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  • XIAO Expansion Board with XIAO ESP32C3

  • An XIAO ESP32C3 microcontroller and an XIAO extension board manufactured by Seeed Studio comprised the heart of this project. It comes with rich peripherals that include an OLED, RTC, SD Card Sot, passive buzzer, reset/user button, 5V servo connector,...
  • Design

  • Initially, we had the idea of reviving an outdated CASIO vintage watch frame that I had with the XIAO expansion board. The expansion board contains the display, microcontroller, RTC and even the battery, so we prepared a rectangular holder that will...
  • Assembly Process

  • The holder part is added from the bottom side of the frame after the top part has been assembled onto the watch frame. Two M2 screws are used to secure everything in place
  • Assembly Process: Final

  • Next, we connected the JST connector of the expansion board to the JST connector of the LiPo cell.Next, we insert the battery into the top part and secure the expansion board in its proper position.Next, by using four m2 screws, we secure the expansion...
  • RESULT

  • Here's the end result of this super-small build: a digital wrist watch. The XIAO expansion board serves as a functional clock module in this useful and functional watch. The inbuilt buzzer can be used as an alarm indicator should we introduce an...
  • Part 1 - The PCB

  • What’s up my friends, welcome back. This below is the PCB that I’ve designed for my project. I’ve tried to make it as small as I could so it could fit inside of a basic wall electric box. This project works at 220V so make sure you stay safe and...
  • Part 3 - PCB Schemati

  • The schematic is quite easy. The basic configuration of the ESP32 chip with pullups to 3.3V for Enable and RST pins. The converter module give us 12V so we connect that in series with the AMS1117 regulators of 5 and 3.3V. The Relay circuit is simple....