StereoPi v2

by StereoPi

The open-source stereoscopic camera based on Raspberry Pi with Wi-Fi, Bluetooth, and an advanced powering system

View all updates May 07, 2021

You Think Crypto Is Volatile? Look at the Chips Market!

by Eugene Pomazov

The 2021 semiconductor market vs. the 2021 crypto market

StereoPi v2 manufacturing is underway. PCBs were ready a few weeks ago, and nearly all of the components we need are waiting for the production line to start assembly. But there are a couple of parts in our BOM that are causing unexpected issues. And we’re not alone…

You might have heard some news, lately, about global issues in the semiconductor market. COVID-19 and other (including a fire at a Renesas plant) have combined to wreak havoc on component availability. You can learn more by Googling "global chip shortage 2021." One interesting thing about this particular shortage is that—unlike most such issues—it’s affecting even small projects like ours.

"Crypto Is Volatile," They Say…

Our project is not related to Bitcoin (or any other cryptocurrency), and we don’t use it for anything. But it is interesting for the sake of comparison. In summary, a single Bitcoin was worth about $6k in the Spring of 2020 and is now worth about $60k. That’s a 10x increase in just one year. (And remember that the value of Bitcoin fell by a similar amount just a few years ago.) So sure. Crypto is an extremely volatile asset. But it’s nothing compared to today’s semiconductor market!

Chips vs. Crypto

StereoPi v2 uses two chips to manage power, both of which are out of stock. And we mean really out of stock…

ETA. No comment.

One of these chips is TI’s TPS2121RUXR. It’s responsible for seamlessly switching between USB Type-C and JST power sources. A couple of months ago, it was about $1 per piece. As of a month ago, it’s about $13. That’s a 13x increase in the price of a part that won’t be showing up until next year.

The other chip is TI’s TPS22965DSGR, which is responsible for powering the board on or off based on the state of the power switch. Its original price was $0.23. It’s now 6.50. That’s a 28x increase!

And chips win by a knockout! Better luck next time, crypto…

Finding a Solution

These prices have destroyed our unit economics and forced us to adopt a Plan B. When you can’t get your hands on a part, you typically have three options:

  1. Find a replacement with the same footprint.
  2. Find a replacement with a different footprint and redesign your PCB to accommodate it.
  3. Wait for three to four months and hope that somebody will sell you your original part at (close to) the original price.

For our "power on" chip, the TPS22965DSGR, we found a pin-compatible replacement (the TPS22965NTDSGRQ1) that’s still available at an acceptable price. Great. One down, one to go.

Unfortunately, our seamless power-switching chip (the TPS2121RUXR) was a tougher nut to crack. The TPS2120YFPR is the only alternative from TI that fits our requirements, but it has a different footprint and an increased power source switch time. We could swap it in, but then we’d have to spend weeks redesigning the PCB, building samples, and testing them. And, after all that work, we’d still be left with power switching that was not seamless. (Nobody wants seamy power switching…) This is not our way.

Finding a Good Solution

So we came up with a Plan C: we contacted small, local semiconductor resellers all over the world and asked them about their existing stock of TPS2121RUXR chips. Many of these resellers are small enough that you can’t find them on portals like Octopart, so it wasn’t easy. But it was well worth the effort. We were able to find several hundred pieces of our preferred chip in Eastern Europe! They have been sent to our factory, and we expect them to arrive next week.

Below is a tape with 868 pcs of the TI TPS2121RUXR:

My Precious...

Conclusion

Despite the above heroics, this chip shortage has still knocked us out of our planned trajectory. Unfortunately, we had to push our estimated ship date back by a month. Fortunately, we did not have to push it back until Fall. Or until next year some time…

Finally, it seems like these supply-chain issues might be with us for a while, so we’re currently working to order key chips for future batches. Because who knows how much they’ll cost in September…

About the Author

Eugene Pomazov

StereoPi  ·  Realizator  ·   St. Petersburg


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of $35,000 goal

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Product Choices

$49

StereoPi v2 Slim

Perfect for DIY ninjas and those wanting to embed StereoPi in a tight space. This board is the same as the standard edition, but without all the bulky connectors - the Ethernet RJ45 jack, GPIO header, and dual USB Type-A connector have not been populated. To use this board, you will need your own Raspberry Pi Compute Module, cameras, and camera ribbon cables. Two short power cables and three jumpers already included.


$55

StereoPi v2 Standard

The world of stereoscopic video awaits! This board is the ultimate interface between two cameras and a Raspberry Pi Compute Module. It comes with all the bells and whistles, including Ethernet, dual USB ports, GPIO header, microSD slot, HDMI output, and more. To use this board, you will need your own Raspberry Pi Compute Module, cameras, and camera ribbon cables. Two short power cables and three jumpers already included.


$185

StereoPi v2 Camera Kit

Everything you need to assemble your camera! Includes StereoPi Standard, CM4 + external antenna, 2 cameras (IMX219, 160 FOV), a TFT screen, a shot button, camera-mount plates, nuts & bolts, 3 jumpers, a 15 cm tripod, and 2 microSD cards with pre-written SLP and OpenCV images!


$25

StereoPi PoE HAT

This board adds Power over Ethernet option to your StereoPi


$55

StereoPi HQ Metal Housing

Metal housing for a couple of HQ cameras with advanced adjustments features. Includes StereoPi HQ housing base + carriages, 2 x HOYA CM500 filters (8.9 x 8.9 x 1 mm), a set of nuts/bolts/washers for assembly, and a tripod. To use this kit you need a couple of HQ cameras and a couple of C or CS lenses.

Credits

StereoPi

We are a small team of geeks who have been making remote-controlled things with livestreaming video since 2010. We've done everything from boats and planes, to robots, copters, and VR helmets. If we can't find the right tools for our projects, we build them ourselves.


Eugene

Sergey Serov


NexPCB

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