Add build instructions
@@ -34,7 +34,30 @@ You will need the following components.
- 16x M3 nut ([EU](https://www.amazon.de/dp/B07JMF3KMD), [US](https://www.amazon.com/dp/B071NLDW56))
- 6x M3x5 screw ([EU](https://www.amazon.de/dp/B01HBRG3W8), [US](https://www.amazon.com/dp/B07MBHMLL2))
- Wires ([EU](https://www.amazon.de/dp/B07KYHBVR7), [US](https://www.amazon.com/dp/B07GD2BWPY))
+
(Optional)
- 1x Ultrasonic Sensor ([EU](https://www.amazon.de/dp/B00LSJWRXU), [US](https://www.amazon.com/dp/B0852V181G/))
- 1x On/Off Switch ([EU](https://www.amazon.de/dp/B07QB22J62), [US](https://www.amazon.com/dp/B01N2U8PK0))
- 2x Orange LED 5mm ([EU](https://www.amazon.de/gp/product/B01NCL0UTQ), [US](https://www.amazon.com/dp/B077XD7MVB))
+
+## Build instructions
+1) Connect wires to the motors if neccessary
+2) Insert the positive and negative leads of two motors into OUT1 (+) and OUT2 (-) of the L298N board
+3) Insert the positive and negative leads of the other two motors into OUT4 (+) and OUT3 (-) of the L298N board
+4) Mount the L298N with four M3x5 screws and the motors with eight M3x25 screws and nuts
+5) (Optional) Install the ultrasonic sensor and orange LEDs
+6) Mount the bottom of the phone mount to the top plate using two M3x25 screws and nuts
+7) Insert the top of the phone mount and install the spring or rubber band
+8) Mount the speed sensors with one M3x5 screw each
+9) Install the battery case (e.g. velcro)
+10) (Optional) Insert the on/off switch
+11) Connect the PWM inputs of the L298 to pins D5, D6, D9 and D10 of the Arduino
+12) Connect the speed sensors and ultrasonic sensor to 5V and GND
+13) Connect D0 of the speed sensors to pins D2 (left) and D2 (right) of the Arduino
+14) Connect Echo and Trigger of the ultrasonic sensor to pin D4 of the Arduino
+15) Connect the USB cable to the Arduino and route it through the top cover
+16) (Optional) Connect the LEDs to pins D7 (left) and D8 (right) of the Arduino and GND
+17) (Optional) Connect the voltage divider to pin A7 of the Arduino
+18) Connect the battery cables to Vin of L298N. If you installed the switch, put it in the current path.
+19) Insert six M3 nuts into the bottom plate and mount the top cover with six M3x25 screws
+20) Install the wheels
