PLD (Part 5)

Part 123456

HL2 PLD may be used for safety applications too. In this configuration, the PLD is able to detect movements up to 7 m away within and almost 90° view angle. It features a PIR (Passive Infra Red) sensor from Panasonic.

This sensors is available in different sizes depending on the required range; the enclosures are available in white or black. On top of these specifications, various power consumptions are available, ranging from 1 µA to 6 µA. This criteria may be critical regarding the applications and the expected battery life time. More reading on this sensor > here <. Few extra component are required to convert the output signal from the sensor to the PLD: actually a N-channel MOSFET and a pair of resistors.

The sensor is encapsulated in a 3D housing which nicely fit the bottom gland from the PLD. In this way, the sensor can be oriented in any direction in the horizontal plane.

HL2 Panorama features all sorts of widgets: gauges, graphs, text, state buttons and tables. In this case, I used a gauge for the power reserve and a state button for the current state: RAS means “Nothing to declare” in French.

The principle of operation is rather simple and prevents sending useless information on the LPWAN networks. As soon as a movement is detected, the PLD sends a “NOK” status. Then, during a fixed period of time, the PLD will count the number of times it senses a movement. On completion of this fixed time, if no event is in progress, it releases a “OK” status along with the number of movements sensed. In this way you are aware about a presence right away, and on completion of the event you get an idea about how frequent where the movements. As the HL2 PLD is arduino ™ compatible, you can start from there and fine tune the code to your own taste !

Using no power line, no network cable and a small compact device will help you to monitor motions in a distance place for years.

Is this what you need ? Pay a visit to our Kickstarter campaign > here <

Would you like to get the STL file for the sensor housing ? > Here < it is and this is how it looks.

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