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Public Lab Research note

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Quick Build: Raspberry Pi Microscope

by partsandcrafts with bmela , kgradow1 , wmacfarl |

partsandcrafts was awarded the Photo Documentation Barnstar by stevie for their work in this research note.

Quick build instructions for Hackteria Remix Raspberry Pi Microscope

Materialsimage descriptionimage description

Mount the Camera

  1. Attach 3D printed camera holder to baseplate using M3 bolts(16mm)image description
  2. Attach camera to holder (NOTE: These M3 bolts were too large and I had to drill out the camera mounting holes -- should get smaller bolts for future versions)image description
  3. Attach optics mount to camera bottom image description

Build the Stand

  1. Attach back-holder to baseplateimage description
  2. Attach back to back-holder with slide (20mm bolts + washers) so it can slide but stays in place image description
  3. Screw in objective to set table height. Objective tip should be at roughly the same height as top of table. You can get this precisely with combination of slide and notch height. image description
  4. Attach table image description
  5. Add feet -- feet elevate above screws and dampen vibration image description

Attach the Camera

  1. Plug ribbon into camera image description
  2. Plug ribbon into piimage description
  3. Connect the pi to laptop via USB to provide power image description

Attach the Focus Bolt

  1. The carriage bolt acts as a lead screw. Rotate it through the hole and screw it down until it touches the base plateimage description
  2. Hold sample plate in tension with rubber bandimage description

Build a Light image description

  1. Extend the wires on the battery pack. The wires coming off of the battery pack are not quite as long as we would like them to be so we start by attaching extra lengths of wire. If you have a soldering iron you should solder these connections. Do this for both the red and black wires. image description
  2. Attach the LED. Red wire goes to the long lead, black wire goes to the short lead image description
  3. Glue to coathanger wire. This provides a flexible mount for your light image descriptionimage description
  4. Bend the wire to position the light. It should point directly down, facing into the objective lens. image description
  5. Take some pictures -- use binder clip to hold slide in place and bolt for focus adjustment. Make your light is pointing directly into lens to get enough light. image description

Final Assembly image description

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microscope passive-particle-monitors microscopes

barnstar:photo-documentation with:kgradow1 activity:microscopes with:wmacfarl with:bmela activity:basic-microscope


@stevie awards a barnstar to partsandcrafts for their awesome contribution!

This is great! Love the photos. Was thinking if there was a cheap product we could substitute for the LED and battery pack, to save a few steps, but not really sure if it's worth it. I saw these for ~$4.60 on Amazon, which is a bit pricey I guess:

But maybe if we make a kit, we could bulk order them.

Having the point source seems pretty important -- however, it seems possible to do a micro LED copper tape coin battery solution, which would bring the price down a bit.

Oh, is it important that the light be a point, and not multiple point, or a diffuse source?

Is this a question? Click here to post it to the Questions page.

We tried it with a bunch of different light sources, including a diffuse multi-LED source (book light). The best source was a single LED at close range pointed straight into the lens.

@warren @kgradow1 -- it's true that we did try a bunch of different lights, and the best we found was a single LED. But the main reason this was true, I think, is that it was really obvious where the light was coming from so we could easily point it through the slide and into the lens.

I think any light that's sufficiently bright and even is fine. The trick is that most of the cheap lights I've been able to find are made up of a bunch of LEDs so they don't actually light evenly, even with a diffuser, so it's hard to point them correctly. But I think it would be possible to find a good off-the-shelf light, but it would involve some research and trial and error.

This is awesome. maybe we should build out a part of the Q&A specifically about lighting. @maxliboiron has mentioned lighting can be a challenge and varies depending on the type of work you're doing.

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