Attach the 4 M3 magnetic feet to the corner posts on the MagTag by screwing them in. Connect the 2-pin JST connector on the LiPo battery to the JST connector on the back of the MagTag.
Now the MagTag can be attached to a fridge, filing cabinet, or other magnetic surface. The battery allows the project to run even while a USB C cable is not connected.
Run the CPI Tracker
After copying the code.py and 50_cent.bmp files to the MagTag's CIRCUITPY drive the project will automatically start. If you see an error message be sure that you have configured your WiFi credentials inside of settings.toml as shown on this guide page.
Charge the LiPo occasionally by plugging in the MagTag via the USB C plug to either a power adapter or computer. If the battery has died you can tell by the small green "on" LED on the back of the MagTag being off.
Page last edited November 14, 2025
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