- Add the pulse sensor, load the headband's Arduino sketch onto the microcontroller, and test the sensor.
- Be sure not to pinch the connectors on the back of the sensor's circuit board, just touch the side with the heart.
- Dry fit the components onto a piece of perfboard.
- Fit the heart display over the components, and mark the component layout with a marker.
- Trim the circuit board to fit behind the heart display with a pair of shears.
- Double check the fit by pairing the board with the display.
- File the edges of the fiberglass perfboard to be smooth.
- Wear a dusk mask!
- Headband time! Measure around the circumference of your head, then cut two pieces of ribbon to that length.
- Thanks to Britex Fabrics for supplying the beautiful brocade and grosgrain ribbon for this project!
- Cut a piece of cord elastic about six inches long.
- Tie the ends together in a square knot to make a loop of elastic.
Line up the ribbons and use a zigzag stitch along the sides, but only sew together the ends of the ribbons, leaving the middle section open as shown.
- We'll connect the ends of the ribbon with the elastic to form the headband.
- Fold and pin the ribbon ends to enclose the raw edge, and sandwich one side of the elastic loop in the fold.
- Use this seam to hide the knot in the elastic.
- Stitch the ribbon seam around the elastic and repeat on the other side.
- Now the headband is stretchy where it needs to be, and firm everywhere else to support the (non-stretchy) circuit!
- Wire up the sensor and power board and lay the circuit out on the headband to decide where the display will go.
- When you find the spot you like, pierce the heart display's header pins through the outer ribbon of the headband and then through the perfboard. Solder it up.
- Run the sensor out a small opening near the back of the headband, so it can loop around and clip to the ear.
- Stitch down the wires so they stay put inside the headband.
- Use a zigzag stitch to sew the headband shut along the remaining open edges.
- You may have to hand-stitch some spots too tight to get at with the sewing machine.
- Leave an opening near the power board for toggling the power and changing the battery.
- I used snaps to make a recloseable opening so I can show off the circuit.
- Install the battery and turn it on.
- Attach the ear clip to the pulse sensor and try it on!
Congratulations, you're done!
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