I hooked up a GP2D12 Sharp distance sensor to my Arduino. It definately works cause I'm getting readings somehow related to the distance of anything I put in fromt of it.
However the readings I'm getting are not quite what I expected. So far I've gotten readings from 0 to 543. According to the info I have found on calibrating I'm not supposed to be getting readings much less than 100? See this for instance:
I also found the following function for calculating the range. According to this any value below 3 is INVALID? I'm getting 0 - 2 quite often whenever nothing is in front of it.
www.arduino.cc/playground/Main/ReadGp2d12Range
Here are some raw readings and their corresponsing "range" using the mentioned function:
Raw: 23 Range: 335.35
Raw: 11 Range: 844.38
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 9 Range: 1127.17
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 0 Range: -1.00
Raw: 31 Range: 238.39
Raw: 9 Range: 1127.17
Raw: 13 Range: 674.70
Raw: 3 Range: 0.00
Raw: 4 Range: 6783.00
Raw: 7 Range: 1692.75
Raw: 7 Range: 1692.75
Raw: 7 Range: 1692.75
Raw: 0 Range: -1.00
Raw: 23 Range: 335.35
Raw: 3 Range: 0.00
Raw: 6 Range: 2258.33
Raw: 4 Range: 6783.00
Raw: 10 Range: 965.57
Raw: 3 Range: 0.00
Raw: 5 Range: 3389.50
Raw: 3 Range: 0.00
Raw: 0 Range: -1.00
Raw: 15 Range: 561.58
Raw: 10 Range: 965.57
Raw: 11 Range: 844.38
Raw: 6 Range: 2258.33
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 5 Range: 3389.50
Raw: 0 Range: -1.00
Raw: 263 Range: 22.10
Raw: 310 Range: 18.11
Raw: 330 Range: 16.76
Raw: 370 Range: 14.49
Raw: 428 Range: 11.97
Raw: 499 Range: 9.68
Raw: 482 Range: 10.17
Raw: 441 Range: 11.50
Raw: 405 Range: 12.88
Raw: 363 Range: 14.85
Raw: 352 Range: 15.45
Raw: 308 Range: 18.25
Raw: 359 Range: 15.06
Raw: 387 Range: 13.67
Raw: 494 Range: 9.82
Raw: 498 Range: 9.71
Raw: 471 Range: 10.50
Raw: 494 Range: 9.82
Raw: 490 Range: 9.94
Raw: 475 Range: 10.38
Raw: 431 Range: 11.86
Raw: 450 Range: 11.18
Raw: 487 Range: 10.02
Raw: 502 Range: 9.60
Raw: 476 Range: 10.35
Raw: 485 Range: 10.08
Raw: 459 Range: 10.88
Raw: 464 Range: 10.72
Raw: 486 Range: 10.05
Raw: 396 Range: 13.27
Raw: 342 Range: 16.02
Raw: 368 Range: 14.59
Raw: 410 Range: 12.68
Raw: 407 Range: 12.80
Raw: 449 Range: 11.22
Raw: 391 Range: 13.49
Raw: 459 Range: 10.88
Raw: 485 Range: 10.08
Raw: 382 Range: 13.91
Raw: 387 Range: 13.67
Raw: 383 Range: 13.86
Raw: 380 Range: 14.00
Raw: 371 Range: 14.44
Raw: 393 Range: 13.40
Raw: 384 Range: 13.81
Raw: 432 Range: 11.82
Raw: 463 Range: 10.75
Raw: 512 Range: 9.33
Raw: 509 Range: 9.41
Raw: 492 Range: 9.88
Raw: 501 Range: 9.63
Raw: 462 Range: 10.79
Raw: 446 Range: 11.32
Raw: 496 Range: 9.77
Raw: 507 Range: 9.47
Raw: 477 Range: 10.32
Raw: 506 Range: 9.49
Raw: 535 Range: 8.76
Raw: 521 Range: 9.10
Raw: 521 Range: 9.10
Raw: 455 Range: 11.02
Raw: 380 Range: 14.00
Raw: 335 Range: 16.44
Raw: 240 Range: 24.64
Raw: 2 Range: -1.00
Raw: 3 Range: 0.00
Raw: 0 Range: -1.00
Raw: 23 Range: 335.35
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 0 Range: -1.00
Raw: 7 Range: 1692.75
Raw: 5 Range: 3389.50
Raw: 4 Range: 6783.00
Raw: 3 Range: 0.00
Raw: 3 Range: 0.00
Raw: 8 Range: 1353.40
Raw: 3 Range: 0.00
Raw: 4 Range: 6783.00
Raw: 2 Range: -1.00
Raw: 25 Range: 304.50
Raw: 4 Range: 6783.00
Raw: 3 Range: 0.00
Does anyone have a clue as to what is going on?