How to Build a DIY Heart and Activity Tracking Device

There are many heart and activity tracking devices on the market. Some DIY toolkits are efficient at helping you keep pace with your heart’s health. This will save you the stress of inviting a medical practitioner or frequenting your doctor’s office for such regular checkups.

Although you can easily find these DIY toolkits by using an online shopping directory, such devices can be pretty expensive. But the good news is that you can build your own heart and activity tracking device. All you need is to know where to get the right equipment. You can check out Wellue to see if they have what you need in that regard.

Meanwhile, below is a quick rundown of building a DIY heart and activity tracking device.

Materials needed to build your heart monitoring device

To build your heart and activity tracking device, you will need an ECG sensor, an LED, a power management module, an accelerometer, a battery, a 3-lead electrode cable, a Bluetooth module, and some electrodes. Among the materials listed above, the accelerometer and LED are optional.

Tools needed to build your heart monitoring device

The tools you will need for this project are mostly basic tools that you are familiar with. If you don’t have any, you can easily find them around. Some of the tools you will need include pliers, soldering iron and solder, wire cutter, header pins, wires, and tweezers. Optional items include a drill and glue gun. The wires you need are smaller ones; they are easier to handle for this project.

Methods in building your heart monitoring device

  1. Dismantle all the materials you have. Anyone proving tough should be handled with a plier.
  2. You have to be careful as some materials contain metal pins that protrude out. You can clip them off to make them handier and your work less tedious. Materials with such include the power module and the ECG.

Also, it is advisable to apply adhesive on the power block to separate the battery pins. This will prevent any short circuit possibility.

  1. After that, you can proceed to solder your wires to the pins. This way, one wire is connected to one pin and attached to the Bluetooth module. These pins are labeled DVCC (red), RX (yellow), STAT (white), and TX (blue).
  2. Proceed to trim the wires on the Bluetooth module. This will ensure the wire length is enough to cover the distance between the pins and those on the MCU. After getting the desired lengths, you can solder the wires. Thus, your Bluetooth module is well connected to your MCU.
  3. Prepare the items for the power block. This includes soldering header pins to DGND, A5, A6, AVCC, DVCC, AGND, O1, and VSS on the MCU.
  4. The ECG sensor will be connected to pin A1. Thus, the pin needs to be wired up. Other additions, such as the accelerometer, which tracks the activity, and LED, can now come in. Thus, pins A2, A3, A4, and O4 need to be wired up for this purpose.
  5. The power module can now be attached to the header pins. Use soldering to keep both components together.
  6. Since you have chosen to include the accelerometer and LED, solder three wires to DGND (black) and one wire to VSS (yellow).
  7. Proceed to solder the wires to matching pins on the accelerometer board. Thus, you will have the A4 wire connected to the Z pin, an AGND wire (black) to the AGND pin, an A2 wire to the X pin, and an AVCC wire (red) to the AVCC pin, and the A3 wire to the Y pin. Attach the sensor to the power module.
  8. Solder an AVCC wire (red) to the AVCC pin on the ECG sensor board. Other attachments include the VSS wire (yellow) to the VSS pin and an AGND wire (black) to the AGND pin. Also, connect the A3 pin on the ECG sensor board to the MCU’s A1 wire.
  1. Allow the ECG sensor board to settle on the Bluetooth module by flipping it. connect the LED to the MCU by soldering the O4 wire to the O3 pin and an AGND wire (black) to the AGND pin
  2. Use an adhesive to keep everything intact. A glue gun will do this perfectly. This will give you a compact device.

Other activities

Other activities needed to get your device working efficiently include connecting the electrodes and battery. You can use certain software tools or applications to capture visuals and record and replay data.


It is possible to build your own heart and activity tracking device. If you follow the steps above, you will create something you would be proud of.