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