Let's talk of possible new accessory boards

$50 dev board : https://www.microcenter.com/product/665366/arduino-nicla-voice ($53 DigiKey) Or direct ARDUINO.cc

Key Features​

  • Component Type: Development Board
  • Components: Mainboards
  • Processor: Syntiant NDP120 Neural Decision Processor
  • Clock Rate: 48MHz
  • Flash Memory: 512KB
  • SDRAM: 64KB
  • Bluetooth Modem: Bluetooth 5.0 BLE
  • Sensor: Microphone, 6-Axis IMU, 3-Axis Magnetometer
I didn't see that. But okay, we don't need all the sensors and other stuff. That just limits us. Peripherals can be connected to the Teensy. Actually, we only need the chip and the connectivity to the Teensy. That also makes it cheaper.
But my real goal was: something NEW. Not always the same old boards... Others can do better with cameras, for example (because of the right pins, etc.). But I'm repeating myself...
 
Robin and I have a meeting with SparkFun next week. Among topics we'll likely discuss is possible new hardware.

Teensy 5.x is not up for discussion (NXP isn't shipping Cortex-M85 yet). Neither is RT1170 up for discussion right now, as the chips are physically too large. Please DO NOT waste time bringing these up. Yeah, I know everyone wants to talk next-gen Teensy, but this thread is meant to be about useful accessories.

I would like to hear your thoughts on possible accessory boards. Historically Teensy 4.x has only 2 such boards from PJRC, Audio Shield and OctoWS2811, plus some unassembled kits. Today I believe SparkFun only Teensy specific accessories are QWIIC adaptors and an Arduino Shield adaptor.

If Robin & I could talk SparkFun into making only 1 or 2 more (ideally to get started with more to come later) which types of accessory boards would you want to see? It doesn't have to be something you'd personally use... think of all the times we get questions on this forum where someone is struggling to make a specific type of peripheral work. What boards could SparkFun make that would help the most?

(....I'm intentionally holding back my own list for now because I really want to hear your unbiased thoughts first....)

I vote for boards that add LoRa, NB Cellular and GPS. Not so much becuase it's hard to add a module but for the integration we would get by having something like the Audio Design Tool.

But more exciting to me would be to attach a Sipeed M1S (BL808) to add 100 GOPS NPU. train on laptop and upload. it's $4 for bare module.

 
Not with the current T4 boards, there aren't enough of the CSI pins routed to make it feasible.
Interesting. I’ll have to check my 2 and 4 year old schematics to see how I got the FLIR Boson and OV7670 cameras to send images to the T4.1 through the CSI interface ;-)

At this time I just remember that the OV7670 software was difficult due to the lack of documentation of the control codes. The Boson was well documented. I eventually switched to collecting the Boson images through the T4.1 USB host port. That project ran into more documentation issues—with the Teensy USB stack. But the wiring was a lot simpler!
 
Interesting. I’ll have to check my 2 and 4 year old schematics to see how I got the FLIR Boson and OV7670 cameras to send images to the T4.1 through the CSI interface ;-)

At this time I just remember that the OV7670 software was difficult due to the lack of documentation of the control codes. The Boson was well documented. I eventually switched to collecting the Boson images through the T4.1 USB host port. That project ran into more documentation issues—with the Teensy USB stack. But the wiring was a lot simpler!
A Teensy-based time lapse camera would be, well, based...
 
Robin and I have a meeting with SparkFun next week. Among topics we'll likely discuss is possible new hardware.

Teensy 5.x is not up for discussion (NXP isn't shipping Cortex-M85 yet). Neither is RT1170 up for discussion right now, as the chips are physically too large. Please DO NOT waste time bringing these up. Yeah, I know everyone wants to talk next-gen Teensy, but this thread is meant to be about useful accessories.

I would like to hear your thoughts on possible accessory boards. Historically Teensy 4.x has only 2 such boards from PJRC, Audio Shield and OctoWS2811, plus some unassembled kits. Today I believe SparkFun only Teensy specific accessories are QWIIC adaptors and an Arduino Shield adaptor.

If Robin & I could talk SparkFun into making only 1 or 2 more (ideally to get started with more to come later) which types of accessory boards would you want to see? It doesn't have to be something you'd personally use... think of all the times we get questions on this forum where someone is struggling to make a specific type of peripheral work. What boards could SparkFun make that would help the most?

(....I'm intentionally holding back my own list for now because I really want to hear your unbiased thoughts first....)
Hi, personaly i use xplane12 flightsim alot and use the old 2++ flightsim plugin what i would like is a feature to send keycode and joy commands. Then the chip is perfect for simmers, and ofcause a play mp3 function, looking forward to the release 5....
Tore
 
Robin and I have a meeting with SparkFun next week.
Hi Paul,

last June you mentioned that you and Robin were planning a discussion with SparkFun about possible new accessory boards for Teensy 4.x, and you invited community feedback on which types of boards would be most useful.

That thread generated a lot of interest and many concrete suggestions. Since then, there hasn’t been much visible follow-up, so I wanted to ask whether there has been any progress or conclusion.

In particular:

  • Were any of the proposed accessory board ideas evaluated further or ruled out?
  • Is there anything in early planning or development that can be shared at this point?
Even a short status update would be helpful, including if the outcome was simply that nothing is moving forward right now. I expect many people here would appreciate knowing where things stand.

Thanks for your time, and for continuing to involve the community in these discussions.

Best regards,
Frank
 
I should be careful about talking too much of private meetings. But everyone here does deserve an update. If this seems a bit awkward, please understand I'm trying to balance community openness with private business discussions.

Supply chain problems struck from June to September 2025. Teensy was regularly out of stock. Production did finally get caught up by October. During those months it was difficult to focus on anything else. In our most recent meeting just a few weeks ago, the big elephant in the room was the drama with Adafruit. Every time we've agreed "let's do something" on accessory products which then slowly turns into "look at this next quarter".

My attention has also been divided. PJRC is still shipping the bootloader chips. We've long needed to transition from trays to tape (tape & reel or piece of cut tape). The way we do it now with manually using tweezers and a ZIF socket just won't work long term, especially for transition to SparkFun programming and selling those chips. Two ways are under consideration, either repurposing one of the open source pick and place machines which would let us keep the current programming process, or adapting how the programming is done to fit the capabilities of companies that do chip programming service. I've poured way too much time into over the last several months....

I wish that was the whole story, but to be honest, so far SparkFun hasn't seemed excited about Teensy accessory products. We did show them list that came out of this forum conversation. Their impression was to pick 1 or 2 and see how they go.

So far we've managed only 1 new accessory, which was driven more by supply chain problems on the magjack than offering anything new. It also addresses the common request of people who wanted it assembled. Exciting, no. Necessary, yes.

I did recently put some work into an initial attempt at a CAN bus shield. I gave the info to SparkFun and they did some more work with it, but I haven't heard anything in a few weeks. I did send a PCB to OSH Park....

I do agree a high performance ADC board would add a lot of great capability. Right now that seems like far too much to expect from SparkFun. We really need to build up momentum with some easier wins. That's why I picked CAN, as it's relatively simple and low cost and doesn't require new software development.

Another way accessory boards might go is with companies not named SparkFun. Or publishing open hardware designs with the intention various companies will copy. I have mixed feelings on this, and how I would need to change the PJRC website to make it successful. But after we get the bootloader chips fully transitioned to SparkFun, if we're still looking at little or no momentum on accessory boards, I'll probably feel less conflicted than I do now.
 
Would like to see boards like adafruit uses for their feather wing. But that is another story
I would say that IS the main problem. Teensy is mainly a dev board, but not an ecosystem, like AF Feather or SF Thing Plus. The T3.5/6 ot T4.1 were great for me when I wanted to have a powerful single board MCU with SDIO. Yes, the Teensies have been used as MPUs in larger projects and products, due to easy integration, but that does not guarantee future development, and new add-on boards do not help.

Let us face it, the Teensy idee was/is PJRC's IP. To me, having SF producing T4.x and in the future even the Bootloader chip is equivalent to sending Teensy into a retirement home.
 
would say that IS the main problem. Teensy is mainly a dev board, but not an ecosystem, like AF Feather or SF Thing Plus
when I was talking about the featherwing addons I was more thinking along the lines of the old Propshield board- just for clarification
 
when I was talking about the featherwing addons I was more thinking along the lines of the old Propshield board- just for clarification
Definitely the Audio board was a successful add-on, some improvements could have been possible (e.g. I had issues with digital interference on analog signal)
 
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