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Diy par meter


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Making the thing wasn't to hard but calibrating the optic and getting to sit just right in the little plastic bottle was a pain. There was was one guy on the OR bulbs by the end that was making them to sell

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  • 2 months later...

I sent the unit I had to a friend to get it calibrated and on the return trip USPS machine tried to eat it for lunch it was totally destroyed get this with out a store type of receipt the poste office will not reimburse you the $50 ii was insured for the post master here in Toledo said I should of packed in a better box that is when I told him it was one of there box's I paid for his reply was I don't know what to tell you so I am just screwed

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7 hours ago, rott said:

I sent the unit I had to a friend to get it calibrated and on the return trip USPS machine tried to eat it for lunch it was totally destroyed get this with out a store type of receipt the poste office will not reimburse you the $50 ii was insured for the post master here in Toledo said I should of packed in a better box that is when I told him it was one of there box's I paid for his reply was I don't know what to tell you so I am just screwed

That is BS!  But typical for a government office I guess.

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  • 3 years later...

Hi...Essentially a "PAR" (Quantum meter) is only a photodiode and filters.When building one the hardest thing would adjust it.

Need to coordinate it to a known "genuine" meter. Second hardest thing is getting a blue upgraded photodiode since most are frail on the blue end as to reaction. Tragically the exploration truly went into the "lux" photodiode bend shape.

 

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On 1/13/2021 at 9:05 AM, ElleBlyth said:

Hi...Essentially a "PAR" (Quantum meter) is only a photodiode and filters.When building one the hardest thing would adjust it.

Need to coordinate it to a known "genuine" meter. Second hardest thing is getting a blue upgraded photodiode since most are frail on the blue end as to reaction. Tragically the exploration truly went into the "lux" photodiode bend shape.

 

Welcome to the forum, sounds like you have some knowledge about this!

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  • 5 weeks later...

rsos160592f01.jpg

 

The MultispeQ Beta PAR Sensor is calibrated to 1% accuracy with a LI-COR LI-190R Quantum Sensor.

MultispeQ Beta's TCS34715 "PAR" sensor (w/ Hot Mirror)... https://www.scirp.org/journal/paperinformation.aspx?paperid=88576
MultispeQ Beta, PhotosynQ... https://royalsocietypublishing.org/doi/10.1098/rsos.160592
AMS Document... https://ams.com/documents/20143/36005/ColorSensors_AN000166_1-00.pdf/d1290c78-4ef1-5b88-bff0-8e80c2f92b6b

 

file.php?id=4810&mode=view

This is a Simple I2C PAR Sensor (ubiquitous TCS34725 Color Sensor) for Arduino or RPi that requires;
1. White Acrylic Diffuser Lens(es) with at most 15% Transparency for 0 - 2225 umol/m2/s (PPFD) range.
2. Remote sensor housing is a 3/4" PVC slip coupling (Electrical) with a hole sized for the cable diameter (repurpose Keyboard cables?)
3. Wiring (4 - Conductor) per standard TCS34725 wiring to Arduinos, using 5V /Vin (for the remote cable sensors).
3. Require Lens, Lux and PPFD (PAR) coefficient factors and Bench "Calibration" with Lux meter or PAR meter, if available.  
4. Set up using "Fixed" (same) Parameters... 1x - Gain, 700 ms - ATime, 2.4 ms WTIME for all sensors, no exception.

These sensor still require calibration with an actual Calibrated PAR Meter for confirmation, appears to be relatively accurate, but are still a "Work in Progress". The sensors can be connected to any Arduino platform that supports the I2C bus and TCS34725 Color Sensor and works with standard Arduino displays. Design and Build are...  https://ledgardener.com/forum/viewtopic.php?p=24962#p24962

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