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    After some troubleshooting I found the cause why...

    After some troubleshooting I found the cause why it did not run the Blink-A-LED.

    The PSRAM was not working because one pin was not connected to the PICO-D4.

    When the PSRAM is not working, the...
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    Before I tested the LPF I just plugged the board...

    Before I tested the LPF I just plugged the board in a USB port to check it out. It looked OK and nothing was burning my finger. After added a through hole resistor and a cap on the reset pin I...
  3. The LPF works. Finally I got my equipment...

    The LPF works. Finally I got my equipment unpacked and I could use my scope again. The flickering pulse from the charger is about 12 Hz,10% duty cycle, 10% low and 90% high. The 10% low turns on the...
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    I sent out the Gerber files on 12/13, the PCB...

    I sent out the Gerber files on 12/13, the PCB house has not started making it until today. If they don't start it, I will not have a delivery date. Everyday I asked them to start rolling the ball,...
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    My PCB layout is done. I hope that I can get an...

    My PCB layout is done. I hope that I can get an assembled board in two weeks. Someone is going to assemble it for me.

    26865

    The board is denser than my Mini_T32 board, it should take longer to...
  6. A LPF to stop the battery charge status LED flashing on the TinyPICO board

    My PCB layout which will shrink the TinyPICO is done and will be sent out tomorrow.

    During the design process I found that the orange LED on the TinyPICO board flashing when no battery is...
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    Thanks defragster for your suggestions. The...

    Thanks defragster for your suggestions.

    The JST battery connector can be added later, I am thinking about all options.
    The PSRAM will be on the top, I will try to use 0402 as many as possible, at...
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    Shrink the TinyPICO

    After several version changes, I placed all components on the size of my Mini-T3.2. Top layer only, including the PSRAM. The CH340G has no DTR signal, so I have to use the CP2104.
    For a good reason...
  9. @joepasquariello - Thanks for your kind words....

    @joepasquariello - Thanks for your kind words. Sorry for the late reply. I have been working on my TinyPICO very hard.

    The link on PCBway.com has been changed to the following:...
  10. I just uploaded all files necessary for making...

    I just uploaded all files necessary for making this project.

    The Gerber files can be downloaded from OSHpark

    https://oshpark.com/shared_projects/3lU6j4S5 The Mini T3.2 board
    ...
  11. Yes Sir, I will do it, it's an honor to have your...

    Yes Sir, I will do it, it's an honor to have your encouragement.
    I will post all assembly instructions online tonight and upload Gerber files to OSHpark. The cost is only about $3 including shipping...
  12. @shawn - I could not find your email address at...

    @shawn - I could not find your email address at github, could you please PM me your email address? I will send all files out to you. I just did it to @joepasquariello
    When I see more forum...
  13. @defragster - Thank you again for the kind words....

    @defragster - Thank you again for the kind words. The SWD interface pads on this prototype are used for my testing only. They were removed from the Geber files that I published.
    I would like to find...
  14. There is not much interest in this product, the...

    There is not much interest in this product, the cost of making this board with a bootloader chip may be more than $20 for 5-10 pieces. This may not be feasible for anyone to make it. I removed it...
  15. @pictographer and @defragster - Thanks for the...

    @pictographer and @defragster - Thanks for the nice words. I do hope some one who has a reflow oven to make some. It's not too difficult. All parts in the BOM are cheap and you can get them from...
  16. Thanks Paul! I understand what you said. I...

    Thanks Paul! I understand what you said. I thought that you could have changed the rules recently. Just wanted to double check it.
    Since the Mini 3.2 has your bootloader built-in, it's free for...
  17. Since nobody is interested in this project so far...

    Since nobody is interested in this project so far I temporarily stopped sharing on the PCBway's site. I would like to clarify somethings before restarting it.

    1. Paul Stoffregen made a reference...
  18. Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    Inspired by onehorse's project in the past I have designed a small module of Teensy 3.2 alike.
    You can download its Gerber files, schematic and BOM at the following link:
    << edit new link below...
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    You are right, the 0402 is more difficult than...

    You are right, the 0402 is more difficult than other sizes, only should be used when you don't have other sizes available.

    I buy microSD in a reel from a Chinese manufacturer that only sells to...
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    Sorry I was busy this weekend with something...

    Sorry I was busy this weekend with something else.

    @kurt - I bought microSDs in a reel from a manufacturer, one of our suppliers. I don't know where you can get it. I could not find it on eBay....
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    @MichaelMeissner - I added all pads I could on...

    @MichaelMeissner - I added all pads I could on both versions, with or without USB host.
    The new boards are available at Oshpark.

    https://oshpark.com/shared_projects/vzG532jm
    ...
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    @PaulStoffregen - Using FRDM4236 is OK, thanks. ...

    @PaulStoffregen - Using FRDM4236 is OK, thanks.

    @KurtE - Glad you had good results. Blackketter's USB board works on his breakout board and it should work on FRDM4236 board. I don't expect any...
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    The FRDM4236-V3 breakout board is available at...

    The FRDM4236-V3 breakout board is available at Oshpark. https://oshpark.com/shared_projects/8rSyUnt5
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    @MichaelMeissner - I think it's a good idea. I...

    @MichaelMeissner - I think it's a good idea. I will add all pads and make a V3A board. Thanks.
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    Test log files: ...

    Test log files: www.trainer4edu.com/edubase_teensy/frdm4236_test_log.zip
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    I tested it today. The results are as follows: ...

    I tested it today. The results are as follows:

    1. It works at 912 MHz OK, no heat sink is needed, no fan is needed to cool the T4.
    2. For 960 MHz, with a small USB fan to cool, it ran OK...
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    @defragster: From what you explained I am sure...

    @defragster: From what you explained I am sure that the T4 is overheated and burnt. The V3 and GND and a few other pins are all short together internally. The 3V regulator is in the thermal shutdown...
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    @defragster: Thanks for your testing, it's a lot...

    @defragster: Thanks for your testing, it's a lot of time spent. I am sorry for the problem. I will test here. When it's done and if nothing is wrong, I will send you one for your testing again. ...
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    @DaQue: I did not intentionally to break it into...

    @DaQue: I did not intentionally to break it into pieces. I started it with V1 to make a Teensy V3.6 compatible before seeing blackketter's USB host. I was going to stop there, but some forum members...
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    I have not used non-clean flux regularly for 20...

    I have not used non-clean flux regularly for 20 years, except a very few special cases like this to demo and on a board cannot be cleaned by water.
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    @DaQue: Sorry for confusing anyone. The one you...

    @DaQue: Sorry for confusing anyone. The one you should visit is http://www.trainer4edu.com/edubase_teensy/frdm_4236.html for assembling instructions. On the top of that page you can jump to...
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    @defragster: Thanks, as you suggested I extended...

    @defragster: Thanks, as you suggested I extended the PCB and picked up the D+ and D-. I added an external 5V pin for the VUSB of blackketter's board. The new PCB is available at Oshpark. See more...
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    Some members would like to use the FRDM4236...

    Some members would like to use the FRDM4236 breakout board to test USB host function. Since blackketter made a nice small USB card I will make the FRDM4236-V2. It will bring out a 6-pin female header...
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    All 3 are sold.

    All 3 are sold.
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    Thanks Palmerr for your Eagle lib...

    Thanks Palmerr for your Eagle lib
    ************************************************

    neurofun is right, any size ranging from 0402 to 0805.
    If you happen to have one size, but no other sizes, you...
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    Thanks blackketter, I did not think about the...

    Thanks blackketter,
    I did not think about the USB port. If a USB port needs to be made, I guess that it can be made by a small separate PCB with a female header to provide USB signals: 5V,...
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    Thanks DerekR, The 1.0mm pitch castellated holes...

    Thanks DerekR,
    The 1.0mm pitch castellated holes were all good for my a 0.8mm PCB made by Oshpark. In the future as long as they route out all cut off holes, their PCB will be usable. My board is...
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    Thanks Micheal.

    Thanks Micheal.
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    I made a third Teensy 4.0 breakout board with...

    I made a third Teensy 4.0 breakout board with Teensy 3.6 footprint. it worked as a 3.6.**
    You can order it at Oshpark, but make sure to ask them not to miss any castellated holes....
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