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SparkFun published a background video including an interview. The Story of Teensy: From PJRC to SparkFun Partnership

Please see the news article at: The Register Some of the information in the article is inflammatory. I am only posting this because Teensy depends on AdaFruit for software. Please keep any replies respectful and about products.

Possibly this discussion from a different forum: Electronics Stack Exchange

StarTech makes one I'd trust for something like this. (Amazon ID# B0BZSY93HH ) It's pricey compared to most offerings, but USB does have an inherent design limit on the BUS of 5 levels from the root controller. By design, each hub is one USB in and four USB out. All physical hubs hide this by...

I'd like to see an industrial input/output accessory—something like the ST CLT01-38SQ7. There is a wide range of sensors that can't easily be adapted to a microcontroller due to signaling requirements, such as voltage and minimum current. Even smart sensors using EtherCat (Modified Ethernet...

Search for PLC output amplifier. You want a 3.3 VDC input to a 24VDC output. I think they go up to 32 channels. It's just a lot of wiring, unfortunately.

Check AliExpress for Modbus 32-channel input and 32-channel output modules. To connect the Teensy to the modules, you will need either RS232 or RS485 signal drivers. Higher channel counts tend to be NPN. There is a 64-in/64-out module.

Due to the 1.0mm pad pitch, no direct SMD mount socket is available. The microSD socket requires a 1.1mm pad pitch. In the past, users have been advised to solder short leads or a ribbon to the pads and connect them to a microSD or SD card socket on a daughter board.

If you want a slightly lower-tech solution, I would recommend a: NEXTION INTELLIGENT HMI DISPLAY They use a TTL serial interface to pass metadata back and forth based on the user's actions. Micro programs run in the display to handle all screen and form elements except for some data input...

He's asking about using a PCI generic bridge to connect to the Teensy 4.1, something similar to the Broadcom PEX 8311. In terms of complexity, this is pretty high and requires knowledge of drawing high-speed traces to work. The best you can hope for in terms of speed is determined by memory...

Carplay development is currently restricted to Apple IOS licensed developers. Please see developer.apple.com for more information. Also, app development can be long and frustrating due to language requirements. Then there is the matter of getting past the developer guidelines and App Store...

Hardware wise, no. You would need additional resources, at least something like a W5500. If this is a near one off design, I would suggest a MODBUS-TCP to MODBUS-RTU (Not MODBUS-ASCII) bridge to make MODBUS available to the Teensy 4.1 via a serial port. MODBUS doesn't tend to be the speediest of...

Protosupplies has stock of configured Teensy 4.1 for now. You are probably going to have to pay more and possibly accept add ons you don't particularly need until this is resolved. https://protosupplies.com/product/teensy-4-1/ https://protosupplies.com/product/teensy-4-1-fully-loaded/...

Slightly different solution While not a direct solution to your answer, Sparkfun now markets the Teensy MicroMod combined with the Wiz5500 module embedded IPv4 processor and a 3.3V 1A 802.11.3af. It's 3 PCB's that screw together, along with IIC and a microSD card socket. It's not the cheapest...

It's normally forgotten about, but you can use a Raspberry Pi Zero W or Raspberry Pi 3A for less than the cost of some implementations of WiFi. There can be a bit of a learning curve writing a server daemon to handle the data, but the hardware is pretty rock solid at this point. There are...

Capacitive prox switches generally use 4 - 30 mA each. This is from 22 years of experience. The response time is generally well under 40,000 detects per second, under 400 is more common, so you can downclock your teensy to a minimum and you probably won't notice a thing. If you are using...

This sounds an awful lot like ground loops and RF induced currents on the cabling. While shielding normally works great, you may just want to switch to something optical for the trigger. TOCSIS transmitter and receivers are fairly robust and the cabling can be purchased premade just about...

A raspberry pi is essentially a full computer with security risks, a drastically larger physical footprint, and significantly higher power dissipation needs than what I am discussing. The last two are big problems with almost all forms of IOT and a large part of why Espriff is popular right now...

I'd like to see a version available with the Ethernet magjack and host USB is already mounted. Maybe move most of the I/O to a surface mount socket that a cable could be connected to for a daughter board since the allowed ampacity is very low per pin from the processor. Possibly a lipo battery...

Please move just your files out of the Documents/Arduino directory and delete the Documents/Arduino directory. It will recreate the directory on the next execution correctly and prompt you for additional system level permissions. There is a permission problem that isn't handled very well and the...

I'm not having any luck running the Arduino package inside the MacOS without using sudo. Every time I try to run it I get something like this. tccd will kill the process automatically and this is posted to the console log. Even running Arduino 1.8.12 directly will cause this same issue. This...

Arduino IDE 1.8.9 as downloaded from Arduino is flat broken with the next OS for the stated reason. In their forums, the only way around this is to use the BETA version of the IDE.

So far I'm impressed with the hardware, but I've hit a brick wall with the software. Changes were made to OSX that requires Arduino 1.9.0 beta to even run. There is no way to compile or download code with 1.8.9 on 10.15 because the OS blocks access to the user and download directories by default...