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Forum Index : Microcontroller and PC projects : ir imaging
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stanleyella Guru  Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
Could these work with pico and lcd? They are quite expensive ready made. https://www.aliexpress.com/i/1005004176046297.html not from aliexpress though, just device info. stan https://thepihut.com/products/m5stick-t-lite-thermal-camera-dev-kit-mlx90640? Edited 2023-06-26 02:10 by stanleyella |
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| mclout999 Guru Joined: 05/07/2020 Location: United StatesPosts: 469 |
https://www.aliexpress.com/i/1005004176046297.html https://thepihut.com/products/m5stick-t-lite-thermal-camera-dev-kit-mlx90640? |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
The data sheet, as normal, too complicated. why can't they make it simple foe i2c, just the commands to make it work.. buts that's a dream MLX90640-Datasheet-Melexis.pdf |
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palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1873 |
This months Silicon Chip magazine has a project for a Thermal Camera usig a AMG8833 camera module (Ali Express). It is I2C and connects to the Picomite and displays the image on an LCD display. AliExpress Edited 2023-06-26 10:22 by palcal "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| zeitfest Guru Joined: 31/07/2019 Location: AustraliaPosts: 482 |
Looks like the AMG8833 is an 8x8 array ? I hope it uses a 24x32 array which would be better |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
So that'll be 6 months before we see that article over here. If ever. :) That seems to be an excellent data sheet. Stan. You should see some of them! Remember it's a low-level data sheet for the device alone, not for a unit with that built in with a micro to control it for you. It's like seeing the data sheet for a RAM chip. This is where the Arduino libraries come in - someone will write chunks of code that you call with a simple one-line command. You don't usually attempt to use a device like that from BASIC - it's too high level and slow. You need C to get the best out of it as you need two complete frame scans to build up a picture - very much like the system used on TVs, only on this you have a choice of either alternate lines (like PAL) or alternate pixels in a checkerboard (the default). Either way needs a frame buffer to store the completed image and a CPU to keep it updated. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
Thanks Mick. I've seen data sheets for ili9341 and ssd1306 and Vl53lox but to difficult for me to initialise and use the devices with gcbasic, had to wait until the displays were included and vl53lox explained. Arduino has libraries for nearly any device but in C. Raspberry Pi has libraries in python which is probably easier to convert to basic. So this thermal imager won't be doable with mmb and pico it seems. Maybe 1 sensor like in a cheap laser thermometer mounted on a rc servo scanning L-R mounted on another rc servo scanning U-D. As it scans temp ic converted to colour and plotted on lcd. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
No doubt it would be *possible* to do get an image from it but what would you do with it after you've got it? You may be able to work with it using the I2C commands in MMBasic. See section 13.3 (page 54) for a flow chart to get an image. It shows you the sections to look up for each step. You should be able to pack an image into a 24-element integer array. (24 rows of 32 bits). Set the device for line scans (not checkerboard). Read subgroup 0 into even numbered elements of the array starting at zero then go back and read subgroup 1 into the odd numbered elements. Now you have a complete picture in the array. What you can do with it in that form is something else. :) BASIC isn't what most people would use to analyze an image for moving objects, for example. A robot doing that would repeatedly bash its arm through objects because it would be too slow. :) However, if you take images into two arrays alternately and compare them you could detect movement (but no detail, only that something has moved). MATH M_PRINT would display the picture for you, I think. This thing seems a bit slow. After switch on it can take up to 4 mins to thermally stabilise. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
I saw this Bigclive video of $98 phone with thermal imaging. A thermal imaging camera with same res would cost more. Some bogus ones too that use 8x8 sensor but look better. https://www.youtube.com/watch?v=4002_MqVNfY https://www.ebay.co.uk/itm/354870604394? |
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| JohnS Guru Joined: 18/11/2011 Location: United KingdomPosts: 3804 |
I think (24 rows of 32 bits) should be ... 64 bits :) Probably 12-element instead of 24-element but I don't know where the 24 came from... John |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
You need 32 bits per row of the array. Zero the rest. Even if it comes in as a 64-bit word you have to split it into two array elements or you can't print the picture with MATH_M PRINT as it prints one line per row of the array. There's no point in having it as 12 elements as the picture will make no sense because of the line interleaving. You could load a 12-element array with 64-bit words but you'd then have to split it up into a 24 element 32 bit one. :) From the flow chart in section 10.5 (page 13) it looks like you have to read successive subpages, they aren't actually scanned as interleaved. You seem to have to tell it which subpage to get and it sets the new data flag when it's ready for you, which makes me think that although they are 64 bit words you have to get 32 bits at once. I'll not be investigating these anyway. It's not of much interest to me. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
I thought mmb pico could do something with the sensor but the data sheet is complex but maybe there's a simpler solution in there else I think Mick's correct. My laser ir thermometer was £9 with its display and the laser so cheap but great for checking components sometimes, but a picture says a thousand words so seeing all hot spots would be nicer. I could not justify the cost of a "real" ir imaging camera. |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6798 |
Just stick a wet finger on the heatsink or chip: No effect - it's safe. Spit boils off - very risky. Manufacturer's logo burned into finger tip - probably too late to worry about the silicon. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| zeitfest Guru Joined: 31/07/2019 Location: AustraliaPosts: 482 |
24x32 ir sensor |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 831 |
I used the MLX90640 with this code on an Odroid-Go.  Frank |
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