It's such a pity.... so many products contain really powerful SOCs... but because of the lack of documentation, all we can do is throw them away... we could have some lovely free microcontrollers.... if only....
Great project, you can find more helpful information on [Updated! DIY AFM (Atomic Force Microscope)] Instructable. The article was published by Edwin Hwa. I was able to hack into old DVD burners from vintage PC since the documentation is available for them. Cheers
I'm so amazed at your skills in reverse engineering this DVD player. I'm glad I stumbled across your channel when looking for a DIY microscope. New sub now.
I'm doing this same project. From what I've seen online, the stepper motor isn't precise enough to get fine details, so most people use another VCM for the other axis.
Funny project. You are recreating a measurement system that had been on the market for industrial 3D surface scans more the 25 years ago. Back than optics from a cd-player were used. Accuracy lateral better 1 micron, height better than 0,1 micron.
Did you use the opamps for any particular reason? Could you just hook those inputs to the MCU pins and handle the logic that way? Or is there amplification happening too? I would like to use this method to simply measure small distances with high accuracy
Is there any reason the PDIC could not have been rotated 90° on the threaded rod and stepper motor configuration so that the platform with the specimen does not have to move
Sir, very good job. Can you ask, how can you find A, B, C and D pins of PDIC pins? On my CD/DVD/Blue-ray PDIC has 15 pins, 12 and 14 pins. Can't search any information. Thank you for your time.
Maybe tracing the signals with an oscilloscope while the device is reading a DVD. I was lucky because with my Blu-ray player it was printed on the circuit board.
@@DoctorVolt . thanks for answer. Can you help me - how to identify plus and minus supplying voltage? Itryed your plan, but i dont know, how to connect a power supply(
You have two circuits for this design. On this circuit, you have the positive terminal ( non inverting side ) as b+d and have (a+c) as the negative side on the fes op amp 6:20. On the newer circuit, this is flipped. Was that a mistake?
@DoctorVolt on the new schematic, you have the a+c signal going to the positive terminal listed at number 5 and have b+d going to negative terminal listed as 6 on the mcp6004. On the old circuit, the one shown in this video, you have a+c going to terminal 6 the negative terminal and b+d going to terminal 5 the postive terminal. Isn't the formula for op amps VOUT= A(V+ -V-)? Based on this information, on the old circuit you were doing vout=A( (b+d)-(a+c)) and on the new circuit vout=A((a+c)-(b+d))?
sir, thank you again for your project. I bought the same opu head, built the same scheme and have problem, my pdic has no difference in signal, the preamplifying signalalready 5v. Did your Uref is equal to 5v or its my fault?
@@DoctorVolt thank you for advice. I connect my oscilloscope to powered opu head and without power on 18 pin on 22 -29 pin on plus and 30 pin to ground. Unfortunately, changing the focus distance with mcp6004 and simply connect has shown no difference. Maybe my PDIC signal doesnt change because i cant reach the focus point? Excuse me, but i have no choice or solution, only waiting your advice.
@@qweqwerty7537 the focal point is very close to the lens. Somewhere between 0.5 and 1 mm, and it is only a few micrometers wide. It is best to try it with a piece of aluminum foil, as I showed in part 1.
