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I decided to buy the following: USB Digital Microscope 40X-1000X LED Camera for Android, Windows, Mac, & Linux I looked at the wifi microscopes, but I was afraid that with the wifi, I would need to install some custom app on the phone, that might be a security issue. Given it supports Linux...

I must admit I never considered using these electronic microscopes. For my setup something that goes straight down with a large screen probably won't too well. I have my soldering station inside of a roll-top desk to prevent the furry demons of chaos (i.e. my cats) from jumping up and knocking...

I can understand the issues. I have had a few kickstarter projects that did not deliver. And I wondered about the horizontal orientation of the soldering iron. According to the comments, it is due to needing to put the camera and LED light on the iron. As I approach my 68th trip around the...

I just got notification of a new kickstarter project that ends on March 10th, 2026. It is a battery operated soldering iron that includes a camera and light. The soldering iron connects to your Android or Apple phone to give you an expanded view of what you are soldering. The super early bird...

Note, for various reasons, I have not been doing much with Teensys lately. Exactly where did you get the files from? Both Chris's original source and my updates have been mentioned in this thread. My Git repository based off of Chris's original files...

For most SPI devices, you can use any digital pin for the CS and/or DC pins. In the Teensy 3.1/3.2/3.5/3.6 processors, there are several special CS/DC pins that some of the display drivers use to provide micro-optimizations to speed up the display. These micro-optimizations needed both the CS...

A pre-designed board would be great, but if you use the Teensy 4.0, consider combining the following from Adafruit: Adafruit Teensy 3.2 feather adapter Adafruit Featherwing proto board Adafruit Teensy Feather adapter compatibility for Teensy 4.x What the feather adapter gives you is a JST plug...

Yes, I saw that. It is a shame, since I often bought Teensies from Adafruit (Adafruit being in NY is quicker for deliveries than Sparkfun in CO). Microcenter does sell the 4.1 (4.0 is currently sold out at the Cambridge MA Microcenter), but only the processors. However, in terms of buying new...

Another thing would be a Teensy 4.0/4.1 version of both prop shields (though it would be nice if the 4 pins on each end are lined up for 0.1" spacing). Obviously there would need to be changes, such as incorporating an I2S interface for sound, perhaps using PT8211 instead of the more complex...

I don't recall if I've replied to this before. For various reasons, I haven't been doing much with micro processors recently, but some thoughts on some useful boards: When I laid out prototype boards, some of the things that I put into the layout for 4.1 boards: Two Spi layouts, typically I...

Between 2020 and 2022, I added this page about Teensy compatibility to the unofficial Teensy wiki project: https://github.com/TeensyUser/doc/wiki/Teensy-Compatibility I also created this google spreadsheet on various microprocessor layouts...

If you want to use batteries with the common 2 pin JST plug, I've used the Lipo Rider Plus from Seeed. You plug the battery into the JST plug. You get 5 volt, 2.4 amp power out of a USB A plug, and you can recharge the battery via a USB C plug using 5 volt and 2 amp charging...

If anybody is using my github tree (using the meissner2 branch), I just pushed Chris's changes to github.

If you dig into this thread, I believe Chris mentioned how he/she/they did new eyes. The Teensy sources that Chris made and I modified all have the eyes compiled into the source. I would imagine you are using the original source that Chris used. In this source, the eyes are read from the...

Unfortunately, I haven't gotten back into Teensy mode.

FWIW, I bought a 2nd Gravity Gesture sensor, and like the first one, I can't get the second one to return any faces or gestures. I took the person sensor off the I2C bus, just in case it was interfering with things and it didn't seem to help. At a high level, it is kind of weird. The person...

Thanks. It is an interesting eye pattern. I've updated my git sources to include it. I broke out my Teensy eye platform with 2 round 240x240 GC9A01A displays out of mothballs, and I fixed the cold solder joint that had shown up. I discovered the person sensor I had on the package lost its...

Cool, do you have the new eye as .h and .C files?

I glanced at the library. It looks like it shouldn't be to hard to add support. I ordered a face/gesture sensor from Amazon. I've been having a lot of health issues recently, but I'll see if I can add the support in a bit. I imagine somebody might find it useful to have the uncanny eye...

For various reasons, I haven't done much with Teensys in awhile. I got a question from somebody who wanted to use the Person Sensor with TeensyEyes that Chris had done and I incorporated in my version of the code. Evidently the Person Sensor is no longer being made, but there is a similar...

Generally as long as the I2C addresses are different, things should work. I2C is designed to be a shared bus so the master processor can talk multiple difference devices. I've read there are some corner cases where things might not work, but I believe they are fairly rare: Having multiple...

Adafruit designed a Teensy to Feather adapter that will work (mostly) with the Teensy 4.0. With the longer Teensy 4.1, you need to raise the Teensy up so it clears the JST battery port, or mount the Teensy underneath (the outer ports use the feather wing pin out, not the Teensy pin out)...

Adafruit has some microprocessors (Qualia) that have support for RGB-666 displays using a 40 pin flat cable. Of course having a direct HDMI port might be useful as well assuming you can get more memory on the Teensy.

In the Teensy 3.x boards, there were a bunch of 'special' pins. Paul documented this many years ago in (look at comment #5): Special SPI pins As I understand it, the display drivers for Teensy 4.x don't have this special optimization. I believe that in the Teensy 4.0, pin 10 is a special...

As Paul has mentioned, Proto Supplies sells Teensy 4.1 with one or both memory slots soldered in. I've used them for the last couple of Teensy 4.1's that I've bought. While I can still solder through hole stuff, SMT soldering has become problematical (I've been having some muscle failure that...

Or alternatively, put several cheap microprocessors, that each handle maybe 8 analog inputs, and each one communicates to the Teensy via a shared I2C, SPI, or UART line. Ideally you want communication only when something changes (sort of like the MCP23017 where there is a pin output that is...

In the past there was an I2C display (TeensyView): https://learn.sparkfun.com/tutorials/teensyview-hookup-guide/all It would be nice if there was a base Teensy 4.1+ board that has a QWIIC port for I2C without needing the shields that Sparkfun makes. It would be nice if there were 2 jumpers...

I was curious. I didn't know what the board was so I went to tindie.com and found the entry. On a hunch, I went over to the PCB manufacturing company oshpark.com and I looked for grbiHAL, and I think I found two boards, one for the Teensy 4.0 and the other for the Teensy 4.1. The oshpark.com...

I don't know, you would have to test it out. Off hand, I imagine that using MTP in the background could affect latency, but who knows. I imagine that when you are transferring files, you are not worried as much about latency, and it won't matter. If you aren't transferring files, it shouldn't...

I must admit to not really understanding why you are doing this. Is it a one time operation, or will you need to do this regularly? Can you turn off the Teensy or must the Teensy be running? To me if it is a one time task, the simplest approach would be just to turn off the Teensy, put the...

FWIW, I had previously had had arduino-ide_2.2.1_Linux_64bit installed on my Fedora 41 system. I removed the Teensy port, and then I replaced the Teensy json file with the update. I could not get 2.2.1 to show Teensy after doing control-shift-P Ardunio-updates and restarting the IDE. I had to...

Before the Teensy 4.1 was released, there were a lot of people making PCBs to bring out the SD card and other pins: OSH park PCB of trainer4edu's PCB without USB host OSH park PCB of trainer4edu's PCB with USB host Trainer4edu's board description Blackketter's PCB Blackketter's github...

If you are using the Teensy 4.0, one possibility is to get the Adafruit Teensy 3.x feather adapter. I'm putting the Adafruit link along with a compatibility page I wrote for the old unofficial Teensy wiki site: Adafruit Teensy 3.x feather adapter Teensy feather compatibility Note, with this...

I'm curious what are likely 'cosmetic' flaws in the 'LEFTOVER_TEENSY_OTHER' item? I mean I will find out eventually when my grab bag gets here. I realize it is a grab bag, and it could be anything, but I was wondering what kind of things were discovered before shipping? And of course the...

Cards that are 32GB or smaller are formatted with FAT32 and typically have the VFAT support on top of FAT32 (VFAT adds support for names other than the 8+3 uppercase). Cards that are 64GB or larger are formatted with ExFat.

Thanks, fixed. I forgot to hit ^C to save the html link when I did ^V in the url box, it grabbed the previous text.

Well it is free until your program is running. When you call malloc/new, it allocates out of RAM2. For static/global variables you can use 'DMAMEM' and the variable is put into MEM2. Note, these variables cannot be initialized. I don't recall if they are guaranteed to be zeroed. If you have...

Well in addition to the RAM1 and RAM2 normally that comes with the Teensy 4.1, you have the option to solder 1-2 memory chips to the Teensy. You can solder 1 or 2 PSram chips You can solder 1 flash memory chip You can solder 1 flash memory chip and 1 PSram chips The PSram chips are fixed at 8...

I've been idly wondering whether Adafruit will continue to sell Teensies. Now, I realize that Adafruit sells some Sparkfun things, and Sparkfun sells some Adafruit things, and they address different markets. But the change of the supplier may change whether Adafruit will continue to stock the...

Yes, the Teensy 4.1 changed the pads under the PCB to be the first USB that can be used for programming, and not the second USB which can act as a USB host. On the 4.1, you have to use the 5 pins in the PCB to get to the second USB. I believe the Teensy 4.0 is the only Teensy where the bottom...

One minor thing to consider is something I run into with camera viewfinders. If you are going to view your screen outdoors and you will be wearing polarized sunglasses, note that TFT displays typically have one orientation that there are distortions when viewed through polarized sunglasses. On...

In general, it is a convenience vs. speed thing. Arduino is a wrapper over C++, and the code is compiled directly to the target machine. Circuit Python is an interpreter that runs on the target machine, that reads the source code, converts it to some internal format, and then uses the internal...

Dout and Din can only be the following pins: 6 (OUT1D) 7 (OUT1A), default DOUT 8 (IN1), default DIN 9 (OUT1C) 32 (OUT1B) 38 (Alternate for IN1) 39 (Alternate for OUT1A) MCLK1, LRCLK1, and BCLK1 all must be their respective pins (23, 20, and 21). Alternatively, you could switch to using the...

IIRC, you also don't want to use the 'optimize space' option in Arduino, as I believe it uses a version of printf that does not have floating point support.

I can't answer about PlatformIO, but under Arduino, if you are building for the Teensy 4.0, the Teensy 4.1, or the Teensy MicroMod, the default for double is 64-bit and constants are 64-bit by default. The hardware has direct support for both 32-bit and 64-bit floating point. If you have the...

It depends. Does the XBee board have its own micro processor on it, or are you supposed to mount the XBee on a board that uses the thing plus mounting. If it is the later, I believe the Sparkfun Thing Plus boards use the same pinout as the Adafruit Feather system. Adafruit sells a Teensy 3.2...

I suspect the interface uses 'int' (32,767 maximum bytes) or 'unsigned int (65,535 maximum bytes) for the length. If so, you will need to do a loop to transmit say 4,096 floats (16,384 bytes, which is the last power of 2 under 32,767) at a time, and transmit the remainder after the loop.

I don't recall seeing the entire mockumentary, but I recall Drummers for the Spinal Tap band did not have a long life span: And at the moment, of the 4 Beatles, only Ringo Starr has 2025 performance dates available (though Paul McCartney will be doing a tour in 2025, no dates are yet scheduled).

On the audio adapter the pinouts are set up so the 3 pins across are for a combined L/R speaker (i.e. the middle pin is the shared ground between the left and right signals). If you had two separate speakers, then the other two pins would be the ground, i.e. you can connect the speakers...

Given Paul doesn't design the actual microprocessor within the Teensy, he is dependent on the chips that are designed by the microprocessor companies. Given the newer chips no longer have 5 volt tolerance, Paul can't magically make the future Teensy be 5 volt tolerant without adding extra chips...