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--- iothings:proiecte:2025sric:ledstrip [2025/05/29 00:22]
andrei.besliu [Code Snippets]
+++ iothings:proiecte:2025sric:ledstrip [2025/05/29 00:48] (current)
andrei.besliu [ESP32 Web-based LED strip]
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-====== ESP32 Web-based LED strip ======
+====== ESP32 BLE-based LED strip ======
   * Author: Besliu Andrei-Cornel
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   * Master: SCPD
   * Video Link: https://youtu.be/Q6bHqYo0OGY
-  * Source Code: TBD
+  * Source Code: {{:iothings:proiecte:2025sric:besliu_andrei_iot.zip}}
 ====== Introduction ======
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 ====== Hardware ======
-  * ESP32-WROOM-32: 1 x ESP32 Sparrow development board
+  * **ESP32-WROOM-32:** 1 x ESP32 Sparrow development board
-  * NeoPixel LED Strip: 1 x 5m NeoPixel LED strip, 300 LED's.
+  * **NeoPixel LED Strip:** 1 x 5m NeoPixel LED strip, 300 LED's.
-  * Breadboard: 1x Breadboard for securing connections.
+  * **Breadboard:** 1x Breadboard for securing connections.
-  * Connecting Cables
+  * **Connecting Cables**
-  * USB-A to micro USB cable
+  * **USB-A to micro USB cable**
 ====== Diagram ======
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 ====== Challenges ======
-====== References ======
+Not having proper soldering tools leads to bad electrical contacts and makes it a nightmare to debug any issues. Thankfully, jamming a wire through the ESP32 DevBoard pins worked brilliantly, just don't ask me to move it anywhere.
+Initially I wanted to use both BLE and a webpage hosted on the ESP32 itself to allow control of the LED strip from multiple sources but due to memory constraints on the ESP32 I had to choose only one (91% memory usage with the BLE implementation alone).
+I find it very annoying how BLE handles characteristics, only having a predefined set of BLEUUID's available to pick and choose from. For example, the was no readily available UUID for brightness or color, just a generic "LED Array" or "Led Strip".
+I choose BLE due to the easy implementaion as baking-in a HTML page in the Arduino IDE seems janky to me. The right way to approach would be by installing a lightweight RTOS such as NuttX or freeRTOS and ditching the BLE for a more customizable webpage, as in our case  battery and power constraints are irrelevant.
+====== References ======
+  * Adafruit_NeoPixel: https://github.com/adafruit/Adafruit_NeoPixel
+  * ArduinoBle: https://docs.arduino.cc/libraries/arduinoble/
+  * Our OCW labs.
+  * Some helpful StackOverflow threads.