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melexis / mlx90640-library

MLX90640 library functions
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I2C read problem #45

Closed vthielen closed 4 years ago

vthielen commented 5 years ago

I am trying to read back the image data from the MLX90640 to an MSP430 TI MCU over I2C The problem that I have is that the chip always replies the same data, even after resetting it (although I should be reading from RAM) Even when I change the readback address, the data is always the same. Therefore, I think the chip doesn't get the readback address, en responds with a page from its ROM. Can somebody have a look at the traces in attachment? Might the problem be that there is a stop condition after the requested address, instead of restart? readback detail

slavysis commented 5 years ago

Indeed the problem is that instead of a 'Repeated start' condition the MCU is transmitting a 'Stop' condition. The MLX90640 terminates the communication after the stop condition and does not fetch the initial read address. If your library does not support 'repeated start', you could try using the software implementation of the I2C.

vthielen commented 5 years ago

Hello Slaveyko,

Thanks for the reply! I am using a restart now, and I am getting data that seems to respond to the image now (values go up if I put my hand over it) But the data I get back seems strange to me: MSByte is 0xFF everywhere (see image below), and only LSB has data dat responds to the image. Does this have something to do with the checkerboard pattern? Or do I have to turn the gain of the chip down?

Kind regards,

Bart

[image: afbeelding.png]

Op do 31 okt. 2019 om 12:09 schreef Slaveyko notifications@github.com:

Indeed the problem is that instead of a 'Repeated start' condition the MCU is transmitting a 'Stop' condition. The MLX90640 terminates the communication after the stop condition and does not fetch the initial read address. If your library does not support 'repeated start', you could try using the software implementation of the I2C.

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slavysis commented 5 years ago

The data is 2's complement, so having FF in the MS byte simply means that the data is negative. At higher object temperatures the signal will become positive.

Best regards

vthielen commented 4 years ago

Hello Slaveyko,

I contacted you a while ago because I had problems reading out the MLX90640 chip. The readout is now ok, but I have a problem with the temperature values that I get: they are about 20 deg too low: I used it on my hand (37 degrees) in the data below, and get values of about 18 degrees. Also, if I use the GetImage routine, I still see a residual checkerboard pattern (see attachment) after combining both subframes, suggesting to me that the two subframes are not equal.

Could this have anything to do with the settings in the control register? I am using 0x191D to get subpage 1 and 0x190D to get subpage 0, after which I write 0x0010 to the status register, but I have the impression that this means the camera only takes one image (instead of continuous), and therefore doesn't reach a good working temperature? (I read back 28 degrees)

At the bottom of this email I included the data from the temperature calculation, generated by inserting two printf's before and after the line that calculates the final temperature as shown below:

printf("pix%i To=%f ",pixelNumber,To); To = sqrt(sqrt(irData / (alphaCompensated alphaCorrR[range] (1 + params->ksTo[range] * (To - params->ct[range]))) + taTr)) - 273.15; printf("IRdata=%f alphaCompensated=%f alphaCorrR=%f To=%f range=%i ksTo=%f ct=%f\n",irData,alphaCompensated,alphaCorrR[range],To,range,params->ksTo[range],params->ct[range]);

[image: afbeelding.png]

irDataCP:-45.675446 -50.232594 gain:0.998309 alphaCorrR:1.008076 1.000000 0.939919 0.902271 taTr:8391447552.000000 alphascale:2048.000000 vdd:3.554232 ta:27.945938 tr:-8.000000 emissivity:0.950000

pix0 To=11.706423 IRdata=-63.010338 alphaCompensated=0.000000 alphaCorrR=1.000000 To=11.706601 range=1 ksTo=-0.000200 ct=0.902270 pix2 To=13.226405 IRdata=-63.429398 alphaCompensated=0.000000 alphaCorrR=1.000000 To=13.226575 range=1 ksTo=-0.000200 ct=0.902270 pix4 To=15.732354 IRdata=-59.086304 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.732493 range=1 ksTo=-0.000200 ct=0.902270 pix6 To=16.579142 IRdata=-58.314812 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.579271 range=1 ksTo=-0.000200 ct=0.902270 pix8 To=18.003624 IRdata=-55.162258 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.003731 range=1 ksTo=-0.000200 ct=0.902270 pix10 To=18.554527 IRdata=-54.251087 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.554626 range=1 ksTo=-0.000200 ct=0.902270 pix12 To=19.054195 IRdata=-53.168243 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.054289 range=1 ksTo=-0.000200 ct=0.902270 pix14 To=19.532085 IRdata=-51.098534 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.532169 range=1 ksTo=-0.000200 ct=0.902270 pix16 To=19.250906 IRdata=-52.467487 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.250994 range=1 ksTo=-0.000200 ct=0.902270 pix18 To=18.880327 IRdata=-53.235611 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.880423 range=1 ksTo=-0.000200 ct=0.902270 pix20 To=18.800734 IRdata=-54.390774 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.800831 range=1 ksTo=-0.000200 ct=0.902270 pix22 To=18.423588 IRdata=-52.988235 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.423691 range=1 ksTo=-0.000200 ct=0.902270 pix24 To=17.791426 IRdata=-54.569183 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.791536 range=1 ksTo=-0.000200 ct=0.902270 pix26 To=16.138138 IRdata=-57.297649 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.138269 range=1 ksTo=-0.000200 ct=0.902270 pix28 To=15.686981 IRdata=-57.124283 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.687119 range=1 ksTo=-0.000200 ct=0.902270 pix30 To=13.199301 IRdata=-60.450211 alphaCompensated=0.000000 alphaCorrR=1.000000 To=13.199468 range=1 ksTo=-0.000200 ct=0.902270 pix33 To=12.220643 IRdata=-65.398674 alphaCompensated=0.000000 alphaCorrR=1.000000 To=12.220819 range=1 ksTo=-0.000200 ct=0.902270 pix35 To=14.382569 IRdata=-60.509827 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.382729 range=1 ksTo=-0.000200 ct=0.902270 pix37 To=15.709999 IRdata=-61.316479 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.710138 range=1 ksTo=-0.000200 ct=0.902270 pix39 To=16.872572 IRdata=-58.285255 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.872696 range=1 ksTo=-0.000200 ct=0.902270 pix41 To=17.716986 IRdata=-58.163914 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.717094 range=1 ksTo=-0.000200 ct=0.902270 pix43 To=18.618486 IRdata=-54.081844 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.618586 range=1 ksTo=-0.000200 ct=0.902270 pix45 To=19.073660 IRdata=-53.960518 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.073751 range=1 ksTo=-0.000200 ct=0.902270 pix47 To=19.665548 IRdata=-50.806427 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.665632 range=1 ksTo=-0.000200 ct=0.902270 pix49 To=19.386871 IRdata=-52.788460 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.386959 range=1 ksTo=-0.000200 ct=0.902270 pix51 To=19.002533 IRdata=-52.908127 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.002626 range=1 ksTo=-0.000200 ct=0.902270 pix53 To=18.556519 IRdata=-55.698597 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.556618 range=1 ksTo=-0.000200 ct=0.902270 pix55 To=18.438505 IRdata=-53.590385 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.438606 range=1 ksTo=-0.000200 ct=0.902270 pix57 To=17.415831 IRdata=-56.507030 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.415947 range=1 ksTo=-0.000200 ct=0.902270 pix59 To=16.599066 IRdata=-56.374340 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.599195 range=1 ksTo=-0.000200 ct=0.902270 pix61 To=15.063366 IRdata=-60.209148 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.063513 range=1 ksTo=-0.000200 ct=0.902270 pix63 To=13.629465 IRdata=-58.789711 alphaCompensated=0.000000 alphaCorrR=1.000000 To=13.629629 range=1 ksTo=-0.000200 ct=0.902270 pix64 To=12.263007 IRdata=-65.251717 alphaCompensated=0.000000 alphaCorrR=1.000000 To=12.263182 range=1 ksTo=-0.000200 ct=0.902270 pix66 To=13.947654 IRdata=-64.512253 alphaCompensated=0.000000 alphaCorrR=1.000000 To=13.947814 range=1 ksTo=-0.000200 ct=0.902270 pix68 To=16.546108 IRdata=-58.454498 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.546236 range=1 ksTo=-0.000200 ct=0.902270 pix70 To=16.671015 IRdata=-60.695881 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.671141 range=1 ksTo=-0.000200 ct=0.902270 pix72 To=18.286781 IRdata=-57.403641 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.286884 range=1 ksTo=-0.000200 ct=0.902270 pix74 To=18.627428 IRdata=-55.620041 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.627531 range=1 ksTo=-0.000200 ct=0.902270 pix76 To=19.807325 IRdata=-53.060551 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.807405 range=1 ksTo=-0.000200 ct=0.902270 pix78 To=19.743071 IRdata=-52.326118 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.743158 range=1 ksTo=-0.000200 ct=0.902270 pix80 To=19.826172 IRdata=-52.608849 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.826256 range=1 ksTo=-0.000200 ct=0.902270 pix82 To=18.941593 IRdata=-56.529522 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.941689 range=1 ksTo=-0.000200 ct=0.902270 pix84 To=19.306213 IRdata=-54.427826 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.306305 range=1 ksTo=-0.000200 ct=0.902270 pix86 To=18.419649 IRdata=-56.492477 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.419750 range=1 ksTo=-0.000200 ct=0.902270 pix88 To=17.886395 IRdata=-56.953621 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.886505 range=1 ksTo=-0.000200 ct=0.902270 pix90 To=17.067730 IRdata=-57.439014 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.067852 range=1 ksTo=-0.000200 ct=0.902270 pix92 To=15.913602 IRdata=-60.308838 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.913740 range=1 ksTo=-0.000200 ct=0.902270 pix94 To=14.446754 IRdata=-60.450211 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.446907 range=1 ksTo=-0.000200 ct=0.902270 pix97 To=12.950015 IRdata=-65.395493 alphaCompensated=0.000000 alphaCorrR=1.000000 To=12.950187 range=1 ksTo=-0.000200 ct=0.902270 pix99 To=14.935462 IRdata=-62.611538 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.935610 range=1 ksTo=-0.000200 ct=0.902270 pix101 To=15.917341 IRdata=-63.539383 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.917476 range=1 ksTo=-0.000200 ct=0.902270 pix103 To=17.675764 IRdata=-57.357281 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.675875 range=1 ksTo=-0.000200 ct=0.902270 pix105 To=18.513962 IRdata=-57.234272 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.514061 range=1 ksTo=-0.000200 ct=0.902270 pix107 To=18.832720 IRdata=-56.306431 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.832813 range=1 ksTo=-0.000200 ct=0.902270 pix109 To=19.372370 IRdata=-56.062218 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.372458 range=1 ksTo=-0.000200 ct=0.902270 pix111 To=20.265148 IRdata=-49.878448 alphaCompensated=0.000000 alphaCorrR=1.000000 To=20.265223 range=1 ksTo=-0.000200 ct=0.902270 pix113 To=19.771637 IRdata=-53.839310 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.771723 range=1 ksTo=-0.000200 ct=0.902270 pix115 To=19.834856 IRdata=-51.857277 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.834938 range=1 ksTo=-0.000200 ct=0.902270 pix117 To=19.263494 IRdata=-54.768944 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.263588 range=1 ksTo=-0.000200 ct=0.902270 pix119 To=19.020346 IRdata=-53.713257 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.020443 range=1 ksTo=-0.000200 ct=0.902270 pix121 To=17.938917 IRdata=-57.548061 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.939028 range=1 ksTo=-0.000200 ct=0.902270 pix123 To=17.384893 IRdata=-56.497211 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.385012 range=1 ksTo=-0.000200 ct=0.902270 pix125 To=15.683915 IRdata=-61.259995 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.684054 range=1 ksTo=-0.000200 ct=0.902270 pix127 To=14.457007 IRdata=-60.768539 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.457163 range=1 ksTo=-0.000200 ct=0.902270 pix128 To=12.918764 IRdata=-65.704468 alphaCompensated=0.000000 alphaCorrR=1.000000 To=12.918933 range=1 ksTo=-0.000200 ct=0.902270 pix130 To=14.214037 IRdata=-65.845818 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.214195 range=1 ksTo=-0.000200 ct=0.902270 pix132 To=16.642870 IRdata=-61.746738 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.642996 range=1 ksTo=-0.000200 ct=0.902270 pix134 To=17.514652 IRdata=-59.682076 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.514765 range=1 ksTo=-0.000200 ct=0.902270 pix136 To=18.706497 IRdata=-57.721741 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.706596 range=1 ksTo=-0.000200 ct=0.902270 pix138 To=19.145260 IRdata=-55.620041 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.145351 range=1 ksTo=-0.000200 ct=0.902270 pix140 To=19.919579 IRdata=-53.758972 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.919662 range=1 ksTo=-0.000200 ct=0.902270 pix142 To=19.357660 IRdata=-56.632153 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.357750 range=1 ksTo=-0.000200 ct=0.902270 pix144 To=19.799282 IRdata=-54.993279 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.799362 range=1 ksTo=-0.000200 ct=0.902270 pix146 To=19.208847 IRdata=-56.670891 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.208939 range=1 ksTo=-0.000200 ct=0.902270 pix148 To=19.406227 IRdata=-55.761402 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.406315 range=1 ksTo=-0.000200 ct=0.902270 pix150 To=18.779760 IRdata=-55.662128 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.779858 range=1 ksTo=-0.000200 ct=0.902270 pix152 To=18.621546 IRdata=-56.044136 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.621647 range=1 ksTo=-0.000200 ct=0.902270 pix154 To=17.293903 IRdata=-59.540718 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.294022 range=1 ksTo=-0.000200 ct=0.902270 pix156 To=16.745651 IRdata=-59.293343 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.745775 range=1 ksTo=-0.000200 ct=0.902270 pix158 To=14.381015 IRdata=-63.744122 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.381173 range=1 ksTo=-0.000200 ct=0.902270 pix161 To=13.638536 IRdata=-66.446342 alphaCompensated=0.000000 alphaCorrR=1.000000 To=13.638702 range=1 ksTo=-0.000200 ct=0.902270 pix163 To=15.266004 IRdata=-63.662388 alphaCompensated=0.000000 alphaCorrR=1.000000 To=15.266150 range=1 ksTo=-0.000200 ct=0.902270 pix165 To=16.264973 IRdata=-64.711441 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.265102 range=1 ksTo=-0.000200 ct=0.902270 pix167 To=17.627342 IRdata=-59.581844 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.627453 range=1 ksTo=-0.000200 ct=0.902270 pix169 To=18.825293 IRdata=-58.285122 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.825388 range=1 ksTo=-0.000200 ct=0.902270 pix171 To=19.657156 IRdata=-54.081844 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.657240 range=1 ksTo=-0.000200 ct=0.902270 pix173 To=19.383108 IRdata=-57.111538 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.383196 range=1 ksTo=-0.000200 ct=0.902270 pix175 To=20.163612 IRdata=-52.908127 alphaCompensated=0.000000 alphaCorrR=1.000000 To=20.163691 range=1 ksTo=-0.000200 ct=0.902270 pix177 To=19.968761 IRdata=-53.960518 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.968843 range=1 ksTo=-0.000200 ct=0.902270 pix179 To=19.816093 IRdata=-53.958988 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.816177 range=1 ksTo=-0.000200 ct=0.902270 pix181 To=19.441505 IRdata=-55.819790 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.441589 range=1 ksTo=-0.000200 ct=0.902270 pix183 To=19.200935 IRdata=-53.836124 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.201031 range=1 ksTo=-0.000200 ct=0.902270 pix185 To=18.153048 IRdata=-58.598911 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.153152 range=1 ksTo=-0.000200 ct=0.902270 pix187 To=17.408930 IRdata=-58.721779 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.409042 range=1 ksTo=-0.000200 ct=0.902270 pix189 To=16.117546 IRdata=-61.382862 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.117680 range=1 ksTo=-0.000200 ct=0.902270 pix191 To=14.427254 IRdata=-63.921101 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.427410 range=1 ksTo=-0.000200 ct=0.902270 pix192 To=12.406061 IRdata=-71.585480 alphaCompensated=0.000000 alphaCorrR=1.000000 To=12.406236 range=1 ksTo=-0.000200 ct=0.902270 pix194 To=14.359373 IRdata=-68.857010 alphaCompensated=0.000000 alphaCorrR=1.000000 To=14.359529 range=1 ksTo=-0.000200 ct=0.902270 pix196 To=16.589069 IRdata=-64.619926 alphaCompensated=0.000000 alphaCorrR=1.000000 To=16.589197 range=1 ksTo=-0.000200 ct=0.902270 pix198 To=17.760452 IRdata=-61.642426 alphaCompensated=0.000000 alphaCorrR=1.000000 To=17.760565 range=1 ksTo=-0.000200 ct=0.902270 pix200 To=18.790257 IRdata=-59.505348 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.790352 range=1 ksTo=-0.000200 ct=0.902270 pix202 To=18.583246 IRdata=-61.783783 alphaCompensated=0.000000 alphaCorrR=1.000000 To=18.583345 range=1 ksTo=-0.000200 ct=0.902270 pix204 To=19.852291 IRdata=-56.352795 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.852373 range=1 ksTo=-0.000200 ct=0.902270 pix206 To=19.521984 IRdata=-57.580379 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.522070 range=1 ksTo=-0.000200 ct=0.902270 pix208 To=19.627485 IRdata=-57.721741 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.627571 range=1 ksTo=-0.000200 ct=0.902270 pix210 To=19.638632 IRdata=-55.620041 alphaCompensated=0.000000 alphaCorrR=1.000000 To=19.638716 range=1 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IRdata=-100.031609 alphaCompensated=0.000000 alphaCorrR=1.000000 To=10.227593 range=1 ksTo=-0.000200 ct=0.902270 pix755 To=10.240218 IRdata=-96.836060 alphaCompensated=0.000000 alphaCorrR=1.000000 To=10.240406 range=1 ksTo=-0.000200 ct=0.902270 pix757 To=10.479496 IRdata=-93.972252 alphaCompensated=0.000000 alphaCorrR=1.000000 To=10.479685 range=1 ksTo=-0.000200 ct=0.902270 pix759 To=9.828879 IRdata=-93.683510 alphaCompensated=0.000000 alphaCorrR=1.000000 To=9.829068 range=1 ksTo=-0.000200 ct=0.902270 pix761 To=8.431450 IRdata=-99.663010 alphaCompensated=0.000000 alphaCorrR=1.000000 To=8.431639 range=1 ksTo=-0.000200 ct=0.902270 pix763 To=7.620794 IRdata=-97.315567 alphaCompensated=0.000000 alphaCorrR=1.000000 To=7.620979 range=1 ksTo=-0.000200 ct=0.902270 pix765 To=5.690634 IRdata=-101.396118 alphaCompensated=0.000000 alphaCorrR=1.000000 To=5.690798 range=1 ksTo=-0.000200 ct=0.902270 pix767 To=4.710835 IRdata=-95.527527 alphaCompensated=0.000000 alphaCorrR=1.000000 To=4.710990 range=1 ksTo=-0.000200 ct=0.902270

Op wo 13 nov. 2019 om 15:32 schreef Slaveyko notifications@github.com:

The data is 2's complement, so having FF in the MS byte simply means that the data is negative. At higher object temperatures the signal will become positive.

Best regards

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slavysis commented 4 years ago

Indeed, this setting is causing the behavior you observe. If you try using the default setting 0x1901, everything should be working just fine.

Best regards