D
Reaction score
2

Latest activity Postings About

    • D
      domingo replied to the thread LED PWM without resistor.
      Thank you @sndsgd, I'll take a deeper eye into neopixels but now I want to keep it really simple and I'm struggling with the code. I need some 'delays' because otherwise blinking goes too fast. I want the LED combination to stay ON for a while...
    • D
      domingo replied to the thread LED PWM without resistor.
      For the record. I managed a simple VUmeter with the mentioned 3-pin common anode red/green LED. Each pin connected to an analog pin output of the T4, with series resistor. Red-led with series 2K, green-led with 200ohm. Total current across the...
    • D
      domingo replied to the thread LED PWM without resistor.
      Amazing. Thank you Paul. Checking my boxes I found some 3-pin red/green in 3mm. But they are common anode. Can I use them with PWM intensity control (analogWrite) anyways? I‘m thinking I could connect it to three outputs in the Teensy, with the...
    • D
      domingo replied to the thread LED PWM without resistor.
      Thanks MarkT to clarify that! I didn‘t know about neopixels, very interesting. I‘m looking for something in the traditional LED format though, it‘s easier to mount for me and smaller. Ideally in 3mm, but all RGB‘s in traditional ‚light bulb’...
    • D
      Hello, I noticed that it is possible to control the intensity of a LED using PWM: https://www.pjrc.com/teensy/tutorial2.html Is it safe to power an LED without resistor if intensity is set to low? Or this could eventually burn anyways the LED...
    • D
      I just placed a 1000uF decoupling cap at the 5V Teensy VIN and voilà, the tikitik is gone :) Long time with this problem, asking is needed sometimes to get clues and organize thoughts.
    • D
      Welcome @defragster ! I recorded the noise and it sounds like some CPU writing activity. Likely generated by the SD card itself as you suggest? (if you have a minute, please check this mp3). I tried enlarging the flex cable and moving the card...
      • IMG_5207.JPG
      • IMG_5210.JPG
    • D
      That's a clue! Maybe it is just EMI from the 24MS/s clock polluting by nearby analog circuits, but it doesn't make much sense that it does so 'in intervals'. I assume EMI should be constant. Also the clock speed doesn't change with changes in...
    • D
      Thanks for the lights @h4yn0nnym0u5e ! At the moment I cannot share the system diagrams and details, but I will as soon as I can! For now just another question. As I increase the buffer size the tik-tik-tik increases in speed. Shouldn't it be...
    • D
      Thank you for the info @h4yn0nnym0u5e. I listen with attention because moving to the 4.1 I would need to make quite dramatic changes to my chassis concept and PCB layout. Would it help/work if I install a separate 3.3V VREG for the SD Card...
    • D
      Thanks Paul! I thought I had a T4.1 but it doesn't start.. now I remember I fried it some time ago :/ It's a good advice, I'll need some time to get another one and fit it somehow for a test at least. You made me think that it might be a...
    • D
      Hello, I added a socket, flex cable and SD card socket to the Teensy 4.0, to record audio files. Normally I'd have used the Teensy 4.1, but it is unfortunately too big for my PCB. Problem is that every ~second I get an interruption, like a...
      • sdio_clk_pull-act_150MHz.png
      • IMG_5205.jpg
  • Loading…
  • Loading…
Back
Top