Відео

That's right. You can print over the top of things if you can "bridge" the strings of melted filament from one plastic support to another. This PCB was designed to do that by adding a lot of extra posts in the middle of the PCB to reduce the bridging distance. See this video ua-cam.com/video/MVzu-X4oacA/v-deo.html where we designed the PCB. It talks about making holes for the bridging posts. This idea won't work for all PCBs - you need to plan for it when you're building the PCB.

@ Thanks for clarification. I’ve seen previous video bub didn’t know that it is possible to print this way. How do you know minimum distance between stands? I mean - one can find out this distance by trial and errors or there is some filament parameter for this?

@@kimsanov There's 3d printing enthusiasts who spend all their hobby time just experimenting with this kind of stuff (not me...). The bridging distance possible depends on material, temperature, print head speed and how much sag and stringing you can tolerate. Search for 3d printing temperature tower for examples like this one that talk about it in depth. ua-cam.com/video/5mp2vCZ2iFc/v-deo.html&pp=ygUcYnJpZGdpbmcgM2QgcHJpbnQgdGVzdCB0b3dlcg%3D%3D For me, I typically assume I can bridge 10mm without a second thought. Beyond that, i start being more deliberate. You might want to watch a related video where we print around a 3d servo horn to make a gear using similar techniques: ua-cam.com/video/rQwg55PHdAc/v-deo.htmlsi=i2ot2JgSkuBxP4qT

@ Thank you for clarification! 👍👍👍

Thanks! I appreciate the feedback.

That's a good tip. I've also seen articles that say that a difference between well/poorly manufactured boards is extra solder paste in the heat conducting vias to increase transfer between the IC side and the heat sink side of the board.

It was interesting to look at the heat distribution on the L298N video. There was no thermal pad on that sink, but a camera showed that the IC and the sink were of equal temperature, so i think that's as good as it gets for the way that particular module was built.

Done. Thanks for the suggestion!

Exactly. As RDSon approaches zero, cost approaches infinity! At least until we figure out room-temperature supercondution.

Thanks! I just released the DRV8833 video without it, but in the rest of my videos I'll add notes that mention both F and C. UA-cam used to let you add little correction cards in line with the video after you uploaded the video but now they don't for some reason, so you're stuck with what you uploaded. I wish they still did for stuff like this.

DRV8874 looks like a good part. The DRV8874 doesn't seem to be available right now from low cost (Ali Express) vendors, only Pololu. The current sense feedback on that part is appealing, and something most other parts in that space don't have. I'll keep an eye on it and see if bargain modules pop up then do a follow up testing video. Can you tell me a bit more about your experience consigning parts with JLCPCB? I've looked at doing this, but so far have stuck with their default library, and hand added anything they didn't carry.

They charge an extra fee for non-standard parts, but they source them directly from their partner company LCSC via LCSC part numbers, so the extra fee really isn’t much. I was using KiCAD with a 3rd party JLC addon, so whether it was a basic part or not I had to manually find the matching part and add a column for its LCSC part number. I’m not sure what it’s like when using something else, like EasyEDA. As for getting parts not from LCSC, I wouldn’t know where to begin. I suspect JLC have carved out some section of the low-cost market from their ability to source from their partner company, while PCBway and others rely on the older method of “just email us to figure out which parts are coming from where”. I assume that’s still a fallback for JLC, but I’ve never tried to get a PCB with something not sold by JLC. I’ve also never tried their MCU programming procedure, or any of their 3DP or CNC options.

If the L298N is working in your application, there's no shame in keeping it there unless you think you'd benefit from the efficiency increase. Building one up from scratch sounds like fun in any case.

Are you using mosfets?

My pleasure. There's a lot I think could be better about P Touch, but they do a good job supporting virtually every printer they've made for 25 years.

Thanks for subscribing. Check out my embedded systems playlist for other general embedded systems topics, and feel free to make suggestions for things you'd like to see.

That's correct about the stretching. On Raspberry Pi 4 and earlier I used PiGPIO which can bit-bang i2c with : ua-cam.com/video/DDKcjpbYMH8/v-deo.html . It's a bit different than the FTDI chips. It's more like a smarter MCP3008 and PCA9685 combined. The Serial Wombat open source project is firmware that runs on PIC16 and PIC24 microcontrollers to turn the micros into I2C-to-Anything I/O expander chips that can do Analog to Digital Conversion, PWM, Servo, and lots more. They harness the power of the microcontroller to operate at a higher level than other I/O expanders and have really good Arduino/C#/Python libraries that run on the host. See SerialWombat.com for details. The smaller SW4B chip can only be controlled via I2C. The more capable SW18AB chip can be controlled via I2C or UART, so you can control it from your Raspberry Pi 1 through 5 via a USB to uart converter. See ua-cam.com/video/bE-h59y22WE/v-deo.html .

Glad it helped! Yeah, .CSV can be a variety of things depending on what end of line marker is used (mac vs windows) and if the text is ASCII or unicode. There's a few different ways to save. I've had to experiment.

Thanks! I tired hard to make the video series I wished existed when I started!

I can't find the sketch at the moment. From the video it looks like I didn't even rename it, so I think this may have been a throw-away demo effort. You can get the Wombat Panel shown in the video at: github.com/BroadwellConsultingInc/SerialWombatCsharpLib The Arduino library is available through the Arduino Library manager. The firmware for the Serial Wombat PIC24FJ256GA702 is available at: github.com/BroadwellConsultingInc/SerialWombat

1. Yes. You can power an SW4B chip with 3V to 5.5V. I2C lines can be 3V up to whatever you're supplying the SW4B chip with. 2. I'm not sure what you're asking with this question. If you want to modify the firmware (most people don't) then you'll need Microchip's MPLAB X development environment. If you want to use the SW4B firmware as is like any other I2C device, you can talk to it using available Arduino or Python libraries. 3. I haven't used EasyEDA. I use Eagle/Fusion for PCB design. I'd be grateful if you want to share any EasyEDA assets you create.

@@SerialWombat I am not sure I understand what do you mean by "assets". I create PCBs using EasyEDA for my projects because wires are not stable. I find EasyEDA comfortable because it is linked to LSCS for parts and JLCPCB for production. In order to use your chip, I would need a library schematic and layout, and a 3D model attached to create a 3D model of the PCB with the devices.

@@YigalBZ I'll look at what it would take to make this available.

Hello!

Thanks for the feedback. I'll mute the system sounds in editing going forward. I feel like I'm always looking for the "Goldilocks" Level of detail. On one hand, the video's already 30 minutes long (Average watch time has been about 4 minutes). But on the other hand, it also feels like I'm glossing over details. I wonder if it'd be better to do multi-part videos? More detail in a larger number of small packages?

@@SerialWombat Hopefully others will chime in with their opinion, but for me, your idea of multi-part videos would be the way to go.

WombatPanel. It works with my Serial Wombat firmware for the PIC24FJ256GA702. It's written in C#. There's a library of classes for all the things the Serial Wombat chip can do, and then the WombatPanel GUI is written on top of that. The GUI is based on Windows Forms, so it's Windows only. But the underlying libraries will run on anything that can run .Net core (such as raspberry pi). The interfaces match up on the libraries for C#, Arduino (C++) and (Micro)?Python. github.com/BroadwellConsultingInc/SerialWombatCsharpLib

To read IR, you need to get the active time of all the pulses. The Serial Wombat 4B chip can't store queued pulse lengths. It's limited RAM won't allow it. The best it can do is return the last high and low time from the pulse most recently received before the communication request comes in. This is typically better than using the PulseIn function on Arduino, but obviously has its limits. It's primarily designed with RC servo signal capture in mind. The Serial Wombat 18AB chip and firmware has a lot more guts inside, and has an internal buffer that is capable of being linked to a pin in pulse input mode in order to form a queue capable of storing pulse data. I've successfully used it to capture incoming data from an IR remote control. I don't have a video up on it yet, but I've proved it out. A new pin mode in the SW18AB will be queued pulse output, which will I've proven out to be able to output the same signal that was captured using queued input. If you used an digital logic chip to combine this and a PWM signal at 38KHz on another pin, you should be able to fully drive an IR LED to control a TV or whatever.

Glad you enjoyed it!

Good luck with the project! I'll look forward to seeing it.

That's definitely in "It Depends..." territory. We saw a 30 degree rise at 5A, so we would expect probably 3x to 4x that at 10A (Newton's law of cooling helps some). If it's in a contained box, less time. If it's at a higher ambient temperature, less time. If you only use a couple of the connectors nearest to the terminals, more time. If there's wires on all the pins, probably less time because they're now insulated rather than acting like heat sinks. If you go higher than 5A, I'd recommend using both slots in the terminals, as they're rated up to 10A. In the future I'll likely revise the design to use both top and bottom traces on the positive rail, and probably add some area to the positive between the terminals and the pins to increase heat dispersement.

I don't have one ready to go out of the box, the 16F15214 is the only Enhanced Mid Range part I've done one for. You could certainly start with this one and adapt it. All the concepts would be the same, the memory map, flash page/line sizes and peripheral interfaces may vary a bit from chip to chip. If you need help for a professional project, hit me up. I do embedded systems consulting.

Thank you for your reply! I´ve spent the last 3 days desperatly trying to put some bootloader to work on a 16F1824 or 1829 chip. I tried application note AN1310 from Microchip, and it didnt work (very frustrating). Now I´m so desperate that I´m considering put my PICs aside altogheter and try a STM32F030 that comes with a bootloader factory programmed. How much would you charge me to create a bootloader for a PIC16F1824? Thank you!@@SerialWombat