Complete soldering.md

doc/README.md

@@ -1,12 +1,15 @@
 # Plaid // Through hole docs
 
-## Kit assembly
-- [BOM(parts list)](BOM.md)
-- Assembly
-- Bootloader & Firmware
+![plaid pcb](./img/plaid_pcb_top.jpg)
 
-## Assembly ALPHA ver
-- Build guide for alpha
-  - [build_guide_rev_alpha_en.md](./alpha/build_guide_rev_alpha_en.md)
-  - [build_guide_rev_alpha_jp.md](./alpha/build_guide_rev_alpha_jp.md)
+## Assembly
+1. [Check BOM(parts list)](BOM.md)
+2. [Solder components, excluding switches](soldering.md)
+3. [Bootloader](bootloader.md)
+4. [Firmware](firmware.md)
+5. Solder switches and assembly
+
+## ALPHA PCB
+- [build_guide_rev_alpha_en.md](./alpha/build_guide_rev_alpha_en.md)
+- [build_guide_rev_alpha_jp.md](./alpha/build_guide_rev_alpha_jp.md)
   

doc/soldering.md

@@ -0,0 +1,93 @@
+# Assembly
+
+## Before starting assembly
+- Check the components are complete. See [BOM](assembly.md). 
+- If you are not used to soldering, learn how to solder components.
+  - https://learn.adafruit.com/adafruit-guide-excellent-soldering/tools
+
+## Soldering
+### Zener diodes (D49,50)
+![zener diode](./img/assembly/1.JPG)
+Solder D49 and D50.   
+Diode is a `polarized` component and therefore take care of direction.
+A Black line on diode is cathode. (square pad on pcb)
+
+### Resistors (R1,2,3,4,7,8)
+![resistor](./img/assembly/2.JPG)
+
+Solder resistors.
+Don't place on R5 and R6. (They are for i2c)
+
+| Ref    | Value | Color code              |
+|--------|-------|-------------------------|
+| R1,7,8 | 1.5k  | Brown/Green/Red/Gold    |
+| R2,3   | 75    | Purple/Green/Black/Gold |
+| R4     | 10k   | Brown/Black/Orange/Gold |
+| R5,6   | I2C   | Do not place            |
+
+### Diodes 1N4148 (D1-48)
+![1N4148](./img/assembly/3.JPG)
+
+Solder D1-D48.
+Diode is a `polarized` component and therefore take care of direction.
+A Black line on diode is cathode. (square pad on pcb)
+
+### Crystal
+![crystal](./img/assembly/4.JPG)
+
+Solder crystal.
+
+### Capacitors (C1,2,4,5)
+![MLCC](./img/assembly/5.JPG)
+
+There are 2 kinds of lead pitch.
+
+| Ref  | Value | Lead pitch |
+|------|-------|------------|
+| C1,2 | 22pF  | 2.5mm      |
+| C4,5 | 0.1uF | 5mm        |
+
+### USB connector
+![USB](./img/assembly/6.JPG)
+
+Narrow pitch! Be careful of solder bridge between pins. 
+
+### LEDs
+![LED](./img/assembly/7.JPG)
+
+LED is a `polarized` component and therefore take care of direction.
+A short leg is cathode. (square pad on pcb)
+
+If you use leds, make bridge J4 and J5 on bottom side.
+![LED jumper](./img/assembly/8.JPG)
+
+### IC socket
+![ic socket](./img/assembly/9.JPG)
+
+Solder IC socket.
+IC socket is a `polarized` component and therefore take care of direction.
+Check the notch on silk and IC Socket.  
+
+### Electrolytic capacitor(C3) and Resettable fuse(F1)
+![Electrolytic capacitor and resettable fuse](./img/assembly/10.JPG)
+
+Electrolytic capacitor is a `polarized` component and therefore take care of direction.
+A short leg is cathode. (square pad on pcb)
+
+And after soldering resettable fuse, bend like the image. 
+
+### Tactile Switch(SW50,51) and pin header
+![SW and pin header](./img/assembly/11.JPG)
+
+### ATMEGA328p
+![ATMEGA328p](./img/assembly/12.JPG)
+
+Insert ATMEGA328P into IC Socket.
+
+ATMEGA328 is a `polarized` component and therefore take care of direction.
+See the image.
+
+## Check list before connect USB
+- No short between VCC and GND, USB connector pins.
+- Direction of polarized components.(ATMEGA328p, diode, resettable fuse, electrolytic capacitor)
+- Resistor value