THIS ESP32 PICO wristwatch has plenty of prospective

very first hand-built prototype. Nurse! isopropyl alcohol, stat!
Prolific hacker [Sulfuroid] is a medical physician by day, as well as an electronics hobbyist by night, as well as quite exactly how he finds the time, we have no idea.

The job we want to highlight is an ESP32 based LED smart watch, which we’ll sure you’ll agree, looks quite nicely developed so far, as well as [Sulfuroid] has bigger plans, as you may find, when you dig into the GitHub repo. This analog-style style uses four groups of 0603-sized LEDs, set up circularly to suggest the passage of time, or anything else you fancy. considering that there are four control buttons, a pancake vibration motor, as well as Wi-Fi as well as Bluetooth, the possibilities are endless.

In buy to stand a hope of driving those 192 LEDs from a single ESP32-Pico-D4, it was required to use a multiplexed LED driver, courtesy of the Lumissil IS31FL3733 device, which can deal with arrays up to 12 x 16 devices. This chip is one to remember, considering that it has some really good features, such as worldwide present control to minimize CPU overhead, automatic breathing loops for those fancy fade effects, as well as even includes a helpful open/short detection function, so it can report back assembly problems, assisting in reworking your dodgy soldering!

Routing circular arrays is such a pain.
Power as well as interfacing are taken care of by means of USB-C, with a TP4054 single Li-Ion cell charger chip managing the battery. This is a Taiwanese clone of the prominent LTC4054, however that chip may be a bit difficult to get at the moment. There is the common-as-muck CP2104 USB chip taking care of the emulated serial port side of things, considering that for some reason, the ESP32 still does not support USB. The Pico-D4 does have RTC support, however [Sulfuroid] made a decision to use a DS3231M RTC chip instead. We observed the touch functionality wasn’t damaged out – that might be added quickly in the next revision!

We’ve covered watches a lot, since who doesn’t want customized geek-wear! Here’s a slick one, a fun one with the brains on display, as well as lastly one using charlieplexing to get the element count down.