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Seems like a safe idea. Interrupt pins floating for digital use seems like it would never be commonly useful.

Confirmed. After cutting the trace the OLED and Teensy work as expected when powered through the T4.0 USB connector. I have two Teensy4's that are soldered to feather adapters. I have cut the programming pin trace on one of the two boards. The...

The emulated EEPROM uses a portion of the flash memory chip to store its data. You can find the W25Q64JV-DTR Datasheet on the Teensy 4.1 page tech info section. For the raw speed specs comparable to those raw SD specs, turn to pages 89-90...

Just to confirm, did cutting those pads apart make it work without requiring the extra power source? Or asking another way... now that Teensy 3.2 is discontinued and people will only use this adapter for Teensy 4.0, should we ask Adafruit to...

Hi, I am working on a report for a competition, and I should compare SD card and Teensy 4.1 Emulated EEPROM for storing a small data set. But I couldn't find enough information for Emulated EEPROM. You can see my comparison table and missing...

Seems this is only an issue based on the program used to open the files. Using an alternative has solved that problem.. As for transfer speed with a sample 4MB file takes just over 6 seconds. This is with T4.0 and Audio shield mounted SDcard...

While playing with the Arduino USBHost lib and adding a lib for wired Joysticks I was working with the 2 new controllers that I added to USBHost_t36. PS: The Teensy USBHost_t36 is heads and shoulders more flexible and my 2 cents better (Giga...

Don't remember the transfer speeds we say off hand but I did just check that I can open multiple cards from a micromod buit-in SD card no issues. I am on a Windows 11 pc - also tested on a Win 10 machine a long time back. In terms of writing to...

Don't remember the transfer speeds we say off hand but I did just check that I can open multiple cards from a micromod buit-in SD card no issues. I am on a Windows 11 pc - also tested on a Win 10 machine a long time back. In terms of writing to...

While playing with the Arduino USBHost lib and adding a lib for wired Joysticks I was working with the 2 new controllers that I added to USBHost_t36. PS: The Teensy USBHost_t36 is heads and shoulders more flexible and my 2 cents better (Giga...

You may have a ground loop. You probably have an SD card that draws quite some current when writing. And you maybe use a power supply that is dipping when the Teensy draws more significant current. I think the reference voltage for the ADC is...

So I disconnected the program pin by cutting the pads on the PCB and everything works correctly. Thank you all for your help! It is greatly appreciated!

Ok, so I just hooked the display up to a separate power supply and everything worked correctly. The program pin was not connected for this test. I checked continuity from the T4 program pin to every pin on the feather breakout, and the only...

Thanks for all the suggestions... Led being on is fine, it has mains supply. I will see if there is room on my PCB for that header... it's really tight. I do have a space about 150mm way in the enclosure where a dedicated second comms PCB could...

I'm struggling to craft a search string for this, so please forgive if this has been answered. For a new Teensy (4.1 in my case - and 3.2 until recently) that has not has an RTC connected or powered, I'll like to detect that the clock is not set...

You have to implement Daylight Savings Time separately. It's not part of the Time library.

Thanks for the Eagle work! Looks like Adafruit meant for the Program pin to be able to disconnect by cutting these pads apart. Unless there's some specific need for the other connected boards to be able to put Teensy into programming mode...

I'm re-designing moving from Teensy 3.2 to Teensy 4.1 timeline.h defines a tmElements structure that has no "time zone" or "time zone offset" that I can see. The solution depends on several things: - discovering the time - from an external...

Here is the PCB layout: And the schematic is attached. The Program pin goes to a pad next to pin 16 [bottom-left]. Paul

Excellent to hear!

Or if you have some idea of which signal might be connected to that pin, can you arrange to have it not connect? The idea is to prevent the Program pin from accidentally being pulled low, which puts Teensy into programming mode where the red LED...

Maybe something unexpected is happening with the Program pin? Looks like *something* connects to that pin on Adafruit's adapter board. Can anyone with Eagle CAD open the schematic and post a PDF copy?

Sorry, I have one of those feather adapters around here somewhere. But Some of the stuff I am not sure about is how compatible is the feather adapter to the Teensy 4.x? Probably most of it is fine, but wonder about the pins at the side...

I am also having some difficulties with MTP. Using the MTP_Teensy I have included MTP.send_DeviceResetEvent(); Which has allowed for the Teensy to remain connected to the PC and refreshing the directory in windows now shows newly written files...

Looks like Adafruit shipped my older on Wednesday (it was placed on their website over the weekend) and the tracking info says it's due to arrive early next week. Please understand if the lockup problem does turn out to be a bug in any of the...

This error means the gcc toolchain doesn't work with MacOS older than 10.14 (Mojave). It definitely does *not* work with 10.13.6 (High Sierra). Teensyduino 1.57 and older had gcc 5.4 which worked on old MacOS all the way back to 10.7 (Lion)...

I’ll figure it out mate, I just need a break to refresh the brain cells

I’ll figure it out mate, I just need a break to refresh the brain cells

The proper operation with MTP is to do either generating files or using mtp-loop. Well, at least that is the mode that works. Also, after writing to uSD, the PC must be told (e.g. by user) to remount/reset the MTP responder (on the Teensy). when...

Actually the issue is that windows isn't updating the directory listing to show that file is actually being rewritten to again. I just did the same thing but pulled the after doing a cut and paste to PC (of course I waited for the next write and...

Ah, I have zero experience with recent MacOS… Arduino 1.8.13 is not the most recent, but again don’t know what’s compatible with your setup. A search for dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin turns up stuff, but...

Just an addition, if you are intending using the ESP32C3 from battery, the TenStar has an LED always on. I suppose it could be cut/clipped off.

installed teensyduino version 1.58 still cant compile anything

tried installing 1.59 beta #4 there isnt a version for high sierra 10.13.6 installed Mojave version instead, on arduino 1.8.13 nothing will compile now...

I think I tried that and NO it won't. I tried all sorts of action on the PC and they all resorted in Teensy ignoring the file. It's interesting that when the file is opened a file is returned but Teensy then does not carry out any actions on the...

From a Windows perspective, cutting the file from Teensy, means copy the file first and then subsequently delete the original file on Teensy. If you, from Windows, make it a 2-step action like copy the file first and then as next action delete...

I wouldn't be surprised if the inrush current of the 3V3-to-12V boost converter [FAN53315] used on the Adafruit OLED board [see schematic] is too much load for the Teensy 3V3 regulator to power up the Teensy correctly. For testing purposes: is...

I have a system where I gather data and write it to a file every minute. If I cut the file (from Teensy) and paste elsewhere on the PC the Teensy will not re-create the file and write to it. dataFile = SD.open("datalogZ.csv", FILE_WRITE); is...

I tried this, and it didn't really seem to make a difference (I also had a resistor connected).

A little about AsyncWebServer_Teensy41: it doesn't really use the QNEthernet library. It does use the initialization machinery, but then uses the included lwIP stack (via the Teensy41_AsyncTCP library) and not the QNEthernet API. I wonder if...

Which Teensyduino are you using? 1.59 beta #4 has a fix for issues discovered with a different processor-based I²C slave - it might be worth a shot. Discussion on the other hardware can be found in this thread. You may also need to check if the...

Whilst you are developing your project (software wise) I suggest that you use an ESP32C3 board with a connector. It makes programming and re,re,re programming so much easier, just having to plug in the ESP32C3 rather than un plug it from the PCB...

Yeah I feared that I might kill the teensy, but luckily I didn't. It's working as expected.

Thanks Paul, I got it working. I did follow the instructions and it worked. Thanks for pointing it out, I'm able to get the code working on teensy.

I fear you are popping all the analog inputs one by one - 5V is typically instant death to any T4.0/T4.1 pin, or if unlucky the entire chip.

First of all: do not connect the AS5600 sensor to the +5V ! The Teensy 4.1 is a 3V3 device and will get killed when the input voltages are higher than 3V3. When you power the sensor by 5V, the analog output will also near 5V. So don't use the...

Yes, those 8 pins only take up a small amount of space, the rest of the T-01C3 could just overhang the end. The other thing you could do is mount the Teensy to the top of the PCB with the ESP32C3 mounted from below with a slight (say 0.2") offset...

Maybe in future software we should have attachInterrupt() just turn on hysteresis automatically?

Here, on the left, is another cheap, small ESP32C3.

One on the left. I am really short of PCB space.