![]() ![]() If you'd like to do the same, in addition to A1, wire up A2, A3, A4, and also add two wires to O4, one of which you should solder to I1 (refer to the Final Result section for additional details). For this build, I've chosen to make the device a little bit more complete, and added the optional accelerometer (for activity tracking) and an LED (for event signalling). Step 6: Wire up at least pin A1 (to which the ECG sensor will be connected). Result: After this step you should end up with a nice base for the power block to be slotted onto note that I've also taken the chance to solder the holder pin on the Bluetooth module to I1 to strengthen the whole set. Tip: To get the thinnest form factor, generally I slide the pins from the bottom of the board up and trim the pins once soldered. Step 5: Now its time to prepare things for the power block… solder header pins to DVCC, A6, DGND, AVCC, VSS, AGND, A5, and O1 on the MCU. Result: After this step you should have the Bluetooth nicely matched to the MCU. ![]() Then you'll just need to heat it and slide the wire into the molten solder. Step 4: Trim the wires on the Bluetooth module to the length needed for each pin to reach its counterpart on the MCU and then solder each wire a handy procedure may be to apply solder to each of the pins on the MCU. Tip: When using a small gage wire (as in this case), the heat of the soldering iron can be a great way to strip the wires. Step 3: Solder one wire up to each of the pins labeled TX (blue), RX (yellow), DVCC (red), STAT (white), and DGND (black) to the Bluetooth module. Result: From Steps 1 & 2 you should have ended up with this set of parts: Tip: On the power block, applying glue or an adhesive that can isolate the battery pins to prevent short circuits is a good idea. Step 2: Some of the parts (the ECG and the power module) have metal pins sticking out, which you'll want to clip off in order to achieve the smallest form factor. Most come out straight away if you jiggle them up and down a couple of times, but for the MCU, you'll want to be more careful and use pliers to help out along the way. Step 1: Start by breaking off all the components. A glue gun and drill also will come in handy. Tools: Most of these you either already have, or you can easily find in any general electronics shop (e.g., SparkFun), but you'll definitely need wires (the smaller, the better), tweezers, pliers (regular and wire cutters), header pins, and solder and a soldering iron. Materials: This build started off with a HeartBIT kit, namely an Electrocardiography (ECG) sensor, an accelerometer (optional), an LED (optional), an MCU, a power management module, a Bluetooth module, a 3-lead electrode cable, a few electrodes, and a battery. Much better.Īlong the way, I've managed to gather a basic set of tools that may help my doctor see how my heart is doing. Now, considering what a typical IBI scatter looks like, all appears to be well, because the point cloud has a pretty normal spread (Figure 3, right).įigure 3: Pointcaré plot with the Inter-Beat Intervals (IBI) when I started to notice arrhythmias (left) and at the time of writing (right). The data shows that before, the arrhythmias were clearly noticeable, as highlighted by the red point clusters (Figure 3, left). Figure 3 shows the Inter-Beat Intervals (IBI) of a recording made when the symptoms appeared (left), and of a recording now (right). What have I learned? As it seems, my arrhythmias disappeared, which means they might have been stress-induced. I've taken most of the parts seen in Figure 1, turned them into the CubiKG device shown in Figure 2, use OpenSignals for data recording or the BITadroid app by David Marquez (when on the go), and then look at the data using the Heart Rate Variability (HRV) add-on for OpenSignals.įigure 2: CubiKG device wearable that resulted from this build it measures Electrocardiography (EKG) and motion data. Also, to fit everyone's attention span, I provided the highlights, and a more detailed how-to that walks through each step to guide you through the building process.įigure 1: BITalino ECG placement in an equivalent to what is known as the Einthoven triangle. Although I could keep slapping a bunch of cables and a PCB on me every day (Figure 1), miniaturized physiological computing devices are pretty fun to build and play with-at least for me-so I decided to make myself something more practical.Īs this project may be of interest for others, I wrote this tutorial explaining the making of CubiKG, a Holter monitor-like device for heart and activity tracking. Welcome to the communityĪ few weeks ago, my doctor told me to keep an eye on my heart with the help of DIY toolkit BITalino, and I wrote about it in Why my doctor prescribed me open hardware. ![]()
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