![]() To that end, I decided to give the Shield and FreeCad “StepUp” plugin a full test. Using a Single-Layer PCB (for easy DIY users) and Packaging everything in a Small envelope has been a challenge (Photo example below - a larger box than preferred). Though I’m not a fan of Shield’s, interest in a Mega shield got me tinkering with making a Shield for an UNO… I no longer have a Webpage (too much user support needed for Newbie enthusiasts) but the 3D parts and some circuit configurations and code is still posted here (not updated). I posted several variations and many folks have built them. When the price of UNO’s and Nano’s dropped to peanuts, I converted the design again - trying out different configurations. ![]() Several yrs ago I migrated my dsPIC based Astronomy gizmo to Atmel Chips. All the download sketch button in the Arduino IDE does is call avrdude with the appropriate arguments. Some of them have to be programmed by an ICP dongle, or serial interface (USB to serial converter needed). Press a button to enter bootloader mode? After power on or a particular signal it goes into bootloader mode for an instant, and if nothing is found it runs the existing sketch.Ī lot of those breakout boards (there are far more than just Arduino) have ICP pins too when you want to bypass the bootloader. Sorry, most people using PCs for development have no desire to get another RS485 interface when USB ports are available and will also supply power.Ģ4V? A lot of people have even gone to 3.3V only these days. RS232 has a bit of tolerance and it’s perfectly possible to get within the correct band rate even if the crystal isn’t 11.059200 MHz or whatever. KiCad’s Footprint editor is quite good and easy to use. My guess is that you have little experience with making your own footprints and are apprehensive for diving into it and just doing it.īut there is no reason to be afraid of it. I have a suspicion that the root cause for this post is similar. If you “grow up” with “arduino” it’s comfortable and easy to stay within it’s limitations and find excuses for remaining there. I was programming uC’s long before “arduino” existed and was used to put a programming connector in each design I made, just as a voltage regulator that fit, and the right crystal for the job. ![]() I think half (maybe more?) depends on habits. So to me looks like we’re running in circles, and you’ll have to do the remaining 5% yourself. You can put the “arduino” board on the bottom, but it’s just as easy to flip the template mentioned earlier before export, and then put it on the top. Similar to BlackCoffe’s last post, I already suggested to swap connectors if needed, flip the board, extract Step or WRL from a KiCad template. With more modern microcontollers you also get real debug interfacesīut we’re getting sidetracked here. With a “real” programmer, you can be sure that the chip gets programmed from the right command in your makefile, or from your IDE, with no need to take your hands off the keyboard or mouse. ![]() Programming connectors just need a few wires, nothing more, and they always work.Pressing a button to enter boot loader mode? (But there are cases when bootloaders can be useful) I prefer to use onboard SMPS with a 24Vdc input. I don’t like the 16MHz crystal, it is not possible to get a real RS232 baudrate with it, which results in baudrates which are barely within tolerances.Pretty simple/basic… If you want a graphic, set your Mega to Bottom and adjust Z dist…Įvery argument has a valid counter argument. But, you get the idea…Īdd PinHeaders to board’s bottom and plug in your Mega. I was lazy and didn’t bother with the mating pinheaders or setting the correct distance for them. Image below shows an UNO shape with No header. I think you want to be able to plug the Mega into Pins mounted on the Bottom of main board. Mostly, though I use socketHeaders,I hated removing chips for re-programming (especially if needing to change only one thing) and some of my codes utilize Serial input for setting user’s values, such as local Latitude into Memory). No need for Power Regulator (user can tap off 13vdc for supply) or Pwr connector, caps….No need for XTAL unless wanting higher speed.I pay $4 for Nano’sįor me, the main advantages of using a complete board (Nano,UNO,Mega) are On Board: I stopped bothering with the chips when the price of Nano’s, UNO’s, Mega’s dropped to the price of a cup of coffee (I have boxes full if someone wants to buy chips, real cheap… LOL). I ‘think’ I get what you want to do… but, first…įYI - I’ve made quite a few projects with Atmel and PIC chips (from Atmega 328p, Tiny’s, PIC’s and dsPIC’s).
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