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--- project:maerklin:system_control:start [2025/08/23 22:39] – [Hardware] Peter Siegmund
+++ project:maerklin:system_control:start [2025/09/14 20:40] (current) – [Hardware] Peter Siegmund
@@ Line 12: / Line 12: @@
 This system is built to be highly extensible. For this purpose, I designed a wireless system for indoor use based on Bluetooth LE. This decision was primarily driven by two factors: firstly, my desire to gain experience with BLE in a new project, and secondly (and more importantly), the aim to ensure independence from any specific MCU.
-Currently, I'm using an ESP32, which supports both Wi-Fi and BLE. However, I also plan to test other microcontrollers, such as those from the STM32 family (for instance, the [[https://www.st.com/en/microcontrollers-microprocessors/stm32wb-series.html|STM32WB-Series]], which offers strong BLE capabilities), to maintain this flexibility.
+Currently, I'm using an [[hardware:esp32:start|ESP32]], which supports both Wi-Fi and BLE. However, I also plan to test other microcontrollers, such as those from the [[hardware:stm32:start|STM32]] family (for instance, the [[https://www.st.com/en/microcontrollers-microprocessors/stm32wb-series.html|STM32WB-Series]], which offers strong BLE capabilities), to maintain this flexibility.
 ===== Technical Details =====
-Each client advertises a specific service. The System Control scans all nearby BLE devices and filters for this service UUID. This service includes a 'capabilities' characteristic, which transmits the client's capabilities once the System Control enables notifications for this characteristic. This allows the System Control to build its UI dynamically, according to the received data.
+In order to fully utilize the capabilities of the [[https://en.wikipedia.org/wiki/Bluetooth_Low_Energy|Bluetooth Low Energy]] standard, I have moved away from my original approach, which involved a custom configuration format transmitted via [[https://en.wikipedia.org/wiki/JSON|JSON]]. I will now adhere to the official BLE protocol, structuring the data using its defined services, characteristics, and descriptors and using minimal custom data.
-More in-depth information will be provided once the MVP is complete.
+The main MCU is a [[hardware:esp32:s3:start|]], in particular a [[https://www.wemos.cc/en/latest/s3/s3_mini.html|Lolin S3 Mini]]. It is capable of WiFi and BLE and has a small footprint. I'm planning to create a new revision with a [[hardware:esp32:c6:start|]] in the future, so I could use Zigbee, if needed. At first I thought, I need the full power of the ESP32-S3, but now I'm not sure, that I even need a dual core.
+The complete definition of the BLE protocol adapted to my system can be found in the [[.:ble:start|]] section.
 ===== Clients =====
@@ Line 37: / Line 39: @@
 ==== Hardware ====
-The hardware part was created within KiCad and it will be also in the git repository.
+The hardware part was created within [[software:kicad:start|]] and it will be also in the git repository.
 The schematics is very simple.
 {{ :project:maerklin:system_control:system_control_schematic.png?600 |}}
-These are the latest PCBs, which I created. The manufacturing is done by [[http://jlcpcb.com|JLCPCB]], but it's an empty PCB, so I need to add the components to it later.
+These are the latest PCBs, which I created. The manufacturing is done by [[sponsor:pcbway:start|]], but it's an empty PCB, so I need to add the components to it later.
 {{:project:maerklin:system_control:pcb_front.png?330 |}}