Difficulty

Moderate

Steps

3

Time Required

                          5 hours

Sections

1

  • mirror moving system
  • 3 steps

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  • BackHitachi ED-A101

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Introduction

We tried to repair the gears (it is not easy to replace the gearbox), we even printed that gear, but it did not work for too long. So we tought of solving this problem in a different way: fix the mirror and simulate the opening/closing process for the projector.

What you need

Step 1

              Limit switches
  • There are two limit switches on the axe of the mirror reporting the opening and the closing of the mirror to the projector’s processor (shown with our cables soldered to it).

There are two limit switches on the axe of the mirror reporting the opening and the closing of the mirror to the projector’s processor (shown with our cables soldered to it).

1024

Step 2

              Motor and cooling fan output
  • Also, the DC motor’s and the cooling fan’s output pins are marked on this image.
  • The cooling fan output is used to power the Arduino: it outputs 7-12V depending on the cooling needed. Although Arduino Pro Micro has a RAW input which should handle this range, it turned out that it is too much for it. So we connected the cooling fan’s output to Arduino’s RAW input through a voltage regulator, which outputs 5.25V.
  • The DC motor output is used to detect when the projector tries to open or close the mirror: it outputs 12V and changes the sides of the + and - depending on the direction. We connected the two diode-protected stepdown converters’ input to the red and black cables of the DC motor output, and the converters’ output to the input pins of the Arduino.

Also, the DC motor’s and the cooling fan’s output pins are marked on this image.

The cooling fan output is used to power the Arduino: it outputs 7-12V depending on the cooling needed. Although Arduino Pro Micro has a RAW input which should handle this range, it turned out that it is too much for it. So we connected the cooling fan’s output to Arduino’s RAW input through a voltage regulator, which outputs 5.25V.

The DC motor output is used to detect when the projector tries to open or close the mirror: it outputs 12V and changes the sides of the + and - depending on the direction. We connected the two diode-protected stepdown converters’ input to the red and black cables of the DC motor output, and the converters’ output to the input pins of the Arduino.

Step 3

  • Circuit diagram

Circuit diagram

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guide.pdf

PDF - 103.99 kb

Author

                                      with 1 other contributor 


                    Geza Makay

Member since: 11/17/2018

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