Updated 1. Introduction (markdown)

1.-Introduction.md

@@ -38,7 +38,28 @@ If you're not sure how to print your own parts, **we sell them**! See [[Appendix
 ## Step 4: Get the necessary electronics components
 **TODO pix of all electrical components**
 
-**TODO electrical BOM here**
+- 1x **1734346-4** *(USB-B 2.0 Receptacle Connector 4 Position Surface Mount, Right Angle)*
+- 3x **ACML-0805-601-T** *(ferrite bead, 600 ohm, 0805 1LN)*
+- 1x **AP2202K-3.3** *(3.3V 150mA LDO regulator)*
+- 1x **AP2204K-1.8** *(1.8V 150mA LDO regulator)*
+- 1x **ATMEGA32U4RC-AU** *(Atmel microcontroller, 44TQFP)*
+- 1x **Atmel_ICSP** *(6-pin 0.100" ICSP header)*
+- 5x **D2LS-21** *(compact surface-mounting switch for long durability)*
+- 2x **IP4220CZ6,125** *(TVS diode, 5.5V, 6TSOP low capacitance, USB)*
+- 1x **LFXTAL055663BULK** *(8MHz ±20ppm crystal, 18pF, 150 Ohms, 4-SMD, no lead)*
+- 1x **SPMWH1228** *(3V, 0.5W white LED, 2.8mm x 3.5mm)*
+- 2x **PT26-51B/TR8** *(phototransistor, 940nm, right angle, 1206)*
+- 2x **XZTHI56W-1** *(infrared emitter, 880nm, 1.3V, 50mA)*
+- 1x **PMW3360DM-T2QU** *(optical gaming navigation sensor)*
+- 1x capacitor, 100pF, 100V, 0805, X5R or better
+- 7x capacitor, 0.1uF, 100V, 0805, X5R or better
+- 5x capacitor, 1uF, 25V, 0805, X5R or better
+- 5x capacitor, 10uF, 25V, 0805, X5R or better
+- 3x resistor, 0R, 0805
+- 4x resistor, 22R, 1%, 0805
+- 2x resistor, 100R, 1%, 0805
+- 8x resistor, 1k, 1%, 0805
+- 2x resistor, 10k, 1%, 0805
 
 Yup, you guessed it, **we sell complete components kits**. See [[Step 2 of Appendix A: Printed circuit boards|Appendix A: Printed circuit boards#step-2-order-the-electronics-components]] if you want more information (or info on how to buy them from your favourite electronics provider).