IngovM
Created January 28, 2020

The Fire Patrol Drone

Combining autonomous drone patrolling with heat spot detection, alarms, and providing a possibility for live analysis via FPV video stream.

AdvancedFull instructions providedOver 1 day30

Things used in this project

Hardware components

Melexis MLX90614 IR heat sensor
×1
VM275T 5.8GHz 25mW 48CH NTSC/PAL Mini VTX 600TVL FPV Camera
×1
Turnigy 5000mAh 3S 20C Lipo Pack w/XT-60
×1
Quanum Cyclops FPV goggles with integrated monitor and receiver
×1
RDDRONE-FMUK66
NXP RDDRONE-FMUK66
×1
KIT-HGDRONEK66
NXP KIT-HGDRONEK66
×1

Software apps and online services

PX4
PX4
MAVLink
PX4 MAVLink
QGroundControl
PX4 QGroundControl

Story

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Schematics

Melexis MLX90614 IR sensor to NXP Hovergames drone

Connecting Melexis MLX90614 IR sensor to NXP Hovergames drone

Source: https://nxp.gitbook.io/hovergames/addons/melexis-mlx90614

Code

QGroundControl custom widget

XML
Custom widget written in QML for QGroundControl that
o reads and displays the received temperatures from the QGroundControl fact system;
o compares the temperatures against a threshold value. Lower temperatures are reported as Temperature OK, exceeding temperatures cause a Temperature ALARM.

To enable our custom widget click Widget -> Custom Command -> Load hovergames.qml.
import QtQuick 2.2

import QGroundControl.Controls      1.0
import QGroundControl.FactSystem    1.0
import QGroundControl.FactControls  1.0
import QGroundControl.Palette       1.0
import QGroundControl.ScreenTools   1.0
import QGroundControl.Controllers   1.0

Rectangle {
    anchors.fill:   parent
    color:          qgcPal.window
    property var threshold: ({ value: '30.0' })
    

    function testTemperature(temperature) {
        if (temperature < threshold.value) {return "Temperature OK";}
        else {return "Temperature ALARM";}
    }

    function getTemperatureColor(temperature) {
        if (temperature < threshold.value) {return qgcPal.colorGreen;}
        else {return qgcPal.colorRed;}
    }

    CustomCommandWidgetController {
        id:         controller
        factPanel:  panel
    }

    QGCPalette { id: qgcPal; colorGroupEnabled: enabled }

    Column {
        spacing: ScreenTools.defaultFontPixelHeight
        property var    _activeVehicle: QGroundControl.multiVehicleManager.activeVehicle ? QGroundControl.multiVehicleManager.activeVehicle : QGroundControl.multiVehicleManager.offlineEditingVehicle
     
        QGCLabel {
            text:           "Measured Temperature"
        }  
        
        FactTextField {
            // Display the currently measured temperature
            // You can replace it with a specific component id if you like
            fact: _activeVehicle.temperature.getFact("temperature1")
        } 

        QGCLabel {
            text:           "Threshold"
            anchors.right:  parent.right
            anchors.left:   parent.left
            wrapMode:       Text.WordWrap
            visible:        true
        }

        QGCTextField {
            text:           threshold ? (threshold.value ? threshold.value : "") : ""
            visible:        true
            showUnits:      true
            unitsLabel: { return "C" }
            anchors.right:  parent.right
            anchors.left:   parent.left
            inputMethodHints: Qt.ImhFormattedNumbersOnly
            onAccepted: { threshold.value = parseFloat(text) }
            onEditingFinished: { threshold.value = parseFloat(text) }
        }

        QGCLabel {
            text:   { return testTemperature(_activeVehicle.temperature.getFact("temperature1").value) }
            color:  { return getTemperatureColor(_activeVehicle.temperature.getFact("temperature1").value) }
        }  
    }
}

Forked PX4 Firmware

Customized PX4 Firmware • Defined a custom uORB message sensor_hg_mlx90614.msg. • Introduced a new example “hovergames“ in src/examples/hovergames. When started, it reads values from the temperature sensor and publishes them as custom uORB messages. • Added a MavlinkStream for “scaled pressure“-messages in src/modules/mavlink/mavlink_messages.cpp. The code subscribes to our custom uORB sensor message and transmits the measured temperatures via Mavlink MAVLINK_MSG_ID_SCALED_PRESSURE to QGroundControl. • Configured ”SCALED_PRESSURE“ stream to be sent with 1Hz in src/modules/mavlink/mavlink_main.cpp

Credits

IngovM

IngovM

1 project • 0 followers
NXP employee

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