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    • S
      I could include them all..... but there are potentially quite a lot of them. I think that is what I will have to do
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      Hey all So, you usually include the libraries you want at the start of your code. I have a Teensy 4.1 that you can add stuff to 'on the fly'. But, this then means the library for that added on feature isn't there. I don't want to include all...
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      As usual... it no worky I have an ILI9341 2.4" screen. I can get that working with the standard ILI9341 library. The touch part however is done using 4x Pins, 2 of which are analogue. My touchscreen has 4 pins (taken from the data sheet) YD...
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      Hello all I have been tinkering around with a DIN rail mounted 4.1 system and it is actually coming out quite well! The main CPU module has the 4.1 in it with a 36 way bus that runs the length of all the slave modules. It incorporates a...
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      Am I missing something here? Every schematic of an Arduino Mega I have found so far has the USB circuitry missing? I was going to stick a CH340 on my board for ease of programming, but Digikey says they are obsolete. Hmm. Wondered what the...
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      Well I basically plan to load a butchered version of the Fastled Demo100 example + some basic illumination commands and then send over the base commands. These could do achieved with i2c, Serial or SPI. I imagine SPI is fastest.
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      Anyone used an ATmega4808? https://www.digikey.co.uk/en/products/detail/microchip-technology/ATMEGA4808-XU/10444924 Cheap as chips and 'possibly' good enough as a slave processor to do nothing but spit out Fastled data Not as much memory as a...
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      Yes, I tried pull downs. Didn't make much difference. The random data was actually all over the string of leds at random points. This I think could work in maybe batches of 4. I think 8 multiplexed LED strips is pushing it and doesn't allow...
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      Thought I had a 74238 demultiplexer but can't find it... Found a 74HC4051 Multiplex switch which seems to work. Whether it is 'as good' I have no idea. I can drive 4x rolls of 300 WS2815 RGB leds using a NeoPixel demo, and switch the data...
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      Trouble is.... I have never programmed a Pi Pico. So I have a large hurdle to overcome before I start No.... not 70,000 leds! 8x Strips of a maximum of 300 per strip. SD card an memory are used. My 'Bus' runs through all the attached...
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      I think I have 2 options here then. A dumb controller that effectively controls the strips if the required output is slow or not complicated (lots of chasing, fading etc). The other option is an ATtiny as above, programmed with as many output...
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      Starting to think maybe an ATtiny such as this set up as a slave driver may work better... https://www.digikey.co.uk/en/products/detail/microchip-technology/ATTINY3224-SSU/15520488 I think this could handle the strip control. At 76p, you could...
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      Yes, I had thought about a multiplexer approach. I quite like that idea. I have some 74238's in my workshop.... time to breadboard From what I read there, cs2 and cs3 need to go to ground, with just cs1 as the data in. I can reduce my pins...
    • S
      I will investigate. Thanks
    • S
      SteveSFX replied to the thread Two audio boards on a 4.1.
      Ah OK thanks. Yes, the changing i2c address is probably the biggest issue then (as in... not possible )
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      Hi people Is it feasible to run 2x Teensy 4.1 audio SGTL5000 boards off the same 4.1? I know you can't 'stack' them, but is that just asking too much of the processor and with too many shared pins?
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      Yes I did think of halving the amount of control by doubling the length of the strips (so one set of command effectively controls 2x strips of leds). Not sure what the max length of Leds is. I will have to investigate. I am thinking of...
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      Hey all My 4.1 has 3 or 4 spare pins, but I now need to control 8x strips of 5M RGB leds. Can be NeoPixel, Fastled.... whatever, but I am short of pins. Any ideas? Wondered if there was any way maybe of sending the data to a remote IC and...
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      SteveSFX replied to the thread Changing the volume pin.
      Yea... ha, just realised that and just looked at the code "Part_1_05_Do_More_While_Playing". I thought maybe pin 15 was tied to the library but it appears not Thanks
    • S
      SteveSFX replied to the thread Changing the volume pin.
      I am not piggybacking the PCB for that reason. It's where I change the pin allocation in the Teensy audio software. I'll poke around some code later
    • S
      Hi all Is there a way to change the volume pin on the Teensy 4.1 audio board from Pin 15 to another analogue input using software? Or, do I need to change that pin (if possible) in the library Pin 15 as the volume uses up Serial3 and I need it...
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      Hi all. I have a lovely 9 way DIN module here, and I planned to use it to make a stereo LM1875 amp with it. Searched around, found loads of circuits and I don't think I will have too much issue there. But the power supply has me stumped. I...
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      I have searched extensively and not found a better connector that fits in the enclosure. The connector is rated at 2.6A. JLCPCB traces are default 1oz, which I believe is 35μm copper. My link traces are never longer than 50mm. From this...
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      Hi all I have a 36 Way PCIE connector that I am using to link some DIN rail modules I have designed for my project. They are very nice but I am struggling with actually linking the pins! The modules link with a small double sided, keyed link...
      • Din rail bus.png
    • S
      Ah OK, many thanks Paul. That is handy to know
    • S
      Thanks Paul. Can I ask what the pair of solder pads on pins 7 & 8 are for on the Teensy 4.1 audio board (Din and Dout). What reason would you cut them?
    • S
      How easy is it to change the CS pin for the SD card on a Teensy 4.1 audio board? Is it a matter of declaring a new pin at the start of the code, or do I need to change it in the library?
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      OK, With a ground plane and 100R on the MCLK, we seem to be fine. Has the SGTL5000 been superceded? I was hoping the 32 pin version would come back for i2c address reasons, but it's now listed as obsolete in Digikey. SD card... I assume that...
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      Hey all I have a project where the Teensy 4.1 is in one enclosure, and the audio board is going to have to live in another (along with an amplifier). The enclosure that houses the Teensy is just too small and cannot be changed now. This I...
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      I will have a go at getting the pots to work, then attempt the TFT screen Thanks again for the advice
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      Thanks Paul. I have ordered one and I will see how we go. I am using this to read simple pots. Nothing exciting. But do you think one of these would work for reading a TFT touchscreen? I have 4x analogue pins assigned to my 2.4" TFT screen...
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      Drives me mad. Been hours trying to figure out unclear data sheets. The whole point of the sheet is to give you the information you need! This company do samples, so I have requested some so I can check this before I get the PCB made.
    • S
      Hi all Just designing a PCB and need some dual stacked leds. Want to use these, but the data sheet is useless. Which pins are the cathodes? I 'think' its the one nearest the rear sloping case, and the second one in from the other end? Dual...
      • Leds.png
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      Thank you Paul. I will breadboard this and give it a whirl.
    • S
      Hello all Trying to make my wiring a bit tidier, and I would like to convert some pots I have to be read by the following Analogue to I2C device...
    • S
      Sorry.... getting tired. Yes, I meant the SPI interface. Weird. The data I found said TX was the CS. Doesn't matter, both are brought back to the Teensy anyway It REALLY annoys me when neither the data sheet (that I can find) or online...
      • 2.jpg
    • S
      OK... The Serial TX pin appears to also be CS
    • S
      Does it not need a CS then? How do you tell the WiFi module you wish to talk to it?
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      Am I missing something with regards to the Seed XIAO ESP32C3 in post 1... I see Miso, Mosi and SCK. Should there not be a CS/SS as well? I also see it has RX/TX Maybe the best way to use this is just throw serial data at it and ignore the SPI...
      • pin_map-2.png
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      Ha... I didn't even notice that had both Bluetooth and WiFi! Just as a side question for the same project.... I am trying to find an SMD mini piezo. What spec does that need to be for direct drive off the Teensy 3.3v pin? I found this...
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      Thinking of adding WiFi and Bluetooth to my Teensy 4.1 project. For the WiFi I was thinking of an ESP32C3 https://thepihut.com/products/seeed-xiao-esp32c3 Any ideas for bluetooth? A combined Bluetooth and Wifi would be great.... I'll have a...
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      Out of interest..... what trip and hold current would you specify for the 5v and 3.3v supplies? I have: 5v @ 1000mA 5v @ 2000mA 3.3v @ 1272mA I picked 1.5A Hold and 3A trip (in 500ms) for the 5v @ 1000mA and the 3.3v @ 1272mA I picked 2.5A...
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      I have a decent quality Vigortronix 5v PSU and yes.... I added PTC fuses on both the 3.3v and the 5v lines. Thanks for the advice
    • S
      Hmm. OK. My external host USB device needs 1.1A Maybe I could use the VHST signal to switch a Mosfet?
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      Now.... just so that I am not going mad.... I want to add a couple of DIP switches (if I can find some decent rated ones) to control the +5v supply to the Host and main USB ports. I believe the host USB port on the Teensy 4.1 is limited to...
      • PSU layout.png
    • S
      That's fine. Thanks Paul
    • S
      Am i right in thinking that when I add a Micro USB for the USB host ability, I only really need to run D+ and D- to the USB port? This is because I have obviously already got ground connected to the Host USB socket locally, Pin 4 is unused, and I...
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      Thank you Paul. That is why I asked, it didn't seem prudent to feed 3.3v to the 3.3v pin. Nice idea regarding the 24C02. I will have a tinker. Thank you for the advice! Oh... what is the supply of 4.1's looking like? I spent FOREVER...
    • S
      Hey all. Still designing this DIN module and a couple of questions. First: Power supply. I have a 3.3v @ 1.2A and a 5v @ 1A available to power my Teensy 4.1v. Normally I just pile the 5v onto the VIN (I know all the pins are only 3.3v)...
    • S
      Thanks all for the great ideas. Thanks for the cad BriComp.... appreciated. I will tinker with my options
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