From d2d3a30d6f16b2a632b8057be1fbbd564730705b Mon Sep 17 00:00:00 2001 From: jacqueline Date: Thu, 9 May 2024 13:08:17 +1000 Subject: [PATCH] Add notes on part selection --- BOM.md | 52 +++++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 49 insertions(+), 3 deletions(-) diff --git a/BOM.md b/BOM.md index 0f0f5d5..0fbf7d2 100644 --- a/BOM.md +++ b/BOM.md @@ -9,16 +9,62 @@ This is a list of every part needed to assemble one Tangara. | Touchwheel cover (0.6mm FR4) | See `touchwheel-cover` | | 15 pos 0.5mm pitch FFC cable | Samtec FJH-15-R-03.00-4 | | 4x 6mm M2 standoffs | Wurth 970060244 | -| 4x 14mm countersunk M2 screws | | -| 4x 8mm countersunk M2 screws | | +| 4x 14mm countersunk M2 screws | Accu SHK-M2-14-V2-A2 | +| 4x 8mm countersunk M2 screws | Accu SHK-M2-8-V2-A4 | | Case top half | See `case-v2` | | Case bottom half | See `case-v2` | | Switch cover | See `case-v2` | | 2x Button covers | See `case-v2` | | SD card cover | TBD | | 3-pin 2200mAh 604560 LiPo | EcoCell LIP2-001 | +| Haptic motor | TBD | We're currently finalising our production v2 case design, including the SD card cover. Full sources for these will be available once they're finished. -For the battery, note that a 2-pin cell may be compatible if R1 on the mainboard PCB is populated with a 10k 0603 resitor. We recommend sourcing a suitable battery locally, as international shipping of LiPo batteries can be difficult. +Notes on selecting alternatives for specific parts are given below. + +## Display + +The display is considered a part of the faceplate, but there's enough options +for sourcing that it's worth a few notes here. + + - For production, we're using ER-TFT018-4 from EastRising Technology Co. + - [Adafruit's JFT-1800](https://www.adafruit.com/product/618) panel should also work fine. + - Most ST7735R / ST7735S displays available on AliExpress should work fine. + +## FFC Cable + +For all current mainboard and faceplate revisions, we use an FFC connector with +tin plated contacts. You should therefore try to pick an FFC cable that has tin +plated contacts, to avoid corrosion. + +Aside from the Samtec cable listed about, you might also consider: + + - Molex 98266-0836 + - GCT 05-15-D-0076-A-4-06-4-T + +## Screws + +Any 14mm and 8mm countersunk M2 screws will be fine. We've used Torx head for +our production units because we're big nerds, but you can often find hex and +Phillips head screws easily from local suppliers. + +## Battery + +For the battery, note that a 2-pin cell may be compatible if R1 on the +mainboard PCB is populated with a 10k 0603 resitor. We recommend sourcing a +suitable battery locally, as international shipping of LiPo batteries can be +difficult. + +## Haptics + +Tangara's haptic motor driver supports both LRA (closed and open-loop) and ERM +haptic motors, so sourcing a compatible motor is very easy. We'll update this +BOM once we've locked in our production motor, but some compatible choices are: + + - Vybronics Inc. VG0832022D (LRA) + - Vybronics Inc. VC1034B018F (ERM) + - Adafruit 1201 (ERM) + - DFRobot FIT0774 (ERM) +