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  1. Replies
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    I tried this library and the display is white. I...

    I tried this library and the display is white. I did not change anything in the INIT lines because it is over my head :)
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    This ...

    This is the one I bought. The silkscreen on the back is a little different, but the placement of the parts is exactly the same.



    Thank you KurtE. I made some progress with the library in the...
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    After much searching, I think I have found the...

    After much searching, I think I have found the actual LCD used in my display. It is this one (the 42 pin version).
    It says there that it uses the R61581 driver.

    Is this a discrete driver? Or the...
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    Thank you for this information. I have done this...

    Thank you for this information.
    I have done this but the display is still white.



    I don't know what you meant by


    Where in the files could I find these commands?
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    Thank you @mjs513 I have downloaded your library...

    Thank you @mjs513
    I have downloaded your library and used the graphicstestKeDei sketch. However the display is still white.
    Here is the code I used:
    ...
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    3.5 inch RPi LCD with Teensy 4.0 problem

    Hello.
    I want to use a 3.5 inch RPi LCD + Touchscreen with the Teensy 4.0. The display can be seen here. I know the page is not in English, but I could not find something else. At least, you can...
  7. Wow. Good job. I want to use this. But since I am...

    Wow. Good job. I want to use this. But since I am a bit new to GitHub, could you tell me how to actually download and run your simulator? (Sorry if this is a stupid question:) ) Thank you very much.
  8. Thank you very much for this information. I...

    Thank you very much for this information. I really haven't thought about he thermal considerations until now. I will try to change the PCB design to incorporate the TO220 package in the next...
  9. Thank you KurtE for the information. The lab...

    Thank you KurtE for the information.

    The lab power source can provide up to 20A of current.
    Those converters are indeed a bit overkill for my project.

    Doing some more testing today, I...
  10. The vias were supposed to connect on the bottom...

    The vias were supposed to connect on the bottom layer with a solid region the sizes/shape with the one on the top layer. But I made a mistake and did not include it in the gerber sent to the PCB...
  11. Yes. Basically it is the exact holder in the...

    Yes. Basically it is the exact holder in the link, with the exact wires, just for 3 batteries.
    If the batteries/connections to the PCB were the problem, wouldn't it be solved if I connect the PCB to...
  12. The power source is now 2 or 3 battery cells...

    The power source is now 2 or 3 battery cells (18650) connected in series (7.4V or 11.1V total) connected to the PCB with cat6a wires using this and this connectors. I also have access to a lab bench...
  13. I use a 4 layer PCB with the layers GND - GND -...

    I use a 4 layer PCB with the layers GND - GND - 3.3V - GND. The GND layers are stitched together with vias every 2.54mm (where possible). You can see the actual PCB layout here.
    Every component has...
  14. So today I resoldered all the pins that I could...

    So today I resoldered all the pins that I could think of on the Teensy and the PCB. This did not solve the SPI problem.

    However, I now think that it is indeed a power issue.
    Here is how I ended...
  15. This means that instead of using SPI.begin() I...

    This means that instead of using SPI.begin() I just use SPI1.begin()? Or do I have to do other changes too?


    Thank you very much for clarifying this.
  16. I understand now. Thank you very much KurtE.

    I understand now.
    Thank you very much KurtE.
  17. Hello. Did you manage to use pin 27 as SCK? I am...

    Hello. Did you manage to use pin 27 as SCK? I am having the same problem.
  18. Hopefully today I will get around to check the...

    Hopefully today I will get around to check the soldering of the Teensy pins.
    Until then, could someone tell me the exact steps/code lines I have to use to get the SCK pin from pin 13 to pin 27 of...
  19. I have placed on the PCB pull ups on every CS...

    I have placed on the PCB pull ups on every CS line for the devices connected to SPI. 4.7kOhm. Is this too low or to high?


    I will unplug the Teensy and connect one pin at a time with DuPont...
  20. 1. Will check. 2. As far as the LED on pin 13...

    1. Will check.

    2. As far as the LED on pin 13 goes, I don't know if it is too much load for the SCK signal. Could the problem be just the LED? Because I could just desolder it and continue to use...
  21. I will measure this. One more thing: The SPI...

    I will measure this.
    One more thing: The SPI buss stops working only when I measure the SCK voltage directly on the pin of the Teensy. If I put the GND probe on a GND anywhere on the PCB and the...
  22. So I have done some more testing today. - I...

    So I have done some more testing today.

    - I soldered thick wires (from a CAT6a internet cable) from the 3.3V, 5V and GND pins of the LDOs to the PCB (3.3V pins of the NRF24, 5V and GND pins of the...
  23. Thank you PaulS for your input. I checked today...

    Thank you PaulS for your input.
    I checked today the total power consumption of the board. With the Oled and shift lights connected and fully on, the PCB consumes about 490 mA maximum.
    Still I will...
  24. After some time testing everything I could think...

    After some time testing everything I could think of, it turns out that there was some cross talk between the SCK traces and GND somewhere on the PCB. :mad: (This was hard to properly check beforehand...
  25. In post #1 there is a link where you can see the...

    In post #1 there is a link where you can see the actual PCB if you want.
    Nothing is powered by the Teensy 3V3 pins. Everything that uses 3.3V is powered from a 3.3V 1A LDO.
    The I2S pins are...
  26. Commenting out just one of those two lines of...

    Commenting out just one of those two lines of code does not solve the problem. In fact, i think that when I comment out just the i2s2 lines the problem gets worse (more noise on the oled and the SCK...
  27. Thank you PaulS! If anyone reading this finds...

    Thank you PaulS!

    If anyone reading this finds a possible solution please write here.

    Thank you to everyone who tried to help. I really appreciate it.
  28. The power supply for the 3V3 parts is Q1. It is a...

    The power supply for the 3V3 parts is Q1. It is a LDO capable of supplying up to 1A of power. This LDO in not getting hot at all. It is just warm.
    The Q2 5V LDO is getting hot only when I connect a...
  29. So after a few more tests I noticed that even if...

    So after a few more tests I noticed that even if I unplug the NRF24 module from the PCB the problem is still present. A lot less noise on the screen and a lot less frequent, but I can see that it is...
  30. I finally got the time to do some more testing. ...

    I finally got the time to do some more testing.
    This is what I know so far (on top of what I already mentioned in the last posts):


    If I disconnect everything from the U6 connector (including...
  31. I will disconnect everything else but the oled...

    I will disconnect everything else but the oled tomorrow and see if this changes anything.
    The SSOLED, SCK and MOSI going out go to the oled. At the oled side there are two RJ45 connectors so I...
  32. You get that error while compiling because the...

    You get that error while compiling because the i2s1 and i2s2 objects are used a little down the road in the code.
    Commenting these other 4 lines will allow you to compile (but the Audio portion of...
  33. Thank you very much PaulS for taking the time to...

    Thank you very much PaulS for taking the time to test my code.
    It is very weird indeed because I tried just soldering the two MAX31855 ICs and powering the PCB without any code to initialize or use...
  34. Yes. If I do not comment out the two lines of...

    Yes. If I do not comment out the two lines of code in post #6, the oled and NRF24 modules (both connected to the SPI bus) do not work as expected. A lot of noise is displayed on the oled, the NRF24...
  35. Thank you all very much for your replies. After...

    Thank you all very much for your replies.
    After spending much of today trying to debug this, I noticed something.
    First of all, here is my code: (I know it is quite long)



    /*
    31.07.2020...
  36. I am pretty sure the CS-t1 and CS-t2 are handled...

    I am pretty sure the CS-t1 and CS-t2 are handled properly. I say this because the glitches appear even if the software for the second MAX31855 IC is all commented out (the second IC is just...
  37. Teensy 4.1 and 2 x MAX31855 thermocouples SPI problem

    Hello everyone.
    I have a Teensy 4.1 connected to an 4.2" oled and a few sensors. Among the sensors I want to connect to the SPI bus two MAX31855 thermocouples for measuring temperature.
    I have...
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    IT WORKS! Thank you very much PaulStoffregen....

    IT WORKS!
    Thank you very much PaulStoffregen. It was indeed the RX ant TX pins that had to be reversed. Following the revised schematic everything works just fine.

    Thank you all for the great...
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    I just ran the modified sketch and got this...

    I just ran the modified sketch and got this result:

    21128

    It seems that the i2c bus is working and it sees the SGTL5000.
    (The 0x68 address is for the MPU6050 chip soldered in the board.)
    ...
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    After MANY tries to make it work, my setup is not...

    After MANY tries to make it work, my setup is not yet working. I connected the PAD to GND but no change. (When I power on the board I hear 2 very faint clicks in the headphones. When I power off the...
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    Thank you Paul for this information. Could I ask...

    Thank you Paul for this information.
    Could I ask if the rest of the schematic I used is correct? Because it seems that now the SGTL5000 is not working. I will solder the pad to GND, but I would like...
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    Thank you very much PaulS. I will try to connect...

    Thank you very much PaulS. I will try to connect the pad to GND and will report back the results.
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    Thank you very much for taking the time to help...

    Thank you very much for taking the time to help me. I believe the pins on the jack are correct (I have used the Audio board with a previous project in which the jack was connected exactly like this.)...
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    The 2.2k pull ups are placed on the PCB (just in...

    The 2.2k pull ups are placed on the PCB (just in another part of the schematic).
    I think the I2C bus works because I have a MPU6050 chip that uses I2C also and it works.
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    I just noticed that I did not connect the PAD to...

    I just noticed that I did not connect the PAD to GND. (pin 33 on the schematic above) Could that be a problem?
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    Audio + Teensy 4.1 problem

    Hi all.
    I am building a project using the Teensy 4.1 that will log data from a 125ccm shifter kart and that will also be used as an Walkie-Talkie to communicate to the pits.
    Because of space...
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    Sorry to write in such an old thread but I just...

    Sorry to write in such an old thread but I just wanted to say that I think the problem was that in the IDC connector where all the sensor wires go, there were 3.3V and 5V wires. When working with the...
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    I also had a problem with a Teensy 4.0 where the...

    I also had a problem with a Teensy 4.0 where the LDO was getting hot. I found out that the LDO was just fine, but the MIMXR was burned.
    Check to see if you have a short circuit between the 3V3 and...
  49. Awesome! Thanks! Just noticed 2 small text...

    Awesome! Thanks!
    Just noticed 2 small text errors on the MagJack page.
    20727
    20728
  50. Hi sennert. You can find the schematic in post...

    Hi sennert.
    You can find the schematic in post #7 here.
    For the backside pinout you could check post #658 from here.
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