A Hot-Swappable Battery Grip Keeps The Camera Rolling

April 21, 2021 by Lewin Day 14 Comments

There’s nothing worse than being in the middle of an important shot, only to have the camera’s batteries die on you. The losses can be very real, so it’s best to avoid them entirely. In an effort to do so, [funkster] built himself a battery grip for his Canon EOS M.

The hack is based around the venerable 18650 battery, packing 3.6V of lithium-ion goodness into a compact metal can. [funkster]’s build has slots for two of these cells, powering the camera off of one and keeping the other in reserve. The cells are monitored by a STM32 microcontroller, which switches from one battery to another as they run out or are removed. This allows batteries to be swapped while the camera is on – a highly useful feature. There’s even an OLED display to keep an eye on the state of charge of each cell.

The manner in which power is connected to the camera is rather amusing. An original Canon battery that slides inside the camera was gutted and turned into a simple adapter for the battery port. The battery grip, which wraps around the camera body, connects to this via pin headers that pass through a hole drilled in the camera’s case. It’s a permanent mod, but one [funkster] is happy with for the added usability – especially as doing it this way still provides easy access to the SD card slot.

Keeping a camera juiced on the go can be a headache without the right gear. [funkster] demonstrates that if you can’t buy it, you can always build it yourself. If your problem isn’t battery power, but your camera is overheating, you can of course fix that too. Video after the break.

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Large Format Lego Camera Is A Bit Near-Sighted

April 19, 2021 by Zach Zeman 7 Comments

Photography doesn’t have to be expensive, something that’s especially true in the realm of film photography, where the imperfections of the medium can be half the appeal. There are many DIY plans and kits available for analog cameras, but [bhiga143] had couple spare components and a pile of small, colorful bricks lying around, so he decided to build a functional 4×5″ film camera out of Lego.

Details are light for this build, but with a little knowledge about camera structure we can guess at what’s going on inside. Simplicity makes for robust design, and what we have here is in effect a box with a lens on one side and photographic film on the other. The center section of the front, which actually supports the lens, is capable of sliding in and out to adjust focus. On the far side (not pictured) is a slot just wide enough to insert a standard film holder.

The camera really is a hack. [bhiga143] stayed true to the “Lego” part of Lego camera, so there is no glue, no black paper lining, and no frills. The tripod is whatever stack of books lay underneath it. The lens is, quote, “barely functional”. There are light leaks galore, and it can’t focus beyond about 3 feet (1 meter). But every one of those points just makes us love it more. Every nugget of imperfection is a few words added to the story each picture tells. And we honestly can’t wait to see more pictures.

Other Lego cameras we’ve seen have been smaller and less colorful, but using a simple pinhole lens can reduce the overall cost. Of course, you’re not limited to Lego if you want to build your own pinhole camera. Although, the ubiquitous plastic bricks can also be useful in later stages of the film photography process.

An AI-Free Way To Catch Wildlife On Camera

March 29, 2021 by Dan Maloney 14 Comments

Judging by the over-representation of the term “AI” in our news feeds these days, we’re clearly in the exponential phase of the artificial intelligence hype cycle, and very nearly at the dreaded “Peak of Inflated Expectations.” It seems like there’s nothing that AI can’t do, and nowhere that its principles can’t be applied to virtuous — and profitable — effect.

We don’t deny that AI has massive potential, but we strongly suspect that there will soon come a day when eyes will roll and stomachs will turn at yet another AI application that could have been addressed with something easier. An example of the simpler approach can be seen in this non-AI wildlife photo trap, cobbled together by [Sebastian] to capture pictures of some camera-shy squirrels. Rather than train an AI with gigabytes of squirrel images, he instead relies on his old Sony Alpha camera, which has a built-in WiFi. A Python script connects to the camera, which is trained on a feeder box and set to a very narrow depth of field. That makes a good percentage of the scene out of focus until a squirrel or other animal comes along looking for treats. The script detects the increased area of the scene that is now in-focus with a Laplace operator in OpenCV, and triggers the camera shutter. [Sebastian] ended up with some wonderful shots of the shy squirrels using this scheme; the video below describes the setup in more detail.

It’s not the first time we’ve seen Laplace transforms used to gauge image sharpness, of course, but we really like the approach [Sebastian] took here for its simplicity. The squirrels are cute too.

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Image Sensors Demystified By [IMSAI Guy]

March 27, 2021 by Al Williams 2 Comments

The February 1975 issue of Popular Electronics had what was — at the time — an amazing project. The Cyclops, a digital camera with a 32 by 32 pixel resolution with 4 bits per pixel. It was hard to imagine then that we would now all carry around high-resolution color cameras that were also phones, network terminals, and so many other things. But how much do you know about how those cameras really work? If you want to know more, check out [IMSAI Guy’s] recent video on how image sensors work.

The video doesn’t cover any practical projects or circuits, but it has a good explanation of what goes on in modern digital cameras. If you don’t know what digital cameras have in common with an octopus, you might want to watch.

If you want to see what the state of the art in 1975 was, have a look at this post. The image sensor in that camera didn’t have much in common with the ones we use today, but you have to admit it is clever. Of course, 1975 was also the year Kodak developed a digital camera and failed to understand what to do with it. Like the Cyclops, it had little in common with our modern smartphone cameras, but you have to start somewhere.

New Part Day: Onion Tau LiDAR Camera

March 18, 2021 by Donald Papp 40 Comments

The Onion Tau LiDAR Camera is a small, time-of-flight (ToF) based depth-sensing camera that looks and works a little like a USB webcam, but with a really big difference: frames from the Tau include 160 x 60 “pixels” of depth information as well as greyscale. This data is easily accessed via a Python API, and example scripts make it easy to get up and running quickly. The goal is to be an affordable and easy to use option for projects that could benefit from depth sensing.

When the Tau was announced on Crowd Supply, I immediately placed a pre-order for about $180. Since then, the folks at Onion were kind enough to send me a pre-production unit, and I’ve been playing around with the device to get an idea of how it acts, and to build an idea of what kind of projects it would be a good fit for. Here is what I’ve learned so far.

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Explore The Cosmos With This DIY Digital Telescope

March 5, 2021 by Tom Nardi 11 Comments

Getting a closer look at the Moon isn’t particularly difficult; even an absolute beginner can point a cheap telescope towards our nearest celestial neighbor and get some impressive views. But if you’re looking to explore a bit farther, and especially if you want to photograph what you find out there amongst the black, things can get complicated (and expensive) pretty quick.

While building this 3D printed automated telescope designed [Greg Holloway] isn’t necessarily cheap, especially once you factor in what your time is worth, the final product certainly looks to be considerably streamlined compared to most of what’s available in the commercial space. Rather than having to lug around a separate telescope, tripod, motorized tracker, and camera, you just need this relatively compact all-in-one unit.

It’s taken [Greg] six months to develop his miniature observatory, and it shows. The CAD work is phenomenal, as is the documentation in general. Even if you’re not interested in peering into the heavens, perusing the Instructables page for this project is well worth your time. From his tips on designing for 3D printing to information about selecting the appropriate lens and getting it mated to the Raspberry Pi HQ Camera, there’s a little something for everyone.

Of course if you are looking to build your own motorized “GOTO” telescope, then this is must-read stuff. [Greg] has really done his homework, and the project is a fantastic source of information about motor controllers, wiring, hand controllers, and the open source firmware you need to tie it all together. Many of the ideas he’s outlined here could be applicable to other telescope projects, or really, anything that needs to be accurately pointed to the sky. If you’d like to get started with night sky photography and aren’t picky about what kind of things you capture, we’ve seen a number of projects that simply point a camera towards the stars and wait for something to happen.

[Thanks to Eugene for the tip.]

A FLIR One Pro Sees Again, Thanks To Some Nifty Soldering

March 2, 2021 by Jenny List 29 Comments

The Flir One Pro is a thermal camera that attaches to a mobile phone with a USB-C plug. [Gigawatts] has one, and unfortunately managed to drop it, breaking the USB-C plug and rendering the device useless. The plug is separate from the main PCB, an assembly of its own with a flexible cable, but FLIR are not interested in supplying spares. What was the answer? Wire data lines into the device’s charging port, of course!

The One Pro has its own battery, and to avoid draining the phone it is charged through another USB connection, this time a socket. The data lines aren’t connected, which necessitated some very careful soldering of wire-wrap wire to an SMD package to fix. When completed and secured with glue the resulting camera works with a USB-C cable, and there are plans to mount a tripod thread receptacle in the space left by the USB-C plug.

It’s disappointing that Flir choose not to supply replacements for the USB-C plug assembly, seemingly they see the device as a throwaway piece of consumer electronics rather than the expensive instrument that it is. This modification should at lease allow some unfortunate One Pro owners to revive their dead cameras.

If you’re curious about the Flir One series of cameras, perhaps you’d like to read our review.