RAMPS 1.4 3D Printer: Bluetooth Setup 1, Voltage Divider and Wiring

The RAMPS 1.4 3D printer controller is capable of using a Bluetooth module to connect to the host. However, the most common Bluetooth adapters use 3.3v logic. Since the RAMPS uses 5v logic, a voltage divider is required to protect the Bluetooth adapter from damage. Luckily this only costs around $1 and takes a few minutes to make. This short video shows construction and wiring of the voltage divider used to safely connect the RAMPS 1.4 3D printer module to an HC-05/HC-06 bluetooth module in order to enable wireless connectivity. The voltage divider goes between the TX of the RAMPS board and the RX of the HC-05 bluetooth module. Schematics and details of this set-up can be found in the Bluetooth section of the Reprap wiki here- http://reprap.org/wiki/RAMPS_1.4 Parts Needed- 1- HC-05 (or HC-06) bluetooth module 4- 10" female-female breadboard jumper wires (AKA DuPont cables) 2- 1" pieces of 1/8" heat shrink. 1- 1" piece of 1/4" heat shrink 1- 1k Ohm 1/8 watt resistor 1- 680 Ohm 1/8 watt resistor solder and soldering iron Note - This video covers the physical wiring & connection only. In the next video (here -    • RAMPS 1.4 3D Printer: Bluetooth Setup 2, C...  ) I go through how to configure the Bluetooth controller and the RAMPS so that the baud match and test connectivity from the host PC.