Author Topic: Hti HT-301 384 x 288  (Read 19522 times)

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Offline alex871

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Re: Hti HT-301 384 x 288
« Reply #125 on: January 25, 2020, 03:16:02 am »
« Last Edit: January 25, 2020, 03:36:52 am by alex871 »
 

Offline NinetySix

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Re: Hti HT-301 384 x 288
« Reply #126 on: January 25, 2020, 04:49:15 am »
I think Thermovision_JoeC might be able to analyse the data. The .txt file contains temperature values like "3072 2983 2975 3004" for 30.72, 29.83, 29.75, 30.04 deg C. I assume that's the value for each and every pixel
 

Offline alex871

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Re: Hti HT-301 384 x 288
« Reply #127 on: January 25, 2020, 11:56:35 am »
I think Thermovision_JoeC might be able to analyse the data. The .txt file contains temperature values like "3072 2983 2975 3004" for 30.72, 29.83, 29.75, 30.04 deg C. I assume that's the value for each and every pixel


I've tried with Thermovision_JoeC now but can't open the txt file
 

Offline Bill W

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Re: Hti HT-301 384 x 288
« Reply #128 on: January 25, 2020, 01:07:30 pm »
If the file coding is that simple, then a bit of file manipulation (hex editor, spreadsheet or even NotePad++)  and then Image J to display.  No software authoring needed.

Image J can import a 'text image' where it gets a text file with each pixel a text value.


Bill

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #129 on: January 25, 2020, 03:06:24 pm »
Some photos from inside

914434-0
 

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #130 on: January 25, 2020, 03:07:10 pm »
914438-0
 

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #131 on: January 25, 2020, 03:09:36 pm »
[ Specified attachment is not available ]
 

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #132 on: January 25, 2020, 03:10:46 pm »
914464-0
 

Offline NinetySix

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Re: Hti HT-301 384 x 288
« Reply #133 on: January 25, 2020, 11:59:50 pm »
Be very careful with the fpc ribbon cable for the USB plug, especially where it is folded 180 degrees then stuffed into a very tight gap between the USB plug PCB and the main board & shutter...

I can only imagine that a hard 180 degrees crease of an fpc ribbon is generally considered poor practise. The copper had snapped at the bend, only the polyimide was holding it together.

After only the 2nd disassembly... The first was due to water ingress (they could have made this camera ip67 with very little effort or added cost!) which had me worried... The camera just wasn't working at all, no click from the shutter no detection of anything by the phone, open it up and rinse it out with IPA, let it dry, reassemble and it works perfectly again... Then the USB plug seemed to be the issue, like constantly disconnecting unless you held the camera firmly against the phone, and eventually not working at all any more.

I've emailed HTI but I guess they are having a week off for lunar new year
« Last Edit: January 26, 2020, 12:01:34 am by NinetySix »
 
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Offline alex871

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Re: Hti HT-301 384 x 288
« Reply #134 on: January 26, 2020, 01:57:54 am »
Be very careful with the fpc ribbon cable for the USB plug, especially where it is folded 180 degrees then stuffed into a very tight gap between the USB plug PCB and the main board & shutter...

I can only imagine that a hard 180 degrees crease of an fpc ribbon is generally considered poor practise. The copper had snapped at the bend, only the polyimide was holding it together.

After only the 2nd disassembly... The first was due to water ingress (they could have made this camera ip67 with very little effort or added cost!) which had me worried... The camera just wasn't working at all, no click from the shutter no detection of anything by the phone, open it up and rinse it out with IPA, let it dry, reassemble and it works perfectly again... Then the USB plug seemed to be the issue, like constantly disconnecting unless you held the camera firmly against the phone, and eventually not working at all any more.

I've emailed HTI but I guess they are having a week off for lunar new year



How come you had this problem? Is it an isolated case or is it a frequent problem?
 

Offline NinetySix

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Re: Hti HT-301 384 x 288
« Reply #135 on: January 26, 2020, 03:50:24 am »
I may have just been unlucky, but I think it's safe to say that the fpc ribbon really wasn't designed with being able to access the internals in mind.

A brief Google search found the below on another forum, from a design guide for LCD displays:

Quote
Typical FPC are rated 0.3 mm thick at the contact point stiffener. This is not the bending point.
Most FPC are thinner away from that point. For an FPC that is 0.120 mm thick in the bend area, the minimum bend radius is 1.2 mm for a 90 degree bend. A 180° bend requires a larger radius to prevent creasing. Small radius bends greater than 90° should be formed ONCE and not unbent.

There is probably less than 1mm of room for the 180 degree bend in the fpc on the 301, so if the last sentence above is anything to go by, you're gonna need to replace the ribbon should you ever need to take the USB plug out of the camera...

If you get it wet, just take the back cover off and rinse with isopropyl alcohol, save yourself some grief by not moving the fpc for the usb-c
 

Offline NorVik

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Re: Hti HT-301 384 x 288
« Reply #136 on: February 09, 2020, 11:15:29 pm »
Im ordering the ht-301, seems pretty awesome!

Now here is the big question...... Would it somehow be possible to use this somehow connected/strapped to a DJI Mavic Mini (249g)?
The small size of this is good for regulations, so if its possible somehow to use this for this kind of application, that would be awesome!

Any ideas?
 

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #137 on: February 12, 2020, 05:28:25 pm »
Ice water.  All palletes

https://youtu.be/SFOn1joRf90


 

Offline alex871

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Re: Hti HT-301 384 x 288
« Reply #138 on: February 12, 2020, 09:27:58 pm »


 

Offline dunkemhigh

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Re: Hti HT-301 384 x 288
« Reply #139 on: February 12, 2020, 09:51:57 pm »
Those videos are very impressive, but unless the temperature range can be locked they're much less useful than first appears. For instance, suppose you had a second pan of whatever it is and you want to just check if this one is close to the same temperature. You pan to the other, ah, pan and see that the colour is a good match. Simples. except if you can't lock the palette range then the colour is pretty meaningless as soon as you change the average temperature in the view.
 
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Offline alex871

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Re: Hti HT-301 384 x 288
« Reply #140 on: February 13, 2020, 10:37:20 pm »
Those videos are very impressive, but unless the temperature range can be locked they're much less useful than first appears. For instance, suppose you had a second pan of whatever it is and you want to just check if this one is close to the same temperature. You pan to the other, ah, pan and see that the colour is a good match. Simples. except if you can't lock the palette range then the colour is pretty meaningless as soon as you change the average temperature in the view.

It is possible to block but in the video I did not
 

Offline dunkemhigh

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Re: Hti HT-301 384 x 288
« Reply #141 on: February 14, 2020, 07:49:36 am »
OK, thanks :)
 

Offline alex871

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Re: Hti HT-301 384 x 288
« Reply #142 on: February 16, 2020, 11:57:08 am »
Photo from Rome
 

Offline therwp

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Re: Hti HT-301 384 x 288
« Reply #143 on: March 02, 2020, 09:18:37 pm »
This calls for a side by side shootout  8) once I fix the wonky usb-c plug on my 301 that is..... Anybody else having trouble with it falling out of their phone, or the connection dropping out? My charge port is brand new, and it's definitely not dirt causing it.

Yup. And I posted a solution that works for my device today. Copying from that thread:

"The HT-301 is a great thermal imaging camera, but mine is less-than-great at reliably connecting to my Samsung Galaxy S9+ over USB-C. The app will often close because of a lost connection, and I have had to use a rubber band around the camera and phone just to hold it in the right spot (once I find it) so as to avoid losing the connection. That solution kind of works most of the time.

But I found a solution that does work. All of the time.

I have a few USB-C in-line power meters that pass data through. For reasons unknown to me, the HT-301 works perfectly when connected to the phone through a power meter. Directly? It almost never works the first couple of tries and is shaky thereafter. I don't understand why this would work, but it absolutely does. If anyone out there is having the same issue, try this. You'll once again be thrilled with your purchase. And if anyone out there understands what's going on here, I'm certainly curious.

Very interested in hearing whether it works for yours as well.

(Photos in the other thread. For some reason I can't convince them to embed here.)

https://www.eevblog.com/forum/thermal-imaging/a-sort-of-solution-to-ht-301-intermittent-usb-c-connectivity/
 

Offline matohak

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Re: Hti HT-301 384 x 288
« Reply #144 on: March 03, 2020, 07:36:30 pm »
Does it come with a protective carrier case and what does it look like?
 

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #145 on: March 04, 2020, 07:08:50 am »
 
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Offline NinetySix

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Re: Hti HT-301 384 x 288
« Reply #146 on: March 04, 2020, 08:00:00 am »
I posted in that thread... But what I'll say is, I've often gotten a far better connection using a short 90 degree USB-c extension lead, better at both ends. I think overall it's a fairly low quality plug that it comes with, and compared to better plugs - such as the kind that usually come with a phone, the charger lead on my last few Nexus/pixel devices has been top notch and all held up well for years... Perhaps it's just a bit more fussy about whom it mates with.
 

Offline matohak

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Re: Hti HT-301 384 x 288
« Reply #147 on: March 07, 2020, 05:51:06 pm »
Also, does anyone know if we can buy alternative lenses for the HT 301? Are there any standards for the screw size / sensor sizes for this type of camera?
 

Offline RBsonic

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Re: Hti HT-301 384 x 288
« Reply #148 on: March 08, 2020, 02:34:31 pm »
Also, does anyone know if we can buy alternative lenses for the HT 301? Are there any standards for the screw size / sensor sizes for this type of camera?
There is some information about screw size:
https://yadi.sk/d/cKbfsocK7y2jZg
 
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Offline Ambassador

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Re: Hti HT-301 384 x 288
« Reply #149 on: March 08, 2020, 04:37:34 pm »
I'm tired of looking for information. Is it possible to block the color palette in the native HT 301 app?
If there is, how do I do it?
 :scared:
 


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