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I've got the camera running now and I'm hitting something you may be familiar with. I’m viewing RGB565 output of an 8 color vertical test pattern with an oscilloscope and the output only sort of makes sense. I can see the pins change state on the test pattern boundaries, but the output is not...

Can you share where you got your doc? The one I'm using doesn't have that table. Also, the register documentation I'm using shows the COM15 config of x0 listed as 'Normal RGB'...? Further, the pixel data output cells in the table don't seem to describing YUV4:2:2 or RGB4:2:2...does the text...

I have an OV7670 working at a basic level with a T4.1, where I can store the frame in an add-on RAM unit and forward it to a PC via ethernet. The camera documentation says GRB4:2:2 is supported but I don't see any configuration registers supporting it. Is it enabled by an undocumented...

Wow. Thanks. Looks like most of the posts were doing multiple input and output. If I only care about sending audio to the PC, am I going to hit the problems you describe? Any recommends on another unit that might work better as a multichannel usb audio device?

I have an application requiring PC processing of a set of signals. They are well represented as audio signals and can be processed on a PC using audio software...so, I want to use a Teensy behaving as an audio device to make that happen. I can't tell if Teensy can support outputting more than...

I’ve been doing frequency modulation with a Teensy 4.1 using interrupt code. I modulate a 1khz sine wave on a 40khz carrier by looping through a series of timer frequencies in an interrupt that reconfigures the timer after each cycle. I’m having to dig deep on STM32 DMA, and ran into a set of...

AtTiny1616 units have onboard comparators and configurable custom logic. I need to integrate several of them into a project built around a Teensy. I'd like to use the Teensy to program the AtTinys. I need to be able to configure the registers on the AtTiny to configure the comparators and...

I have 4 LEDs I need to drive. I had previously ran them directly from Teensy4.1 digital pins with the pins sourcing current. I changed to new LEDs with a larger voltage drop and I need to run the LEDs from the 5v USB source into the digital pin as the current sink now. I am unable to find...

Thanks...already tried the search and it didn't look promising. I'll retry..

I have a project where I need dedicated analog comparators with digital output that compare an input with a DAC-generated reference from the MCU. I've been using an MCU with three onboard comparators, a DAC and some useful hardware LUT features. I didn't think Teensy units had these features...

I have a custom keyboard project, and I need to support both Mac and Windows. I need to switch the CTRL\ALT\GUI modifier buttons depending the OS. How can I detect the OS?

This turned out to be a really messed up Teensy 4.1 unit. I switch to a spare 3.2 and everything worked fine.

I had strange behavior on my first attempt at a keyboard matrix. I'm picking it back up, and things are behaving strangely still. I'm using the wiring features here: https://www.baldengineer.com/arduino-keyboard-matrix-tutorial.html I'm using keypad.h with 4 rows and 9 columns. This to be a...

@DD4WH Good info on the transmit power limits. I have some threads going in other forums and informing yourself is remarkably difficult in this case it turns out.

Second lap through google was also unsuccessful. I did turn up references to what you mentioned about vendors simply lying about FCC certification. Good info.

Interesting. I was aware of no rules forbidding data transmission. Where can I read?

I'm still confused on the legality you're referring to. All that is required is sending stereo audio. Although I2C is bi-directional, its not required in this case, so stereo FM works

I don't follow. You can get low power FM transmitters that are legal. They go about a block on an empty station and to the next room on a populated station. Am I missing something?

I have an application where it will be cheap and convenient to use a low power FM receiver to manipulate a remote unit. The remote unit is to be cheap and low power. I'm looking into using a stereo FM channel to supply I2C signals (SCL\SDA) to a set of peripherals so I won't need an MCU...

It appears that the multikey press code is causing the funny behavior. I used the customkeypad example and it didn't mess up the way multikey did. I didn't put the rows or column pins in any order with respect to the wiring. Is there any chance the multi key press code is scanning in some...

The plan is for super low power using no amplification. For FCC compliance, my reasoning is that Teensy's PWM only goes into hundreds of MHZ. At those frequencies, the transmit limit will be well above what the Teensy can drive off of 3.3v. I already use optical comms for similar work, but it...

Ok, so it just got weirder. I swapped the pins IN CODE for rows 1 and 2. The physical row that failed before now works, and the physical row for the previously working row 2, now fails the same way row one did. Unless, I'm mistaken, there need not be any physical\code ordering of the rows and...

I removed the pin config lines and it doesn't change behavior. I'm running out of diagnostics looking for the short...

Yes, the AMR DWT cycle counter is exactly what I'm looking to capture.

I recently had a disaster attempting to use buttons. I found I can wave my hands at the buttons and the RF noise could trigger a swarm of interrupts as if the button was mashed. This is useful behavior in other contexts and I have questions. I have applications where I've been using FM radio...

I have an application where an swarm of interrupts will hit a set of pins. The application is to communicate timing data over the air as finely in time as possible. I need to log the CPU time for the interrupts on each pin...but they are closely spaced in time and can hit during the same clock...

Here's code and more data: The problem is with row 1: Using pin 4,27,26,24:* '4' comes through ok. 3 does 3 and four 2 does 1 and two. 1 does 2 and 3. Using pin 25, 3 and 4 behave properly. 2 does 1 and two. 1 does 2 and 3. Using pin 12. 4 behaves properly. 3 does 3 and four 2 gives 1* 1...

I have a keyboard matrix that is 4 columns and 6 rows. On first test, I had two columns where pressing keys activated two different keys on the column. I couldn't find any wiring issues, so I changed what pin the malfunctioning column uses...and got different behavior. I found a pin where one...

I have a Teensy piping sensor data to MATLAB. The Teensy has enough processing power to handle the sensor processing, so I want to use MATLAB to generate the processing code and then port the code to Teensy. MATLAB has built-in features for this, but they take over the programming entirely and...

That will NOT work. Those units are incredibly frustrating in hiding the fact that they cannot be used like this. I switched to using the OV7670. It should be able to accomplish close to what you're looking for...as long as you're not using MATLAB to read the packets. It apparently has a...

Unless you need better performance, the library works as-is.

Thanks for the in-depth replies. 2.2ks went in the design today...

I have been using the Adafruit Teensy Feather Adaptor as a convenient breakout board that also has a lipo charger. The charge circuit handles the USB\VIN switchover so the USB\VIN solder pad does not need to be broken on the Teensy. I need to a make a custom PCB and need to clone the charge...

I want to use a BT4.0 dongle and I need to source a known-good unit. Is there something current? Also, I'm going to be experimenting with the BT4.0 dongles to see if they can be used with only 3.3v instead of 5v supplies so a variety of units would be best. This lets me use an existing 3.7v...

I went here: https://forum.pjrc.com/threads/49358-T3-6-USB-Host-Bluetooth?highlight=USB+host+bluetooth The only GOOD unit for BT4 is a dead link.

I'm using I2C on a Teensy4, with two MPU 6050s on each bus. In that config, the recommendation is only a single 2.2k pullup on both SDA and SCL?

I'm working off of EagleCAD files from an Adufruit breakout and they're basically the same as the doc. The pull-ups on the breakout design are behind level shifters. Since I'm going to use Teensy's 3.3v regulator and 3.3v logic, the level shifters are not needed. This leaves just the 10k pull-up...

That was my reasoning as well. I'm still in the process of selecting a good BLE 4.0 dongle for this. There was a table from an old thread but the links are dead now. Any pointers appreciated.

I was planning to use USB host mode on a portable unit in order to use USB BLE dongles for easy communication. I forgot about the 5v requirement. The battery only gives 3.7. If my goal is to operate only a BLE 4.0 dongle, is there any chance this can still work?

I need to integrate MPU 6050 units on a custom PCB. I am working backward from github EagleCAD files. I am going to run the unit tightly coupled with a Teensy 4.0 and I need to iron out exactly what components can be removed. I'm not using the Stemma connectors, so those can be removed...

Thanks...I'm seeking to use Digikey. My only search criteria is maximum working height between 12.5. and 12 mm. They have 12.22 and 12.20mm. The two resulting gives two different units...I guess one is spring loaded on both sides. The other is only loaded on one side, but has a much longer tail...

That still leaves me short on exact search criteria regarding dimensions. I have sources, I just need know exactly what to get.

I want to use the USB Host and under-side solder pads on a Teensy 4.0. Available breakout boards use pogo pins per this link: https://www.pjrc.com/breakout-board-for-teensy-4-0/. I have not used these components before and I have questions: 1. I need to reconcile the PJRC directives regarding...

I need to shrink a design that uses a Teensy 4.1. I need to change my PCB from using the through-hole header on the Teensy 4.1, to linking the Teensy 4.0 solder pads to a new PCB. I'm looking for best practices and links to good projects. Any help? [Edit] Pogo pads are a better solution.

I can see an old list of known-good USB dongles. I'm looking for a known good BT5.0 dongle, but the ones in the list are listed as not working. Is there an updated list?

Wow. Between this and the below it works now. Thanks for the help.

I added a 10 millisecond delay and it it helped. I now see the full file play the first time and no static. The second attempt still does nothing. The third is not reached. I get nothing on channel 1.

I formatted the SD card and tried one of the files posted and it did almost the same thing. This time, the file quits playing after a fraction of a second, then garbage for a second or two. (The file is over a minute long.) I cleaned up the code to make it minimal. What else can I check on...

I'm making a soundboard that plays a file via the onboard DACs, but WAV playback from the SD card is behaving very strangely. I have full code below, edited down to a simple test of playing one file. When I run the code, a portion of the file is played followed by a section static on channel 0...

Windows 10...and no, nothing else was plugged in.