![]() Connect the ItsyBitsy to your computer and fire up the Arduino IDE.Pre-smoke test using the multimeter as mentioned above.Check for bridging or soldering errors around the microchip. Check that all soldering points looks shiny and appropriate. There is a nice article about reflow soldering using an electric skillet at SparkFun here. Make sure the parts are soldered on the entire board before powering it off and letting it cool down again. Keep watching to see when the solder melts and the magic happen. Carefully place the board in the electric skillet and crank the heat. I taped the paper to the table to avoid shuffling it around and accidentally mixing the parts. I lined them up on a piece of paper where I wrote down what components to put where. To make placing the parts easier I recommend sorting them beforehand and keeping track on what components to place where. The USB connector will be soldered to the back of the board with a regular soldering iron). (Except the buttons and the USB connector. This is the soldering process that worked well for me: Pliers to break the board out of the frame.Plastic putty knife to work the material out of the jar, get it lined up on the 6″ knife, and to help knead the paste before application.You really want to do the whole width in one pass, hence the 6″. 6″ Steel putty knife – we will use this as a squeegee to screen the solder paste on the board.To melt the solder paste and do the actual soldering. Electric skillet, to use as a reflow oven.The best is Lead-Free/RoHS, No Clean paste. We will use these to make a frame to align the board and stencil. Some other PCBs of the same thickness as the board you are assembling.It should be a bit larger than your stencil, and at a comfortable working height. A flat surface that you can tape PCBs down to.Isopropyl Alcohol, to clean the solder paste from the stencil and tools.Packing tape, to hold the stencil in place.The stencil to help with solder paste application.The bare PCB and the parts from the BOM file.Let us go over the materials/tools you will need: If we see very small resistance, there’s a chance there is a power-ground short on the board and plugging it in would let out the magic blue smoke that makes electronics work. You will repeat this test after assembly and before powering it up, but after assembly we expect to see something in the high K to low M-ohm resistance. You are hoping to see OL/Open Line (infinite resistance). ![]() Then touch the probes to the GND and VCC pads on the back of the board. Just take your multimeter, set it to resistance/Ohm mode, and touch the probes together to ensure you get a reading very close to 0 Ohms, to prove that the meter is working. Solderingįirst things first: make sure there is not a power-ground short on each PCB before assembling them. Now let us look into the soldering of the PCB. That should be it for the needed hardware components. It makes sense since that’s the board we are mimicking. The microchip comes with some default settings we need to change. I used SMD291AX50T3, and I think Jonathan prefers Kester Solder 70-4021-1410. There are small white dots on the PCB that indicates the orientation of the parts. You need to solder the Microchip and LEDs with the correct orientation. Take special notice to the Reference Designators column and be sure to solder the correct part to the correct place on the PCB. The BOM file is also included in the archive together with a. Jonathan created this handy CSV file which serves as a bill of materials showing all the parts to be soldered on the DHD PCB. I ordered all the SMD parts on except the LEDs which I ordered from. In addition to the bare PCB and stencil we also need a lot of resistors, an atmega32u4 microchip, the LEDs, and a few other parts. To apply the solder-paste to those pads we need a good stencil. The microchip also has a lot of very small solder pads. There are a lot of tiny, (very tiny!) SMD components that needs to be soldered to the PCB using a reflow method. Top side to the left and bottom side to the right.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |