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I have a couple of i2c devices that I can't get working.  One is a compass module and the other a display.  I am running Robtillards I2c scanner, and it never finishes.  How long does it take to scan the addresses, and when would I conclude that there is either something wrong with the hardware I am using?

Will it tell me when it has reached the end of the possible addresses?
« Last Edit: April 19, 2014, 10:27:38 am by Northof49 » Logged

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Thanks for using my I2C scanner.  First question which version do you use?

The last version should show a menu and when started generate output instantaneously and be ready within a short time.
(seconds)

If you have nothing connected does produce any output?

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Can you point me towards your latest version?  I have a heck of a time finding specific tools or resources on this web site.

I found 0.1.03 version. 

The message comes up, I enter an S or C in the top of the serial monitor, and it produces a table header.  No results though.  I wonder if my problem is voltage or pull up resistors?  I have tried 1K and 2K and 100K resistors.  I have only run the compass module at 3.3 as that is the rated voltage.  I tried the LCD at 3.3 and 5 volts.  At 5v the screen lcd shows indication.  At 3.3 it shows nothing.
« Last Edit: April 19, 2014, 11:34:56 am by Northof49 » Logged

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find attached the 0.1.03 version

* MultiSpeedI2CScanner.zip (1.53 KB - downloaded 7 times.)
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Thank you.  Any idea of the typical time for completion of a scan?  Does it indicate when it is finished and found nothing?  Or started and found nothing?
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Single scan:   0 devices found in 323 milliseconds.  See log below.

Note to start the scanning you must send an 's' to the Arduino (do not forget the return to actually send it)

Code: (sample run)
Arduino I2C Scanner - 0.1.03

s = single scan
c = continuous scan - 1 second delay
q = quit continuous scan
d = toggle latency delay between successful tests.
p = toggle printAll - printFound.
h = toggle header - noHeader.
? = help - this page

TIME DEC HEX 50 100 200 250 400 500 800 [KHz]
------------------------------------------------------------------------------------------------
5323 0 0x0 . . . . . . .
5325 1 0x1 . . . . . . .
5327 2 0x2 . . . . . . .
5330 3 0x3 . . . . . . .
5332 4 0x4 . . . . . . .
5335 5 0x5 . . . . . . .
5337 6 0x6 . . . . . . .
5340 7 0x7 . . . . . . .
5342 8 0x8 . . . . . . .
5344 9 0x9 . . . . . . .
5346 10 0xA . . . . . . .
5349 11 0xB . . . . . . .
5351 12 0xC . . . . . . .
5353 13 0xD . . . . . . .
5356 14 0xE . . . . . . .
5358 15 0xF . . . . . . .
5360 16 0x10 . . . . . . .
5363 17 0x11 . . . . . . .
5365 18 0x12 . . . . . . .
5368 19 0x13 . . . . . . .
5370 20 0x14 . . . . . . .
5372 21 0x15 . . . . . . .
5376 22 0x16 . . . . . . .
5378 23 0x17 . . . . . . .
5381 24 0x18 . . . . . . .
5383 25 0x19 . . . . . . .
5385 26 0x1A . . . . . . .
5388 27 0x1B . . . . . . .
5390 28 0x1C . . . . . . .
5393 29 0x1D . . . . . . .
5395 30 0x1E . . . . . . .
5397 31 0x1F . . . . . . .
5400 32 0x20 . . . . . . .
5402 33 0x21 . . . . . . .
5405 34 0x22 . . . . . . .
5407 35 0x23 . . . . . . .
5410 36 0x24 . . . . . . .
5412 37 0x25 . . . . . . .
5414 38 0x26 . . . . . . .
5417 39 0x27 . . . . . . .
5420 40 0x28 . . . . . . .
5423 41 0x29 . . . . . . .
5425 42 0x2A . . . . . . .
5427 43 0x2B . . . . . . .
5430 44 0x2C . . . . . . .
5432 45 0x2D . . . . . . .
5435 46 0x2E . . . . . . .
5437 47 0x2F . . . . . . .
5439 48 0x30 . . . . . . .
5442 49 0x31 . . . . . . .
5444 50 0x32 . . . . . . .
5447 51 0x33 . . . . . . .
5449 52 0x34 . . . . . . .
5451 53 0x35 . . . . . . .
5454 54 0x36 . . . . . . .
5456 55 0x37 . . . . . . .
5459 56 0x38 . . . . . . .
5462 57 0x39 . . . . . . .
5464 58 0x3A . . . . . . .
5467 59 0x3B . . . . . . .
5469 60 0x3C . . . . . . .
5472 61 0x3D . . . . . . .
5474 62 0x3E . . . . . . .
5477 63 0x3F . . . . . . .
5479 64 0x40 . . . . . . .
5481 65 0x41 . . . . . . .
5484 66 0x42 . . . . . . .
5486 67 0x43 . . . . . . .
5489 68 0x44 . . . . . . .
5491 69 0x45 . . . . . . .
5493 70 0x46 . . . . . . .
5496 71 0x47 . . . . . . .
5498 72 0x48 . . . . . . .
5501 73 0x49 . . . . . . .
5504 74 0x4A . . . . . . .
5506 75 0x4B . . . . . . .
5509 76 0x4C . . . . . . .
5511 77 0x4D . . . . . . .
5514 78 0x4E . . . . . . .
5516 79 0x4F . . . . . . .
5518 80 0x50 . . . . . . .
5521 81 0x51 . . . . . . .
5523 82 0x52 . . . . . . .
5526 83 0x53 . . . . . . .
5528 84 0x54 . . . . . . .
5530 85 0x55 . . . . . . .
5533 86 0x56 . . . . . . .
5535 87 0x57 . . . . . . .
5538 88 0x58 . . . . . . .
5540 89 0x59 . . . . . . .
5543 90 0x5A . . . . . . .
5545 91 0x5B . . . . . . .
5548 92 0x5C . . . . . . .
5551 93 0x5D . . . . . . .
5553 94 0x5E . . . . . . .
5556 95 0x5F . . . . . . .
5558 96 0x60 . . . . . . .
5560 97 0x61 . . . . . . .
5563 98 0x62 . . . . . . .
5565 99 0x63 . . . . . . .
5568 100 0x64 . . . . . . .
5570 101 0x65 . . . . . . .
5573 102 0x66 . . . . . . .
5575 103 0x67 . . . . . . .
5578 104 0x68 . . . . . . .
5580 105 0x69 . . . . . . .
5583 106 0x6A . . . . . . .
5585 107 0x6B . . . . . . .
5587 108 0x6C . . . . . . .
5591 109 0x6D . . . . . . .
5593 110 0x6E . . . . . . .
5596 111 0x6F . . . . . . .
5598 112 0x70 . . . . . . .
5601 113 0x71 . . . . . . .
5603 114 0x72 . . . . . . .
5606 115 0x73 . . . . . . .
5608 116 0x74 . . . . . . .
5611 117 0x75 . . . . . . .
5613 118 0x76 . . . . . . .
5616 119 0x77 . . . . . . .
5618 120 0x78 . . . . . . .
5621 121 0x79 . . . . . . .
5623 122 0x7A . . . . . . .
5626 123 0x7B . . . . . . .
5628 124 0x7C . . . . . . .
5632 125 0x7D . . . . . . .
5634 126 0x7E . . . . . . .
5637 127 0x7F . . . . . . .

0 devices found in 323 milliseconds.

Arduino I2C Scanner - 0.1.03

s = single scan
c = continuous scan - 1 second delay
q = quit continuous scan
d = toggle latency delay between successful tests.
p = toggle printAll - printFound.
h = toggle header - noHeader.
? = help - this page

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I am getting nothing with either continuous or single scan, from either device.  I am running a Mega 2560 R3.  I suspect there is some problem with the hardware.  Perhaps pull up resistor values, either internal or external.
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I know there are/were problems with the DUE and I2C but I do not recall any problem with the MEGA.

Do you have an UNO around?
Give that a try, with and without connected devices?
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The program never reaches a conclusion.  After printing the header, that's it.

Doesn't say "0 devices found" or even print the time, dec and hex values you show in your example.  Why would that be?

If I run the program with an oscilloscope hooked up to SDA, I should see some output.  Is that worth trying, in order to see if anything is going out?
« Last Edit: April 19, 2014, 04:27:40 pm by Northof49 » Logged

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Hooked a scope up to SCL and SDA.  Sits at plus 5v when the program isn't running.  That is with no added external pull up resistors.   Once I start your program, both are producing a 5v DC square wave.  Not a lot of difference seen in the output between when I attach 2k pull up resistors as it was already pulled up and down cleanly.  Still moves down to zero and up to +5v cleanly without.   I can see the frequency steps the program produces.  Looks like the mega does work.  So its either my software (wire program?) or the actual i2c devices.  Wish I had one I knew worked.
« Last Edit: April 19, 2014, 07:29:05 pm by Northof49 » Logged

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I digged up an MEGA (also R3) and ran my I2C scanner (nothing connected) and it worked smooth / did not block.

Code:
Arduino I2C Scanner - 0.1.03

s = single scan
c = continuous scan - 1 second delay
q = quit continuous scan
d = toggle latency delay between successful tests.
p = toggle printAll - printFound.
h = toggle header - noHeader.
? = help - this page

TIME DEC HEX 50 100 200 250 400 500 800 [KHz]
------------------------------------------------------------------------------------------------
2689 0 0x0 . . . . . . .
2691 1 0x1 . . . . . . .
2693 2 0x2 . . . . . . .
2695 3 0x3 . . . . . . .
2698 4 0x4 . . . . . . .
2700 5 0x5 . . . . . . .
2702 6 0x6 . . . . . . .
2704 7 0x7 . . . . . . .
2707 8 0x8 . . . . . . .
2709 9 0x9 . . . . . . .
2711 10 0xA . . . . . . .
2713 11 0xB . . . . . . .
2716 12 0xC . . . . . . .
2718 13 0xD . . . . . . .
2720 14 0xE . . . . . . .
2723 15 0xF . . . . . . .
2725 16 0x10 . . . . . . .
2727 17 0x11 . . . . . . .
2731 18 0x12 . . . . . . .
2733 19 0x13 . . . . . . .
2736 20 0x14 . . . . . . .
2738 21 0x15 . . . . . . .
2740 22 0x16 . . . . . . .
2743 23 0x17 . . . . . . .
2745 24 0x18 . . . . . . .
2748 25 0x19 . . . . . . .
2750 26 0x1A . . . . . . .
2752 27 0x1B . . . . . . .
2755 28 0x1C . . . . . . .
2757 29 0x1D . . . . . . .
2760 30 0x1E . . . . . . .
2762 31 0x1F . . . . . . .
2764 32 0x20 . . . . . . .
2767 33 0x21 . . . . . . .
2769 34 0x22 . . . . . . .
2772 35 0x23 . . . . . . .
2775 36 0x24 . . . . . . .
2778 37 0x25 . . . . . . .
2780 38 0x26 . . . . . . .
2782 39 0x27 . . . . . . .
2785 40 0x28 . . . . . . .
2787 41 0x29 . . . . . . .
2790 42 0x2A . . . . . . .
2792 43 0x2B . . . . . . .
2794 44 0x2C . . . . . . .
2797 45 0x2D . . . . . . .
2799 46 0x2E . . . . . . .
2802 47 0x2F . . . . . . .
2804 48 0x30 . . . . . . .
2806 49 0x31 . . . . . . .
2809 50 0x32 . . . . . . .
2811 51 0x33 . . . . . . .
2814 52 0x34 . . . . . . .
2817 53 0x35 . . . . . . .
2819 54 0x36 . . . . . . .
2822 55 0x37 . . . . . . .
2824 56 0x38 . . . . . . .
2827 57 0x39 . . . . . . .
2829 58 0x3A . . . . . . .
2831 59 0x3B . . . . . . .
2834 60 0x3C . . . . . . .
2836 61 0x3D . . . . . . .
2839 62 0x3E . . . . . . .
2841 63 0x3F . . . . . . .
2843 64 0x40 . . . . . . .
2846 65 0x41 . . . . . . .
2848 66 0x42 . . . . . . .
2851 67 0x43 . . . . . . .
2853 68 0x44 . . . . . . .
2856 69 0x45 . . . . . . .
2859 70 0x46 . . . . . . .
2861 71 0x47 . . . . . . .
2864 72 0x48 . . . . . . .
2866 73 0x49 . . . . . . .
2869 74 0x4A . . . . . . .
2871 75 0x4B . . . . . . .
2873 76 0x4C . . . . . . .
2876 77 0x4D . . . . . . .
2878 78 0x4E . . . . . . .
2881 79 0x4F . . . . . . .
2883 80 0x50 . . . . . . .
2885 81 0x51 . . . . . . .
2888 82 0x52 . . . . . . .
2890 83 0x53 . . . . . . .
2893 84 0x54 . . . . . . .
2895 85 0x55 . . . . . . .
2897 86 0x56 . . . . . . .
2900 87 0x57 . . . . . . .
2903 88 0x58 . . . . . . .
2906 89 0x59 . . . . . . .
2908 90 0x5A . . . . . . .
2910 91 0x5B . . . . . . .
2913 92 0x5C . . . . . . .
2915 93 0x5D . . . . . . .
2918 94 0x5E . . . . . . .
2920 95 0x5F . . . . . . .
2923 96 0x60 . . . . . . .
2925 97 0x61 . . . . . . .
2927 98 0x62 . . . . . . .
2930 99 0x63 . . . . . . .
2932 100 0x64 . . . . . . .
2935 101 0x65 . . . . . . .
2937 102 0x66 . . . . . . .
2940 103 0x67 . . . . . . .
2942 104 0x68 . . . . . . .
2946 105 0x69 . . . . . . .
2948 106 0x6A . . . . . . .
2951 107 0x6B . . . . . . .
2953 108 0x6C . . . . . . .
2956 109 0x6D . . . . . . .
2958 110 0x6E . . . . . . .
2961 111 0x6F . . . . . . .
2963 112 0x70 . . . . . . .
2966 113 0x71 . . . . . . .
2968 114 0x72 . . . . . . .
2971 115 0x73 . . . . . . .
2973 116 0x74 . . . . . . .
2975 117 0x75 . . . . . . .
2978 118 0x76 . . . . . . .
2980 119 0x77 . . . . . . .
2983 120 0x78 . . . . . . .
2985 121 0x79 . . . . . . .
2989 122 0x7A . . . . . . .
2991 123 0x7B . . . . . . .
2994 124 0x7C . . . . . . .
2996 125 0x7D . . . . . . .
2999 126 0x7E . . . . . . .
3001 127 0x7F . . . . . . .

0 devices found in 323 milliseconds.

Arduino I2C Scanner - 0.1.03

s = single scan
c = continuous scan - 1 second delay
q = quit continuous scan
d = toggle latency delay between successful tests.
p = toggle printAll - printFound.
h = toggle header - noHeader.
? = help - this page

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You can try other I2C scanners see if they have the same issue - http://playground.arduino.cc/Main/I2cScanner -
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