2 weeks Ago By Kristina Panos
For this contest, we’re asking you to come up with the best SAO you can think of that does something cool. What could be cooler than It’s way better than just some sticker, and with the extra solder pad on the back, you can turn it into a pin once the con is over. Contact data can be uploaded over I2C.
Here, [Phil Weasel] seeks to answer the question of whether one can make a working NFC tag with the M24LR04E IC, using a PCB trace as a coil. If there is an issue, it’s probably going to be that copper plane inside the antenna. Designing the antenna itself proved fairly easy after checking the datasheet for the internal tuning capacitance (~27.
5 pF), verifying the frequency of NFC (~13.56 MHz), and doing the math to find the inductance needed. After confirming everything in LTSpice, [Phil] used and let the KiCad coil generator draw it out.
Did we mention the Jolly Wrencher is backlit by four side-mounted LEDs? Because what’s an SAO without a few blinkenlights?.
