Having seen your video, nice work! and changes some of my internal pictures that had a ring of glitter lights, not a light wall.
I have a tie with 4*13 LED matrix running up it that would go well with them.
You...
Re drooping under load, yes they will, but they will bounce back up again when LEDs are off. Upside is Cr2032 cells will probably not drive enough current to destroy much. What I would question is how long those Cr2032s...
Looking at your code easy option does not work since the midi send is hidden off in the midi library, not being called by the main loop and no easy way to see if a send is in progress.
So looks like option B, ...
A teensy+prop shield package will not regulate the Vin, which is assumed to be 5V+/- 500mv. So while you can probably power a teensy 3.2 off 6V Vin, and have it regulated down to 3.3V ok (pushing the reg harder but not...
That's the idea
It is quite possible you will find up to 100 volts there, if you do second step is to add something like a 10K resistor between the grounds and see if the you just have capacitive coupling through the...
If you cut the trace, that is only the 5V USB in, you can still program (assuming 3.3V power to run the Teensy is there) but you still have shared ground with the USB data and your power supply ground. It should not be...
It is not impossible to have power supplies with different absolute ground potentials. Before soldering them together it can be a good idea to measure the voltage with a multimeter and confirm something does not have a...
Lots of ways to handle it. Depending on what hardware you are already using easy choice may be pin 13 which already has an LED
In terms of what you drive it from one place may to to turn it on when your Midi stream...
software side of this is not hugely complex, but involve some work taking the movietoserial code and converting it to SPI transfer which is after all still just a stream of bytes, probably using the existing sync pin...
For what it's worth, dotstar are technically SPI. You can run them on lower voltages but the blue and green start to loose intensity against the red. While 4 1.2V batteries directly to Vin can work a better solution...
Looking at an actual data sheet https://www.omega.com/manuals/manualpdf/M3813.pdf to find some numbers, in theory it should work. Key thing and missing from the docs is what current the thing draws from a 3.3V logic...
Decoupling matters the most for chips that have widly varying loads, so noise from within the chip does not propogate as varying VCC to other ICs, and as free bonus stabilizes the supply to the IC. So normally priority...
All these ethernet modules use SPI with the library supporting a range of modules, so the linked page has most of the information for physical connection, also see
https://www.arduino.cc/en/Reference/Ethernet
To get...
Also potentially helping to get things slowing more smoothly would be something like ellapsedmillis
https://www.pjrc.com/teensy/td_timing_elaspedMillis.html
Cut down the serial sends to once every second or so to...
Exactly which library is used can make a difference here. I ran into a similar issue with incompatible SPI settings and needing to call the display/ethernet begin functions between uses. Need to find my notes because...
Unless the original user code added it as a feature it is supposed to be pretty hard to pull code from a teensy. Certainly the USB bootloader does not include it. Are you luck enough that a look at the ino indicates...
Notice the LEDs per strip is divided by 8, so those numbers are assuming you are feeding 8 strands, not a single strand with the other 7 inactive. I think you need tell it you have 8*8 columns as if you had 8 of these...
Given the $ cost of the total project a couple of co-processors is probably the way to go. The Teensy3.6 can probably do all these things (see the C64 emulation project) but theere will be a whole bunch of interaction...
Re line level see https://en.wikipedia.org/wiki/Line_level, your camera manual may have some information where it just talks voltages/impeadances that or very similar to that. Your camera is probably using the levels...
Suspect because the DMA hardware that makes OCTOWS 2811work does not support 24 bit memory use in 32 bit memory structure, it will just be trundling through memory space and producing the required waveform as it goes.
This would be your problem:
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
It is waiting for a serial port to connect, and that will not happen on battery
@ Xeyow - a more meaningful test is to build up as much of the other hardware as you can and use a resistive divider to measure approximately half 3.3V. Exactly what doesn't matter but take a bunch of samples and record...
Friction fit anything is never great in anything doing shock loads. You probably need to either buffer through the event and the init the card once motion has ceased or look to soldered in flash. Is there any indication...
There shouldn't be a way to make this work since it would allow arbitrary code execution from a USB device. Not saying it is impossible just that you would be working past security features to do it.
To get more out of the ADCs you probably want to go for cyclic reading using
https://forum.pjrc.com/threads/25532-ADC-library-update-now-with-support-for-Teensy-3-1
Possibly on a pin that can be read by both ADCs
...
Re your last statement, you can't, short of having something like a parrallex propeller with dedicated CPUs. What you can do is have a look at how the interupts are interacting. Have not looked at the timer code myself...
Unclear on your geometry for flipped here, but yes you will need to get things so pin one lines up with pin 1 etc. which goes on top does not matter, but the RJ45 jack will pretty much force the issue I suspect. Other...
What pin does your code use for chip select? Looks like the adaptor is wired for pin 10 which I think is the same as most of the examples. The other possible difference is the handling of the reset. The adaptor board is...
Yes, the time set by the code is compile time, not download time. I think it is also possible to manually type the time into the terminal window but the processing solution sorts all the formatting side out.
If...
Your maths is right on the current, so you will need to size the conductors right. You will certainly need something to tame the 12V down to something for the rest of the logic, normal solution there is a small switch...
A google suggests plenty of commentary on SD card latency such as
http://chipkit.net/forum/viewtopic.php?t=3035
Experimenting with other cards may help a bit but you will always have a controller in the middle so...
Generally the generic arduino libraries will work on Teensy unless they go deep into the weeds setting AVR specific registers. The Teensy libraries often have changes make use of the hardware support and or 32 bit math...
The Teensy encoder library automatically uses interrupts if available. If performance is provable such an issue that you need more interupts you should probably look at a more capable CPU. Unless you are making 10s of...
If you look at your last drawing and draw the voltages seen by each LED it will be pretty clear what is going on.
What you need to do is time share the LEDs. So if you set the column pins for one row, enable that...
Posting your actual code will make this clearer, but SD cards can have a mind of their own when it comes to how long a given write will take due load sharing and other activities by the SD card CPU. If this is the...
Unless your goal is to handcraft an encoder library probably easier to use:
https://www.pjrc.com/teensy/td_libs_Encoder.html
and follow the table there.
At 320*240 on an SPI display can get ~10 full frames a second, Which is responsive enough for a UI but pushing it for video. Also means you have to be careful with drawing order to avoid flicker. Does do partial re-draw...
Loading the wrong firmware would certainly have ended badly since they would have been trying to set configuration registers for an 8 bit chip and this would have done all sorts of strange things to the clock and USB...
What you want to do is certainly achievable, and would happily run on a Teensy 3.2, though that does leave you needing an SD card input.
Bluetooth audio is going to be a long route unless you buy a comercial module...
Something is up with the mic module, since as per the produce page it as a 1/2 supply bias value so the quiet reading should be ~500 and your other link suggests ~200 readings. You may need to revisit the mods you did...
The Teensy can operates without the bootloader though would be a rather brutal process to remove, and there are lock bits in the CPU in various combinations since regardless of how it is used in the Teensy the core is...
Possible options:
Light or colour sense the track looking for markings
Using IR remote library to have one or more senders trackside + IR rx on the cart (strong sunlight will mean big LEDs)
Ultrasonic sensors would...
There is certainly not much matching between the video and the code. Does it ever actually print numbers? The number print should line feed so looks like that line never executes.
Can you post a photo of the board,...
You can probably make the PI do this directly via a USB microphone but if this task is to write code for a Teensy then you look at
https://www.pjrc.com/teensy/td_libs_Audio.html
and the tutorial video or power point....
In file->examples->SD <-- the one under teensy if you have more than one showing up
there is various examples, including read/write
At the top of that there is
// change this to match your SD shield or module;...
You do specify featureDemo but it this case it matters what was supposed to be displayed for a given wrong pattern, since you mention a square which indicates not purely random. Cutting it down to say a single colour to...
@ ivan - create a new thread with your question rather than polluting this one,
It will be easier to read if you use the code tags make the code more readable
like this - by pressing the '#' button in the menu...
If you are looking at making a custom product using teensy there are various threads on the topic but to answer some of the possible questions:
You will need a PJRC M0 bootloader chip with magic sauce -...
That is pretty much it, with minor thing that the main CPU is the thing that actually downloads the code and writes to flash not the bootloader IC, it just stores the code.
When you press the program button or...
As long as you stay under the 100mA limit, that should work. Issue with 3.3V usage is that the regulator is inside the main IC, so it does not fail gently under load and when if it does fail you need to ditch the board....
The pin 17 5V output is the logic output from pin 17 level converted up to 5V and current limited. If you want control of the LEDs better option would be a transistor on the low side controlled from a pin. If you just...
Unsure on the gain, but suspect a more meaningful limit is the 16 bit processing path without an analog preamp. Good place to start is the tutorial video, the associated power point or just tinkering with...
Depending on what you are doing with the data and the fade rate of the light but in addition to tweaking gain would it work to run illumination at a rate and then high pass filter the result to strip the DC component....
At least initially would be a good idea to install Arduino and Teensyduino. Even if you don't program from there this will prove that your hardware does in fact work before getting too deep into the weeds along with a...
Assuming the actual IC is ok you can probably do the 'uno as ISP' thing and program that way, but that looses a lot of the Teensyness. If you think you have a phony, compare it to the PJRC reference card photos looking...
The Yellow pins include A11 and A10, which are shown as not connected and Aref, which is connected but will only be doing things if your code actually switches to external reference...
There are a number of ways to get more IO
https://www.evilmadscientist.com/2010/on-the-design-of-the-bulbdial-clock/
https://www.pjrc.com/teensy/td_libs_Keypad.html\
https://www.adafruit.com/product/593
And many...
Are you using the onboard SD card holder, or an external breakout? The internal one uses dedicated pins so leaves your normal SPI pins free. If you are using a breakout then you can use any of the the chip selects for...
That looks like a reasonable setup as long as your signal is pre-amped to line level already, which greatly simplifies many things if so.
If trying to handle periodic display updates or user interface an easy way to...
For what it's worth you can run anything you like across and RJ 45 plug as long you do not exceed the voltage or current capabilities, but equally have said very bad things about engineers in the past who have used...
Yes, the examples are outputing to serial and various flavours of LED. One thing to look at while wiating for your teensy to ship is what your input will look like. The audio library offers various options to get your...
If using the SPI ethernet modules like the W5500 it would certainly be possible to use different chip selects and manually pass the data onwards but would be complicated and you would be needing to manually bridge the...
It is certainly possible and Teensy 3.6 would probably be overkill except for the PWM outputs. Using a T3.2 + a PWM driver (or just whatever duino you have hand via serial) could get the number of pins you want. If you...
Can confirm encoders+audio works since I have several projects using them, suggest posting a cutdown example code, and confirming that you are using the Teensy optimised encoder library.
Working across the internet there is a limited amount to be done. Confirming what you posted before, the Teensy works and blinks to itself with no prop shield connected, with prop shield computer drops out because of...
Unsure on the display library, but the Adafruit one should work - key thing is that the SPI bus speed is probably what controls the refresh rate, and that may be limited by the display rather than the Arduino. Basically...
Unsure if there is a better write up, but I think changing interrupt priorities would do what you want:
https://forum.pjrc.com/threads/26397-Interrupt-priority-for-attachInterrupt
Idea being you lower the...
Should be fairly safe that D+ is D+ but a sanity check comparing continuity inside the USB jack when plugged in and on your new soldered cable will provide insurance against anything odd in your donor cable etc.
It...
As noted in the various links above it is certainly possible, The teensy LC reference card shows the pads on the under side you can go to. Just be careful not to rip the pads off in the process....
The higher losses will probably be in the metal to metal contacts, especially if you end up with a corrosion layer in there which can make life interesting as each time you take it apart the results change. Working out...
If it's an unknown LED problem may be worth pointing fastLED or adafruitNeopixel libraries at the strips. Both are bitbanging the signal so blocking code and fight over inturupts but having more setting options may give...
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