ISL29125 RGB Color Light Sensor Arjun Arunasalam Varun Kutirakulam - - PowerPoint PPT Presentation

ISL29125 RGB Color Light Sensor

Arjun Arunasalam Varun Kutirakulam Vinay Revankar Avi Singh

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Contents

1. Overview 2. Camera vs. Color Sensor 3. Real World Applications 4. How we’re using it 5. Electrical Characteristics 6. Registers 7. Protocols and Operations 8. Conclusion

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SparkFun RGB Light Sensor (ISL29125)

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Camera vs. Color Sensor

• Cameras
• More Versatile
• More expensive
• Color Profiling
• Color Sensor
• Cheaper
• Can be calibrated to be more accurate and tune out external light
• Generally more reliable (depends on application)

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Applications

• Smart phones, PDAs, GPS, tablet PCs, LCD-TVs, digital picture frames,

digital cameras

• Industrial/commercial LED lighting color management
• Dynamic display color balancing
• Printer color enhancement
• Industrial Sorting or Matching

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[https://learn.adafruit.com/adafruit

• color-sensors/overview]

Use Case - Tron light cycle game

• Utilize the RGB data that the color sensor provides
• Compare it against the marker color detected
• Deduct health points from that vehicle based on

comparison results

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[https://www.topbestalternative s.com/encom-tron/psp/] [https://www.lifehack.org/article s/featured/10-things-to-do-with

• dry-erase-markers.html]

Electrical Characteristics

• Sensing Ranges

○ 5.7 mlux to 375 lux ○ 0.152 lux to 10,000 lux

• ADC Resolutions

○ 12 bits ○ 16 bits

• ADC Conversion Time

○ Inversely proportional to the resolution

• I2C Clock

○ 500 kHz

• Active IR Compensation

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Spectral Response

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Registers (Configuration and Status)

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Registers (RGB Data)

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Write Transaction

Signals From Receiver

2 bytes of data is written 1 byte for the address of data , 1 byte for data you want to store in register

Example of Write Transaction

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Signals From Receiver

0x01 1 0x02

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Read Transaction

Signals From Receiver

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Read Transaction

0x09 0x00 - 0xFF

Signals From Receiver

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Read and Burst Read Transactions

Signals From Receiver Signals From Receiver

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Read and Burst Read Transactions

Signals From Receiver Signals From Receiver

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Read Transaction

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Signals From Receiver

Interrupt Function

An interrupt can be generated on INT whenever the value from either the red, green, or blue light sensor crosses either a minimum or maximum threshold.

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When the value crosses one of the two thresholds, the RBGTHF bit in register 0x08 is asserted to HIGH and the INT pin goes LOW.

• User can configure which light sensor (RGB) will

generate interrupt, but interrupt can only be configured to one color.

• User can choose to throw an interrupt after

threshold is crossed multiple times, not every single instance.

Interrupt Function

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Configuring the interrupt

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Conclusion

• More optimal than camera for simple applications

○ Works well in our project

• Uses I2C bus protocol
• Has a convenient interrupt function
• Straightforward and understandable configurations

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Documentation

Data sheet (https://cdn.sparkfun.com/datasheets/Sensors/LightImaging/isl29125.pdf) Note: All Images taken from datasheet unless otherwise specified

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Any Questions?

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