movement of an animal or person through the detection zone, and trigger when the signal reaches a set threshold making them commonly referred to as motion detectors.
What’s New?
Panasonic’s EKM series of PIR sensors are low profile, which allows easier integration into products. Above, you can see the size comparison of a typical generic PIR sensor versus that of the Panasonic sensor on the SparkFun breakout board. Think of how often you’ve walked into an empty room where a TV is on. It would be much easier to integrate the smaller sensor into the bezel of the television, allowing it to automatically turn off if no presence was detected for a pre-defined period of time.
With the lens of the larger sensor removed, you can see the actual sensor of the larger PIR sensor. One-way Panasonic has miniaturized this sensor is by integrating the fresnel lens and can sensor into a single body. By doing this, Panasonic can configure the sensor to have a 90° x 90° detection area with 32 detection zones and a detection range of 5 meters.
Typically, the output signal of a PIR sensor is very low, requiring amplification circuitry as we see on the back of the generic PIR sensor board above. However, Panasonic has also integrated this into its sensor design for an all-in-one sensor package. This may leave you wondering about power requirements for the EKM series sensors. The EKMC sub-series has a current draw of 170uA, while the EKMB sub-series is optimized for battery-powered applications and only draws 1, 2, or 6uA depending on the specific part.
The Boards
SparkFun offers breakout boards featuring either the EKMB1107112 or EKMC4607112K sensor. The EKMC4607112K sensor is a 170uA low-profile PIR sensor with a black lens and is available in the SEN-17372 standard breadboard compatible version, or the SEN-17374 Qwiic board. Additionally, the EKMB1107112 sensor is also available in the SEN-17373 standard breakout or the SEN-17375 Qwiic version.
The Qwiic boards include an ATTiny84 acting as an I2C interpreter that allows communication with the sensor using standard I2C communication protocol and two Qwiic connectors for solderless prototyping and the ability to daisy-chain boards on a single communication bus. SparkFun provides a hookup guide, Arduino and Python libraries, and schematics these boards.
Features include:
- Default I2C address 0x12 (Alternate 0x13 selectable by solder jumper)
- 2x Qwiic connectors
- 2x3 header on the back of the board for reprogramming the ATTiny84
- Lens diameter - 10.4mm
- Lens height - 10.9mm
- 1µA or 170 µA standby current consumption based on sensor
- 5m detection distance
- 90° x 90° (±45°) detection area
Standard breakouts provide direct interaction with the sensor in a small form-factor with a standard 0.1” (2.54mm) pinout compatible with breadboards and perfboards. Schematics and a hookup guide are available for these boards.
Features include:
- Operating Voltage: 2.3 - 4.0V
- 1uA standby current consumption
- Lens diameter - 10.4mm
- Lens Height - 10.9mm
- 5 m detection distance
- 90° x 90° (±45°) detection area
These sensors are optimal for detecting small movements, such as typing at a keyboard, making them perfect for energy-saving, smart-automation, and security applications.
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