Manual

Return Value Distance to Object

<=585 80 cm or longer

585 to 3446 80 to 8 cm

>=3446 0 to 8 cm

Remarks:

The relationship between the return data and the distance is not linear. Please refer to the

sensor’s datasheet for distance-voltage curve. The data returned is the raw data of the

analog to digital converter. The output voltage of the sensor can be calculated from the

following equation:

Sensor output voltage = (ival) * 3.0 / 4095 (V)

(e.g. Sharp GP2Y0A21YK

“http://sharp-world.com/products/device/lineup/data/pdf/datasheet/gp2y0a_d_e.pdf”)

III.1.3. Human Sensors

25 short GetSensorHumanAlarm1 ();

26 short GetSensorHumanAlarm2 ();

Description:

GetSensorHumanAlarm returns the current human alarm data from DHM5150 Human

Motion Sensor Module. Please refer to the DHM5150 hardware manual for detailed

information.

Syntax: ival = GetSensorHumanAlarm1(); //1

human alarm

ival = GetSensorHumanAlarm2 (); // 2

human alarm

Parameter: void

Return value: short ival;

Return data interpretation:

The return data is the raw value of the analog to digital converter indicating the amplified (x

5 times) output voltage of the sensor device. The data range is between 0 and 4095. When

there is no human present, the module output voltage is about 1.5 V and return value is

about 2047.

Remarks:

To detect human presence, the application should compare the difference of two samples

(to detect the change from “absence” to “presence”), and also compare the sample data to a

user defined threshold (to determine whether to report an alarm or not). The threshold

determines the sensitivity of sensor. The higher the threshold is the lower the sensitivity

will be.