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pgu:
did you not see this rule at the top of the page?
Forum Rule: Always post complete source code & details to reproduce any issue!

Nobody here can help you with the information you have...

Spyy:
I guess I am dating myself.
His name was Johnny Carson, and was the Host of the Late Night TV talk show called "Tonight".
This was one of his most famous comedy sketches started in 1964....

onlydcx:
Their are a lot off very smart people here on this forum, however nobody here is this guy:

27892

Please read the Forum Rule at the top of each page.
This problem you describe could...

Mag:
It appears that the sensor board you are using has the SCL & SDA pull-ups onboard, which is good.
However it also appears that that sensor board has a voltage regulator on board which usually...

Blake:
I glad you have solved your problem.
Both Mark and I have pushed you to learn more about the innards of working in this domain. This has been the goal all along, because if we did it for...

Blake:
Regardless of what I or Mark have to save about circuit design techniques, without a detailed schematic and most probably pictures of your setup, solving this or any other unwanted noise...

Blake:
Just to start, the NE5532 was a pretty good Op-Amp in 1979 (I remember it well), but by todays standards it is JUNK.
5 nV/√Hz is not considered low noise, and a CMRR of 70 - 100 dB is not...

carl0s:
Before you progress further I would suggest you peruse the Web page for this IC (Instrumentation Amplifier) at https://www.analog.com/en/products/ad8428.html#product-overview. On that page...

AlainD:
You already seem to want to use a MOSFet to control the fans speed. Why not just add an inductor and a capacitor to the output of the MOSFet and feed the input from the Teensy with a PWM...

Seattlebiker:
If you would like to see the whole project code, you can view it in its Github location:

https://github.com/sbfreddie/Master_Weather_Station

Regards,
Ed

Seattlebiker:
I wrote this code about 10 years ago for my Weather-Station/Clock project. This code has been running continuously for a very long time and only stops when the power goes out, but...

AlainD:
Perhaps you should consider looking into the Teensy's PWM output. There are a lots of threads on this forum concerning PWM on Teensy.
With PWM you could choose which ever speed you would...

grinch:
The resistor and LED to ground is not a pull-down. The IV curve of a LED is not the same as an ordinary diode. I am not sure which type of LED Paul used but the forward on voltage for a...

AlainD:
Your idea might work but, since you have not told us what type of fans, which LED, what is driving these circuits, and the voltage and currents involved it would be difficult for anyone to...

Hajo:
I believe the Arduino Mega is a 5V device, and I know the Teensy 4.1 is a 3.3V device. Did you compensate for this difference in the hardware?
If not you may have let the smoke out of the...

Seattlebiker:
I much prefer the DS3231 or the DS3232 over the DS1307, as the newer ones (3231 and 3232) both have builtin TCXO's (Temperature Compensated Crystal Oscillators), which makes them...

Grinch:
I far as I can tell the HC245's input on pin 18 is floating (tri-state), as I believe that the Teensy pins are in tri-state mode until you specifically put them into input or output mode.
...

rmills:

You are correct about the SPI only, the reset pin is optional for the SPI interface. I was confusing this display with another, as I have never used the 5.0" TFT. Mine are all 7, 8, and...

semielectron:
You are going to have to give us more info to help us help you. A Schematic of your circuit would be a good start. Please read the forum rule at the top of the page!

Regards,...

Hermit:
Probably not brilliant, but certainly experienced with 2/3rd of Century of experience. If you turn over your cell phone and look at the Camera and realize I worked on the Team that invented...

Hermit:
I think you have finally got it! Yes the Teensy 3.6 has 4 separate I2C busses (I don't have one the T3.6 pinout cards in front of me). Each one is declared separately:
...

rmills:
Where should I start, there are so many problems with this design it's difficult to even start.
1. Why are you using 5 different quad Tri-state buffers. Don't you know the there are 4...

Hermit:
I think I did not make myself clear concerning I2C Busses. If there is a conflict using one of the I2C busses, I suggested to use another BUS! (That is Wire, or Wire1, or Wire2), then...

Hermit:
In your first sentence I think you meant to provide a low impedance output for the audio shield as Op-amps generally have high impedance input and low impedance outputs. Generally a...

Why not try a fairly good op-amp circuit, you could easily apply a DC offset to the opposite input to offset the output to just about any voltage you like. This is a trivial circuit to implement and...

dprife:
Your problem sure sounds to me like a serious power problem.
When I say power problem I am referring to current and voltage spikes on the main AC lines that feed your power supply(s). ...

heimi:
You do know that embedXcode support was discontinued quite a while ago? It seems the newer versions of Xcode were causing all kinds of problems with the developer.
I had all kinds of...

Lankanmon:
Ahaaau, the USB cable problem!!!! Beware of cheap USB cables. Most of the USB cables on the market today are absolutely garbage.

I you got your teensy from PJRC it may or may not...

Lankanmon:
The crimp pins I was referring to are for the .025" square pins that are commonly soldered into the Teensy board. You crimp these pins on the end of your wires and either put shrink...

I would also question why you would use such large wire on a project like this. The Teensy is not capable of sourcing or sinking very much current so the use of 28 - 30ga kynar insulated wire would...

All:
This is the best example I have see in a long time of terrible soldering work.
Notice the large solder blobs on the Teensy pins which usually indicates a bad solder joint.
Notice the melted...

easone:
I think this would be a great addition to the Teensy's libraries.
I have been reading this forum (Every Posting) for around 10 yrs and have found many different applications that could...

Jetsream:
You could use either a resistor divider, or an Op-amp with negative gain. So keep in mind that most of these A/D's do not have buffered inputs so they like to be driven from a low output...

Why is this output spewing out SPI info when the Teensy 4.1 does not use SPI?
It has its own internal QSPI so even including SPI for this board is just a waste of code.

Regards,
Ed

RomanP:
You will have to Parse the input string like this:


/*******************************************************************************************************************
* This function...

devanshshukla:
Here is my suggestion to get to the bottom of the challenge.
Start with disconnecting the base resistor from the teensy and connecting it to the other output of your DC power supply,...

@Kiimes:
Look up ENOB (Effective Number Of Bits).

Regards,
Ed

devanshshukla:
Wow that is a high current low efficiency LED.
You need to do the calculations for current thru the LED to get the brightness you want and calculate the on resistance of the...

The IR LEDs were not blinking at all.
devanshshukia:
If the LED's are truly IR how would you expect to see them blinking?
Most IR LED's emit in a spectrum below human vision so there is nothing...

@Jetsream:
In further consideration of your interesting problem, I think I have figured out why your getting all x0FFFF's back from the A/D.
If you look carefully at the MCP33121 data sheet page 38...

After reviewing this data sheet with a finer tooth comb, I agree with WMXZ, this A/D will not work with I2C or SPI. Perhaps some sort of bitbanging or as WMX suggests using I2S which has been...

25591@Jetsream: I found this page at the manufactures website from their custom testing board that costs $200. It appears that the output Dout requires a pull-up resistor, check out this schematic:

@Jetsream:
The CNVST timing is very critical and I don't think the Teensy's CS output from the SPI logic can be precisely controlled to get just the right timing. Make sure you read carefully the...

It depends on the A/D, some devices use a high as an idle state, and some devices use a low as an idle state. I was looking at the data sheet and you should study page 38 very carefully. I think it...

@Jetsream:
It looks to me like your A/D is putting out a signal level on the SIO pin of around 1.8 Volts which the Teensy will not recognize. The schematic you show is very difficult to read, so I...

Parkman:
I just tried your program on my Mac. Same laptop as yours, same OS 10.15.7, same TeensyDuino 1.8.13. Uploaded program 15 times into brand New Teensy 4.0, one after another, NO PROBLEM!
...

Kurt:
I have an app called SyncMate that claims to support MTP on the Mac (MacOS 10.15.7). I have not tried to use it yet, but your development here is the reason I purchased it.

Keep up the...

I would suggest that all the long wires be installed in standard EMT electrical conduit to shield against EMI & Static electricity. Make sure that both ends of the conduit(s) are grounded to a very...

Paul, or any other Guru:
I was reading the Uart section of the K20 Manual today and came across an interesting little tidbit on page 1208 and 1209, concerning an obscure little know interrupt on the...

Kurt:
Thanks,

Ed