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  • post_sensor.php

  • Note: The code is intended to be instructional, and the examples provided will be commented on in as much detail as possible. Your feedback is welcome. Lean-C IOT remains an evolving software solution with much room for improvement!
  • update_sensor.php

  • Note: This page is used when the counter value remains unchanged for more than 2 occurrences (2 cosecutives HTTP posts with the same values of counter).In this situation, the ESP32 program - instead of creating a new line in the database - updates the...
  • Powering up!

  • After the writing process is complete, safely eject the SD card from your computerInsert the flashed SD card into your Raspberry Pi.Connect your Raspberry Pi to a power source. If this is the first boot, it will take a bit longer as the system expands...
  • 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  • Initially, we had the idea of reviving an outdated CASIO vintage watch frame that I had with the XIAO expansion board.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...
  • CODE

  • Here's the code used in this project.#include PCF8563 pcf; #include #include #include #include #define OLED_WIDTH 128 #define OLED_HEIGHT 64 #define OLED_ADDR 0x3C Adafruit_SSD1306 display(OLED_WIDTH, OLED_HEIGHT); void setup() { display.begin(SSD1306_SWITCHCAPVCC,...