Hardware Components

* [http://www.gearbest.com/development-boards/pp_157850.html 2WD Chassis] [http://www.gearbest.com/development-boards/pp_157850.html $9.59 from GearBest]
* [https://www.amazon.com/gp/product/B00IOCCDBK 2x EBL 18650 Lithium-Ion batteries] [https://www.amazon.com/gp/product/B00IOCCDBK $5.67 from Amazon]
* [https://www.amazon.com/gp/product/B010SS22YA 2x 18650 battery holder] [https://www.amazon.com/gp/product/B010SS22YA $1.13 from Amazon]
* [http://www.gearbest.com/other-accessories/pp_226466.html L298N dual motor controller] [http://www.gearbest.com/other-accessories/pp_226466.html $1.56 from GearBest]
* [http://www.ebay.com/itm/301968348197 2x HC-020K Speed sensor module] [http://www.ebay.com/itm/301968348197 $6 from eBay]
* [http://www.gearbest.com/development-boards/pp_58067.html HC-SR04 ultrasonic rangefinder module] [http://www.gearbest.com/development-boards/pp_58067.html $1.50 from GearBest] [http://www.banggood.com/10Pcs-HC-SR04-Ultrasonic-Ranging-Sensor-Ultrasonic-Module-For-Arduino-p-942912.html $1.16 from Banggood]
* [https://abra-electronics.com/robotics-embedded-electronics/breakout-boards/level-shifters-and-expanders/bb-txb0108-8-channel-bi-directional-logic-level-converter-txb0108.html TXB0108 8-channel voltage level converter] [https://www.adafruit.com/product/395 from Adafruit]
* [https://www.adafruit.com/products/2885 Raspberry Pi Zero] [https://www.adafruit.com/products/2885 $5 from Adafruit]
* [https://www.adafruit.com/products/2822 2x20 Male Header Strip] [https://www.adafruit.com/products/2822 $0.95 from Adafruit]
* [https://www.adafruit.com/products/3157 Raspberry Pi Zero Camera Cable] [https://www.adafruit.com/products/3157 $5.95 from Adafruit]
* Jumper wires: female-to-female
* jumper wires: male-to-male

- Drill bits: 7/64, 9/64