SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-29T06:01:45-06:00SparkFun Electronicslidarman on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)lidarmanurn:uuid:9d3d7deb-b9b2-c6d9-9b76-f4aa5d92d26f2024-03-24T23:13:15-06:00<p>I am having a lot of difficulty using this to write to a uSD card using OpenLog. Maybe I can't figure it out but it seems to want to have a serial port connected to run the 'mysensor'.begin(). Without a serial port connected, it hangs up. Once a serial port is connected the data will write to the SD card fine using open log. I want to run it stand-alone so my solution so far is to get an old phone, install a serial monitor app and use it to monitor data, power everything and actually have a logging back-up by recording the serial feed.</p>
Customer #1667976 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #1667976urn:uuid:8b88b9c0-901d-5dd0-63fe-639d9c3916d62021-08-07T10:27:29-06:00<p>what is the frequency response for detecting pulsed light?</p>
Customer #1483787 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #1483787urn:uuid:d0665474-c3a7-48bd-24b4-149dfae9df9a2018-12-14T07:34:19-07:00<p>How is your wiring? I can't get it to work properly. I connected the board via i2c, but the only thing i get is 'i2c error' via serial. :/</p>
Customer #1406136 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #1406136urn:uuid:84ecb4ca-9a1d-2175-12de-42e52f90a7242018-08-18T15:36:26-06:00<p>what is the best distance for making the reading? thank you</p>
Customer #42045 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #42045urn:uuid:a928dfd9-bbd6-4605-c746-67ad7e4757f42018-01-21T01:44:38-07:00<p>Hello,<p>Apparently, apart from the AS7262 and AS7263, AMS also makes a AS7261. That one would be able to produce X Y Z CIE coördinates. See http://ams.com/eng/Products/Spectral-Sensing/Multi-spectral-Sensing/AS7261 .
Other interesting chips are the AS7264N and AS7265 , the latter delivering even 18 sensor channels.</p><p>Would these chips be usable on the same breakout board? Has Sparkfun any intentions to produce a breakout for any of these too?</p><p>Beste regards, Marc</p></p>
Customer #1239648 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #1239648urn:uuid:4caf9ee1-f7d8-1546-4214-58248614ce5a2017-11-28T19:32:46-07:00<p>I just got the sensor and the SparkFun Serial Basic Breakout - CH340G.
Has anyone used the Serial communication to control the sensor?</p>
Customer #1224774 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #1224774urn:uuid:ce489aa1-763a-3393-e218-89679ea301642017-11-18T15:53:37-07:00<p>I was playing with the visible spectrum version a bit.
I have connected it to an Arduino via an standard i2c 5V -> 3.3 V level shifter.<p>By now I am just using it for transmitted light measurements, using a warm white LED as light source, and some ROSCO color filters as objects. But you may also use it to perform measurements using solutions.</p><p>I have written an instructable on this. If you are interested, please have a look here:
https://www.instructables.com/id/A-Mimimal-Six-Color-Transmitted-Light-Spectrophoto/</p><ul>
<li>I would link to use the sensor on a Raspberry Pi. Is there an example code for the Raspberry available?</li>
</ul></p>
8r13n on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)8r13nurn:uuid:2297ab9c-4a67-3d6d-8507-85a1b1dafeef2017-11-17T14:12:43-07:00<p>I've worked with a lot of spectrometers, etc. in the past. I had hopped that this would work as a spectrometer, it doesn't. The filters are only somewhat effective.<p>My first test involved using a UV LED. This LED only outputs light from ~290-~340nm. The AS7262 showed light coming in on all channels, including the 650nm (even though there was no green, yellow, orange or red light coming from my LED).</p><p>This is the same problem you'll experience using thin films like those used in popular PublicLabs projects (usually Rosco filters).</p><p>This is still a cool device, probably good for something. And the signal quality is pretty decent (nice ADC S/N) but the readings are by no means accurate.</p></p>
Customer #1221187 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #1221187urn:uuid:1a517d20-392d-b781-9c86-a76c24939f1e2017-11-16T04:52:36-07:00<p>Hi. I can`t find any information about the purpose of Flash-chip and the possibility of working with AS726x without it. Could you please make it clear for me?</p>
8r13n on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)8r13nurn:uuid:be4be0b7-90e8-e797-29cc-9157d67d9acc2017-11-15T14:05:46-07:00<p>So I bought this an the NIR version. Both have the same I2C address? How can I use them at the same time?<p>EDIT: In my case, since I'm using an ESP8266, I realize now I can just wire this module to two lines, and the NIR module to another two lines. But normally I'm working with hardware that has dedicated I2C pins and this would have been a problem. Please make the addresses different! (Likely just a programming thing since I don't see pins for it?)</p></p>
davolfman on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)davolfmanurn:uuid:c37904d0-a7f0-c1bd-0f04-5856c28240b52017-11-08T23:42:56-07:00<p>This looks about right for building a homebrew monitor profiler that actually yields useful results. It's not quite the 7 filters or whatever a Spyder has, but it's probably enough to find the color primaries of a screen in XYZ or LAB.</p>
Englandsaurus on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Englandsaurusurn:uuid:48469bb5-ef41-8554-1f80-8aafe9ef5cce2017-11-01T10:51:54-06:00<p>Absolutely! CMOS sensors incorporate <a href="https://en.wikipedia.org/wiki/Bayer_filter" rel="nofollow">Bayer Filters</a> to separate light into it's red green and blue components. I am unsure of the spectral range on many of these Bayer Filters, but your interpretation in the above comment is spot on. You would see some signal pop up in both red and green, but it would probably be noisy, and you'd have to account for the spectral range of each Bayer Filter (no fun) in order to correctly read your values.</p>
Customer #12534 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #12534urn:uuid:36d07509-33e3-c4dc-ada4-b89b944a756c2017-11-01T10:38:42-06:00<p>Thanks Englandsaurus, really appreciate the explanation. So, just for my own edification, let's say I have a pure yellow signal that I want to detect (i.e. centered right at, say, 570nm with very low bandwidth). The AS7262 would be able to pick that up loud and clear with the dectector centered on that wavelength. With a conventional RGB image sensor, however, the more "pure" that signal is, the worse the signal to noise ratio becomes, because there is less signal bleeding over into the RGB part of the spectrum for the RGB detectors to sense. Am I close? Thanks, again. Plan to buy a few of these to play around with.</p>
Englandsaurus on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Englandsaurusurn:uuid:9cb030fc-ef8a-1495-7a16-918dc42f1df12017-10-31T13:42:57-06:00<p>You could not, the conventional camera sensor only has active pixel sensor's for red green and blue (Only 3 channels are necessary as these are what you need to produce an image on any RGB display, we only need this many channels for image production as the human eye only has 3 different types of cones) The AS7262 series has 6 different channels, allowing for detection of wavelengths in between red green and blue; something your average CMOS sensor is incapable of. The AS7263 senses 6 different wavelengths in the near infrared spectrum, something most cameras are not equipped for. (unless you happen to have an infrared camera) These sensors also use a silicon Interference filter as opposed to the active pixel sensors used in a CMOS sensor. This gives them a narrower band of spectral sensitivity.<p>In short, you wouldn't be able to accomplish the same with additional signal processing and a camera due to the fact that these sensors are able to detect twice as many different wavelengths as the traditional camera.</p></p>
Customer #12534 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #12534urn:uuid:369a38dc-5d48-fb38-d3ea-5d15ccd060f72017-10-31T13:25:26-06:00<p>Sincere Question: Couldn't you do all this with a conventional camera module / sensor + additional signal processing? Are the advantages of this sensor just cost + easier signal processing? Seems cool, just wondering if I'm missing something...</p>
Customer #20244 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #20244urn:uuid:285465a3-b180-d66a-bf0f-399e40a8c0be2017-10-25T05:50:32-06:00<p>Thanks, that sounds perfect. It seems, this module combined with a wide spectrum LED as a light source would be perfect for a DIY fixed wavelenghts (6 channels) small photometer for digital readout of some colorimetric water tests (after calibration curves with the corresponding standard solutions have been calculated of course). What do you think?</p>
Englandsaurus on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Englandsaurusurn:uuid:e83af3ef-e265-874c-dc37-32bdfc7add7a2017-10-24T09:58:51-06:00<p>Don't worry, Flash is pre-programmed so you won't have to muck about with all of that. Calibrated data is read from four registers on the AS726X and converting to a 32-bit float, while raw data is read from 2 separate registers. Calibration is performed by the chip using a stored correction matrix provided by AMS. Hope this helped!</p>
Customer #20244 on SEN-14347 - SparkFun Spectral Sensor Breakout - AS7262 Visible (Qwiic)Customer #20244urn:uuid:5ef9a65a-fef1-3240-66d3-cb3603f519bd2017-10-24T08:17:02-06:00<p>Does this Board come with the preprogrammed FirmWare (for the Sensor) in the Flash-Chip or do we have to program the Flash ourselves? And what is the difference between the raw and the calibrated data? Are the calibration parameters also in the Flash and who performs the calibration, AMS, Sparkfun or the end-user?</p>