Hello World: Reflow

Before starting this section, make sure you have completed Hello World: Print and Hello World: Solder Paste, and have assembled and primed the solder paste dispenser.


Now that you have deposited solder paste on your circuit, all that is left to do is to place your components and reflow solder the board.

The Hello World circuit is a basic LED circuit. Holding a 9V battery to the  and  terminals on the circuit provides power, and a 555 timer IC chip sends the signal to flash the LEDs at a frequency determined by the resistor and capacitor values.

We have provided the schematic and layout below. If you use EAGLE, you can also download the source files here.


To assemble the circuit:

  • Remove the components from the tape by peeling back the clear plastic.
  • Carefully place your components onto the corresponding pads, as shown in the circuit layout.

 Do not smear the solder paste when placing components. Once they are placed, press down gently so the components rest evenly on the pads.

The components included in the Hello World Circuit Kit are Surface Mount Devices (SMD). Just like through-hole components, there are conventions for reading the values and orientations of SMD components:

Resistors: The value of an SMD resistor is written directly on the package. The last digit is the multiplier, while the digits in front of it give the value

Smd Res 180

LEDs: Unlike resistors, LEDs have a polarity! One side of the LEDs will be marked green, indicating the negative terminal. The image below shows how the LEDs should be arranged, according to the circuit layout:

Hello World Led

ICs (integrated circuits): These packages must be placed in the correct orientation so that the pins line up with the right pads. There is a dot on the package (and in the layout) that indicates PIN #1, as shown below:

Hello World Ic



Now that everything is set up, the circuit is ready to be reflow soldered.

  1. From the start menu, select the REFLOW option.
  2. Select Use recommended reflow profile
  3. Click REFLOW to start the process.

 The V-One gets hot while reflowing. Do not touch! Do not leave unattended while reflow soldering!

Once the V-One stops glowing red, the soldered PCB is safe to remove.


Your very first V-One printed and reflowed PCB is done! Unpack the 9V battery, and press the battery leads to the labelled pads to see your circuit say hello!

This concludes the Hello World tutorial. For answers to common questions and debugging tips, see the Troubleshooting section. Visit the User Guides section for important information on getting the most out of your V-One.

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