Introduction: CalmCuff

The CalmCuff is a bracelet designed for discrete anxiety management. Powered by a Microbit, this device monitors a user's heart rate. If the devices measure a heartbeat over 55 BMP. A series of buzzes will begin reminding the user to breathe and ground themselves.

Grounding basically means to bring your focus to what is happening to you physically, either in your body or in your surroundings, instead of being trapped by the thoughts in your mind that are causing you to feel anxious. The small coin buzzer begins a 5-4-3-2 grounding sequence. This particular grounding sequence will prompt the user to observe five things they can see, four things they can touch, three things they can hear, and two things they can smell. This particular anxiety relief technique because of this versatility and discreteness; grounding is an action that can be practiced anywhere. The CalmCuff serves as a guide and a reminder to relax and breathe when life is hectic.



• BBC microbit

• Heartrate sensor

• Coin Buzzer

• Fabric (of your choice)

• Sewing material (needle, thread, glue, pins)

• Enclosure attachments

Step 1: Step 1: the Vibration Motor

Step one is getting the vibration motor to work, this is the code I used to make the Microbit vibrate. A vibration motor's moving parts are protected within the housing, and is perfect to indicate to the wearer when a status has changed. This motor has a 2-3.6V operating range, and it will these units shake crazily at 3V. The motor also has adhesive on the back for easy attachment to any material

Step 2: Step 2: Heart Rate Sensor

There are many options for heartrate rate sensors, i purchased mine from Amazon and it was 1/2 the price of the one listed on Sparkfun. For testing, I connected the pins to ground, 3V, and 2. Next, I implemented the code to see the display show my heartrate raising and lowering.

At this point, I also found my resting heart rate. I relaxed, found my pulse in my neck, set a timer for 15 seconds, and counted my pulse. I multiplied this number by 4 to find my BMP. I repeated this process 5 times and averaged out the values. I found my personal resting heart rate to be about 55 BPM.

The pulse sensor can be attached to your earlobe or fingertip, or any area with a pulse. This sensor plugs into your 3 *or *5 Volts

Step 3: Step 3 Integrate All the Components

Solder the buzzer and heart rate monitor. Solder the heartrate sensor to ground, 3V, and pin 2. Solder the vibration buzzer to ground and pin 1. Makse sure the connection is solid and no areas of the wire are missing a connection. Glue the buzzer to the Mircobit, and make sure no wire will be twisted out of place.

To write your heart rate monitor program, using the MakeCode editor and your algorithm. Remember to test regularly to ensure the desired result is being obtained.

In the picture, you can see how the heart rate sensor and vibration buzzer are to be attached to the microbiota.

Step 4: Step 4: Designing a Cuff

This is what will house the Microbit and the heartrate sensor. Cut out two pieces of fabric, roughly the width of the Microbit and the length long enough to fit around your wrist! Keep in mind extra space for where the fabric will be fastened together. Mark off a location to attach fasteners for the bracelet to snap together.

Keep in mind that any fabric or material can be used in this step. For a more dapper and formal look use a satin or silk material. For a casual look, use a cotton blend. I chose two fabrics for more versatility by the wearer!

Step 5: Step 5: Putting It Together

Glue a horizontal line inside the fabric so the Microbit does not wiggle around. Place the Microbit with its sensors in the pocket of the fabric. making not of where the heart rate sensor will lay. The heart rate sensor should end up on the inside of the wrist to get the best pulse reading.

Sew or glue a new pouch where the white lines are.

Step 6: Make Any Final Adjustments

Here is a demo of the final product!