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    A Teensy 3.2 compatible board with a RGB, LiPo battery charger, Qwiic and USB-C

    I finished a prototype and also added a WS2812 RGB LED. The prototype works as I expected. If anyone is interested in manufacturing it please contact me at firebirduino@gmail.com I will give you Gerber files and BOM with 100% open source.
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    A Teensy 3.2 compatible board with a RGB, LiPo battery charger, Qwiic and USB-C

    Since the Teensy 3.2 is discontinued I think that I may be able to make some Teensy 3.2 compatible boards to help anyone who needs it. My board will include a LiPo battery charger, Qwiic and USB-C connectors. The price is $25 each. The bootloader is $6.8 from PJRC, so the board is only $18.2...
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    40 MK20DX256VLH7 chips are available

    10 MK22FN512VLH12 boards and 40 MK20DX256VLH7 boards. Tester for MK20DX256VLH7 and bootloader before they are soldered. 40 MK20DX256VLH7 board are selling for $400. 40 re-furbished and fully tested MK20DX256VLH7 are $18 each.
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    40 MK20DX256VLH7 chips are available

    Sorry that I could not upload my pictures last night. I uploaded pictures to a forum member last night and was told that my file maybe too big or in a wrong format. He recommended to use a URL address for pictures. I will do it tonight. Just involved other things right now.
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    40 MK20DX256VLH7 chips are available

    I just found 40 mini Teensy with SWD debugger header made before my mini32. https://forum.pjrc.com/threads/68613-Mini-3-2-Made-Teensy-3-2-smaller-at-30-48mm-x-12-98mm They were assembled by PCBway 4-5 years ago. The chips are legit. I could not found them in stock until now. I need to...
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    Shrink the TinyPICO

    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 TinyPICO will stay in a loop to test it continuously, so it won't execute a user's sketch. I found it...
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    Shrink the TinyPICO

    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 uploaded the Blink-A-LED sketches OK, fast and just like the TinyPICO. I got the following message...
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    A LPF to stop the battery charge status LED flashing on TinyPICO board

    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 orange LED. The freq. is pretty low and required a large RC time constant to stop the...
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    Shrink the TinyPICO

    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, but nothing happened, my order was just sitting there. I changed the board color from black to...
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    Shrink the TinyPICO

    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. The board is denser than my Mini_T32 board, it should take longer to finish, but it was easier than I thought, maybe because I moved down from 6mil/6mil trace and 12mil/24mil...
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    A LPF to stop the battery charge status LED flashing on TinyPICO board

    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 connected. It's a bit...
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    Shrink the TinyPICO

    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 least all capacitors will be 0402. The whip Ant. is just a 1.17" hook up wire. A commercial whip...
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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 I extended the PCB 1.27mm longer, but the length of the PCB is still no longer than the TinyPICO...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    @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: https://www.pcbway.com/project/shareproject/Mini_T3_2___Miniaturization_of_Teensy_3_2_board.html. You can download...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    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 https://oshpark.com/shared_projects/kjFjK3cl The label sheet Assembly instructions are available at...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    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 at OSHpark.
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    @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 members request files, then I will post it online. @defragster - To put the TinyPICO in the mini32...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    @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 which part caused the problem if my board did not work. When a board was not working I would...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    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 from sharing. The link to PCBway in this thread is disabled, you will only see an error message...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    @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 LCSC.com. The MK20DX256VLH and bootloader may be gotten from PJRC.com as a set in a small qty...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    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 anyone to make and sell without restrictions. Anyone one uses the board and installs any...
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    Mini 3.2 - Made Teensy 3.2 smaller at 30.48mm x 12.98mm.

    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 board to help his customers with their hardware design. This mini 3.2 board with a PJRC's...
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    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 >> The link on PCBway.com has been changed to the following...
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    Is there a third Teensy 4.0 breakout board?

    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 their domestic market. They don't even speak English. Their part# is meaningless. 520A, what's the...
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    Is there a third Teensy 4.0 breakout board?

    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. If you don't solder 2 mounting pads in the back, you may solder the same one being used on Teensy...
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    Is there a third Teensy 4.0 breakout board?

    @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 https://oshpark.com/shared_projects/GFFDokGT, I made it smaller, so it's 50 cents cheaper.
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    Is there a third Teensy 4.0 breakout board?

    @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 problems, but you never know. @MichaelMeissner - I could not plate most of pins except G, D0-D4...
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    Is there a third Teensy 4.0 breakout board?

    The FRDM4236-V3 breakout board is available at Oshpark. https://oshpark.com/shared_projects/8rSyUnt5
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    Is there a third Teensy 4.0 breakout board?

    @MichaelMeissner - I think it's a good idea. I will add all pads and make a V3A board. Thanks.
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    Is there a third Teensy 4.0 breakout board?

    Test log files: www.trainer4edu.com/edubase_teensy/frdm4236_test_log.zip
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    Is there a third Teensy 4.0 breakout board?

    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 with or without a heat sink. Without a fan, it's frozen at 60 C even with a heat sink. 3. For 1GHz...
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    Is there a third Teensy 4.0 breakout board?

    @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 mode. The heat does not only dissipates through heat sink, it also dissipates through PCB. The...
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    Is there a third Teensy 4.0 breakout board?

    @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. I stopped sharing until defragster new testing is done and with a good result. For anyone who...
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    Is there a third Teensy 4.0 breakout board?

    @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 would like to have USB host feather available, so I thought about making a small add-on board...
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    Is there a third Teensy 4.0 breakout board?

    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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    Is there a third Teensy 4.0 breakout board?

    @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 Oshpark to get the V3 board. I don't remember if I ever posted the http://www.trainer4edu.com. This...
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    Is there a third Teensy 4.0 breakout board?

    @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 info. of the new PCB at http://www.trainer4edu.com/edubase_teensy/frdm_4236.html @DerekR...
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    Is there a third Teensy 4.0 breakout board?

    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 to be used with blackketter's USB card. So this is a good time to make some changes...
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    Is there a third Teensy 4.0 breakout board?

    All 3 are sold.
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    Is there a third Teensy 4.0 breakout board?

    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 still can make it. The value is not critical for decoupling, 20% tolerance is fine. The parts are all...
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    Is there a third Teensy 4.0 breakout board?

    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, D-,D+,G,G, like the one on the Teensy 3.5.
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    Is there a third Teensy 4.0 breakout board?

    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 unusable because they did not route out cut-out holes that I specified, not related to the 1.0mm...
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    Is there a third Teensy 4.0 breakout board?

    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. https://oshpark.com/shared_projects/CrfX6z5v** The details and assembling instructions are available at...
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