=====Dragonfruit Team Meeting - Week of February 5th, 2018===== Attended: Kyaw, Tyler ==== Updates 2/7 ==== * Finished Edits * Waiting on response from Kyle ==== Updates 2/7 ==== * Still working on board edits from Kyle * Finished edits on the main board * Next is to finish edits on the sensor board * Soldered a new sensor board * Dylan will try programming the board with the new sensor board next time he comes in * Changing the 1N4148 Diode from a SMD to a THRU ==== Updates 2/5 ==== * Suggested edits from Kyle review on Dragon Fruit PCB V4 * General: * reallocate bottom plane to use as various split power planes * a ground plane is not needed on both top and bottom. instead, you can use vias to connect grounds from the bottom as needed * change placement of all headers to be on the edge of the board (good practice) * this helps to avoid cutting into power and ground planes * don't route traces into component pads diagonally (try to hit the pad straight) * avoid sudden trace width reduction (xb_en,n46 signals) * instead, keep trace width consistent * Main Board: * reduce trace widths of miso, sck,mosi, and other data lines * 7 mils is usually enough for data signals * delete the bottom ground plane and replace with vload, +5v_mcu, and 3.3v_xb planes * place load header and voltage regulators closer to components * looking at your existing board layout, it seems like the top is the optimal place * don't need to route gnd trace for mcu because the entire top layer is ground * this is only needed if the plane is cut off entirely from the pin/component (known as an island) * avoid running traces near the board perimeter (xbee_tx, prog_rx, prog_tx signals) * avoid unnecessary use of planes (n46 signal) * due to the pin pitch of the voltage regulator, the plane is narrowed significantly * if the effective trace width of a plane is equivalent to that of a regular trace, it defeats the purpose of using a plane * rearrange components to maximize effective trace width from planes but also keeping planes compact * keep proper clearances from holes (C16 and U$4 are too close) * remove silkscreen from component values from board * keep the text less cluttered and you can also refer to your schematic for component values * Sensor Board: * avoid sudden trace width reduction (gnd to u$6) * avoid creating additional planes on the top layer * the +5V_SEN_S plane on the top severs the ground plane * +5V_SEN_S is already being used as the bottom plane so you can just use vias to connect components to that power plane * top plane should be reserved exclusively for gnd * remove gnd nubs (C27) * avoid using traces if planes can be utilized to connect signals * don't need to use traces to route gnd signal for gps * use vias instead ==== Future Tasks ==== * SCEL Meeting 2/3/18!!! * Generate Gerber files once green light is LIT from Kyle.