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Learning KitsUSB DAQ Training KitEMANT300 USB DAQ
module, Light Application
Adaptor, USB Cable,
Instructional Guides
Bluetooth DAQ StarterKitEMANT380 Bluetooth DAQ
module, Light Application
Adaptor, 3.3V regulator,
Battery Holder,
Instructional Guides
DAQ ModulesEMANT300 USB DAQModule24 bit ADC, 8 bit Current
Output, 8DIO, PWM or
Counter
EMANT380 BluetoothDAQ Module24 bit ADC, 8 bit Current
Output, 8DIO, PWM or
Counter
Application AdaptorsLight ApplicationAdaptor3 LEDs, 1 switch, 1 Light
Sensor, 1 Thermistor,
Screw Terminals for
external circuits
Bridge SensorApplication Adaptor3.3V excitation, Up to 3
bridge inputs
Pressure ApplicationAdaptor200 kPa Freescale
MPX2202, +/0.25%
Linearity, Differential
Configurations
Prototype BoardApplication AdaptorPrototype board with DB25
socket. Soldering required
Discontinued Products
The following information is for the EMANT300
Measure Light Intensity using Light Dependent Resistor (LDR)The resistance of the Light Dependent Resistor (LDR) varies according to the amount of light
that falls on it. The relationship between the resistance RL and light intensity Lux for a
typical LDR is
RL = 500 / Lux Kohm
With the LDR connected to 5V through a 3.3K resistor, the output voltage of the LDR is
Vo = 5*RL / (RL+3.3)
Reworking the equation, we obtain the light intensity
Lux = (2500/Vo 500)/3.3
For a low cost LDR, at the same light intensity, the part to part variation in resistance can be as high as 50%.
Therefore such a low cost LDR is seldom used for measuring light intensity but more for light presence/absence
detection.
Parameter Min Typ. Max Units Test Conditions
RL Light Resistance 20 100 Kohm 10 lux
5 Kohm 100 lux
Table 1: Typical Low Cost LDR Specification
If a more accurate light intensity measurement is required, we recommend using the Photodiode (see Application
Note on Measuring Light Intensity using Photodiode)
The LabVIEW VI that reads the voltage across the LDR and converts the voltage to lux is called EMANT300
Example LDR.VI
Front Panel
Block Diagram
TutorialsPython for Android,
Windows, Raspberry Pi,
Ubuntu
Visual Basic 2010 .NET
Visual C# 2010 .NET
LabVIEW
Related SitesSensor Cloud
Smartphone DAQ
Raspberry Pi DAQ
Application NotesCompare EMANT 300/380
Windows 8
Measure BiopotentialECG
Measure StrainStrain Gauge
Center of Pressure
Hand Dynamometer
Pinch Meter
Measure LightPhotodiode
LDR
Heart Rate Monitor
Measure PressureSilicon Piezoresistive
Hydrostatic Pressure
Blood Pressure
Measure TemperatureThermocouple
Thermistor
Multiple Thermistors
Diodes
Measure Power Solar Panel Voltage Current
Measure Frequency Counter
Digital IO 3A 250Vac Switch
DC Fan Speed Control
Stepper Motor Control
Measure Distance Ultrasonic sensor
Other Applications Analog Input > 2.5V
10V Analog Output
Use multiple EMANT300
PID Temperature Control
C# Strain Logger to Excel
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