Upgrade to SMD

Hi all,

So after a year+ using arduino building several projects I used only the ATmega328p-pu chip with 28p sockets on my circuits easy plug and unplug to program them with a arduino uno r3 but looks like all my circuits are big, time and space consuming to build.

I decided to upgrade to a smd chips my 1st thought was to buy as well the ATmega328 smd version but they are kinda expensive I would say (not much but a little), I'm as well inexperienced in smd soldering so I would like to try something cheaper and smaller (less pins) at the beginning to level up my experience with smd soldering.

Just for the record I will use a FTDI chip to program my smd chips.

So what would you suggest me to buy, what kind of smd chips/microcontrollers should I try(?), i would like some cheap ones to buy 10+ of them and build random projects.

Thanks, D.60

Here: http://www.ebay.ca/itm/5Pcs-IC-ATMEL-TQFP-32-ATMEGA328P-AU-MEGA328P-AU-ATMEGA328P-MEGA328P-/400819677442?hash=item5d52b6e902:g:ht4AAOSwD0lUgVrm

But why not use the dip version in a socket? http://www.ebay.ca/itm/10Pcs-ATMEGA328P-PU-Microcontrolle-r-With-ARDUINO-UNO-R3-Bootloader-good-quality-/201498941374?hash=item2eea45d7be:g:2TMAAOSwF1dUPOeZ

Or better still Arduino Pro Mini mounted on a mother/daughter card. http://www.ebay.ca/itm/10PCS-Pro-Mini-atmega328-5V-16M-Replace-ATmega128-Arduino-Compatible-with-Nano-/401090811852?hash=item5d62e017cc:g:oIEAAOSw7NNT-w-R

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Make sure you provide access to the SPI pins so you can bootload them. If not, a Programming Adapter like this is useful. http://www.hobbyking.com/hobbyking/store/__64417__Atmel_Atmega_Socket_Firmware_Flashing_Tool_AR_Warehouse_.html?strSearch=atmega |500x366 I find just putting a regular 2x3 male pins ICSP header and an FTDI header to be all I need, unless one is really pressed for space. Then accessing the pins via other means can be achieved, a '1284P DIP example: |500x365

Won't that vanilla ice cream damage the PCB. ;)

Trouble with that link. .

LarryD

Here:
http://www.ebay.ca/itm/5Pcs-IC-ATMEL-TQFP-32-ATMEGA328P-AU-MEGA328P-AU-ATMEGA328P-MEGA328P-/400819677442?hash=item5d52b6e902:g:ht4AAOSwD0lUgVrm

But why not use the dip version in a socket?
http://www.ebay.ca/itm/10Pcs-ATMEGA328P-PU-Microcontrolle-r-With-ARDUINO-UNO-R3-Bootloader-good-quality-/201498941374?hash=item2eea45d7be:g:2TMAAOSwF1dUPOeZ

Or better still Arduino Pro Mini mounted on a mother/daughter card.
http://www.ebay.ca/itm/10PCS-Pro-Mini-atmega328-5V-16M-Replace-ATmega128-Arduino-Compatible-with-Nano-/401090811852?hash=item5d62e017cc:g:oIEAAOSw7NNT-w-R

I want to skip the smd version of atmega328, “dip version in a socket” I already use them on my homemade circuits i want something smd :D, I don’t want to buy arduino pro mini, my goal is to build
homemade PCB learn how to solder smd and build as small as possible projects.

CrossRoads

If not, a Programming Adapter like this is useful.

That looks cool :smiley:

I thought that one time, but have progressed to soldering Pro Minis to my project boards, all in one solution!

;) You can bend the DIP leads 90 degrees to the body, hence SMD, haha.

5 pieces for $6.65 is a reasonable cost for the 328P AU SMD version.

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5 pieces for $6.65 is a reasonable cost for the 328P AU SMD version.

Well i found 10 pices for 10$ but i really don't want to try them yet, i need to buy as well 16Mhz smd crystals as well, smd resistors, smd buttons and i don't have all that yet :D

I was thinking to use some attiny smd version as practice 1st

Well i found 10 pices for 10$ but i really don’t want to try them yet, i need to buy as well 16Mhz smd crystals
as well, smd resistors, smd buttons and i don’t have all that yet :smiley:

Hum, all these are on the ‘Arduino Pro Mini’, now what about that, and only $2.00.

2016-06-09_16-49-15.jpg

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You can easily use many SMD components directly on a prototype board... Year ago I was soldering some 0603 and 0805 resistors and capacitors directly on the top of 2.54mm PCB Prototype Boards (those green ones with an matrix of holes). It works nice as the spacing between holes will match the component size.

You can also easily solder others components like SOT23-3 (Transistors and FETs) and SMD LEDs directly there. After that I also added some SOIC and SOP SMTs by using adapters like those:

|500x244

They also work fot SOT23-6 packages. Just have a good pair of fine tweezers, no-clean flux pen and some 0.5mm solder wire.

Currently I stay away from building a full prototype on breadboard/prototype board. I try only some isolated proof of concepts as it's very time consuming and sometimes the components, especially high frequency ones, "complains" about all the capacitance of breadboards and long leads.

Most of my work I do now on PCB software (DesignSpark/Eagle are good free ones). Just need to trust the datasheets and get the PCB professionally build. My job is just solder all components on the proper PADs. That allows me to use 0402 and also components without exposed PADs.

Unfortunately for hobbyists, the components are getting smaller every day and many are only available in tiny QFN package. Also getting Eval boards from manufacturers are not cheap. Another day I paid $35 for an Evaluation board of a Switching Regulator that costs $2.5 per chip + passives. Anyway still cheaper then spending 10 hours doing all by hand :)

I would caution against buying these ICs off ebay. There are plenty of fake chips. I buy them from mouser:

http://www.mouser.com/Search/Refine.aspx?Keyword=atmega328p

LarryD

Hum, all these are on the 'Arduino Pro Mini', now what about that, and only $2.00.

I can't understand :D you suggest me to buy Pro mini and unsolder the components or just use Pro mini? As i said above I'm building my OWN circuits PCB (Printed Circuit Boards) I don't need ready made circuits :D

musskopf

Nice boards, I use EAGLE as well because it's free and easy to use, I build my own PCB at home I already experimented and build successful over 9 PCB from small scale up to 10x10cm double side with transfer paper technique.

liudr

Mouser.com looks like a nice website but expensive as hell :D for one chip 3.4euro for 10x 2.5 that makes total 25euro just for 10, but from other website you can buy them 10x for10$ (from china)

Link in Reply #2 fixed.

Thanks for fixing the link :)

Btw looking closer i thought it got all pins but as i see only the necessary to bootload or upload code |500x366

that can be made (homemade) and using a FTDI usb chip to bootload/upload.

Take a square plastic, print on a paper a real scale 1:1 atmega328 chip and drill with 0.5mm drill the holes on the square plastic following as a guild the printed on paper chip, add some 0.5mm hard wire, add epoxy or hot glue to lock them in place and done :)

It is an adapter for a Programmer, so it connects to VCC-GND-Reset-SCK-MISO-MOSI. (Reset is held low during programming) Those are the pins needed for bootloading/setting fuses. Or for File:Upload Using Programmer. (or similar in 1.6.9) After that you can connect FTDI Basic or equivalent to VCC-GND-DTR-Rx-Tx for uploading/serial monitor debugging. (DTR connects to Reset thru a 0.1uF cap, and a 10K pullup resistor to 5V to make a Reset pulse and start the bootloader code).

Thanks for the info CR. I've been using pogo pins for the same purpose but that isn't ideal. Each board design needs its own programming jig in order to slide target board onto the pins or I have to hold the target board at an angle to see where the pins are and press it against the pins. I'll try this adapter. Any larger adapters for 1284?

liudr: I would caution against buying these ICs off ebay. There are plenty of fake chips. I buy them from mouser:

http://www.mouser.com/Search/Refine.aspx?Keyword=atmega328p

That's great if you live in the US, but Mouser charges an arm and a leg for shipping if you don't. I suggest that "plenty" is a large exaggeration of the number of fakes. I have been buying IC's from China for about 2 years, many different kinds, and I have never been burned. I prefer to buy from the large volume suppliers, they are less likely to get involved in hanky panky.

I too have purchased many things from China including individual components, never had problems.

Tools are another question, I would never buy: wire cutters, screw drivers, pliers, crimpers etc.

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So soon has everyone forgotten all about the fake FTDI chips. A batch of 20 nanos (before CH340 became standard of low cost USB/TTL) and a number of FTDI breakout boards I got from ebay all had fake chips. I simply stopped buying anything with FTDI chips except from Modern Devices. "Many" was not exaggeration when more than half of boards with "FTDI" I got were fakes. If you just want to have a learning experience, go right ahead with questionable parts. Just don't do it when your reputation is on the line.

looks more like everyone forgot about my topic:D