Add Heltec Mesh Node T114 (#1449)

* Add Heltec Mesh Node T114

* fix Mesh Node T114:Basic introduction, firmware version information, pin map

* add t114 to sidebar and title

* trunk fmt

* updates

---------

Co-authored-by: rcarteraz <robert.l.carter2@gmail.com>

docs/hardware/devices/heltec-automation/index.mdx

@@ -24,7 +24,7 @@ Inexpensive basic ESP32-based boards.
 | ----------------------- | ----------- | ------ | ------------ | --- | --- |
 | [Capsule V3](./sensor/) | ESP32-S3FN8 | SX1262 | 2.4GHz b/g/n | 5.0 | YES |
 
-### [Vision Master](./vision-master/)
+## [Vision Master](./vision-master/)
 
 Versatile ESP32-S3-based boards E-Ink development boards.
 
@@ -33,3 +33,9 @@ Versatile ESP32-S3-based boards E-Ink development boards.
 | [Vision Master E213](./vision-master/?heltec=vision_master_e213) | ESP32-S3R8 | SX1262 | 2.4GHz b/g/n | 5.0 | NO  |
 | [Vision Master E290](./vision-master/?heltec=vision_master_e290) | ESP32-S3R8 | SX1262 | 2.4GHz b/g/n | 5.0 | NO  |
 | [Vision Master T190](./vision-master/?heltec=vision_master_t190) | ESP32-S3R8 | SX1262 | 2.4GHz b/g/n | 5.0 | NO  |
+
+## [Mesh Node](./mesh-node)
+
+| Name                                          | MCU      | Radio  | WiFi | BT  |   GPS    |
+| --------------------------------------------- | :------- | :----- | :--- | :-: | :------: |
+| [Mesh Node T114](./mesh-node/?mesh_node_t114) | nRF52840 | SX1262 | NO   | 5.0 | OPTIONAL |

docs/hardware/devices/heltec-automation/mesh-node/buttons.mdx

@@ -0,0 +1,17 @@
+---
+id: buttons
+title: Mesh Node Hardware Buttons
+sidebar_label: Buttons
+sidebar_position: 1
+---
+
+## Mesh Node T114
+
+- **RST Button:**
+  - **Single press:** Resets the device.
+  - **Double press:** The device enters download mode.
+- **User Button:**
+  - **Long press:** Will signal the device to shutdown after 5 seconds.
+  - **Single press:** Changes the information page displayed on the device's screen.
+  - **Double press:** Sends an adhoc ping of the device's position to the network.
+  - **Triple press:** Enables/Disables the GPS Module on demand. If an NPN Transistor is added it will cut power to the GPS board. The NPN pin must be configured on the PIN_GPS_EN inside the Position module in the App for this switching to work.

docs/hardware/devices/heltec-automation/mesh-node/index.mdx

@@ -0,0 +1,65 @@
+---
+id: mesh-node
+title: HELTEC® Mesh Node
+sidebar_label: Mesh Node
+sidebar_position: 4
+---
+
+import Tabs from "@theme/Tabs";
+import TabItem from "@theme/TabItem";
+
+<Tabs
+groupId="heltec"
+queryString="heltec"
+defaultValue="mesh_node_t114"
+values={[
+{label: 'Mesh Node T114', value: 'mesh_node_t114'}
+]}>
+<TabItem value="mesh_node_t114">
+
+## Mesh Node T114
+
+- **MCU:**
+  - nRF52840 (Bluetooth)
+- **LoRa Transceiver:**
+  - Semtech SX1262
+- **Frequency Options:**
+  - 433 MHz
+  - 470 - 510 MHz
+  - 863 - 870 MHz
+  - 902 - 928 MHz
+- **Connectors:**
+  - USB-C
+  - 2x1.25 lithium battery interface
+  - 2x1.25 solar panel interface
+  - 8x1.25 GNSS interface
+  - Antenna:
+    - U.FL/IPEX antenna connector for LoRa.
+    - Integrated 2.4 GHz patch antenna.
+
+### Features
+
+- Onboard 1.14 inch TFT-LCD display is optional.
+- GPS module is optional.
+- Excellent low power characteristics.
+
+### Flashing
+
+1. Trigger DFU mode manually by double-clicking RST button.
+
+2. Send or paste the prepared firmware UF2 file into the device.
+
+### Pin Map
+
+![Mesh_Node_T114_PIN_MAP](/img/hardware/heltec/Mesh_Node_T114_PIN_MAP.webp)
+
+### Resources
+
+- Firmware file: `firmware-heltec-mesh-node-t114-X.X.X.xxxx.uf2`
+- Purchase links
+  - International
+    - [Heltec](https://heltec.org/project/mesh-node-t114/)
+    - [AliExpress](https://www.aliexpress.com/item/1005007460963705.html)
+
+</TabItem>
+</Tabs>

docs/hardware/devices/index.mdx

@@ -146,6 +146,12 @@ Versatile ESP32-S3-based boards E-Ink development boards.
 | [Vision Master E290](./heltec-automation/vision-master/?heltec=vision_master_e290) | ESP32-S3R8 | SX1262 | 2.4GHz b/g/n | 5.0 | NO  |
 | [Vision Master T190](./heltec-automation/vision-master/?heltec=vision_master_t190) | ESP32-S3R8 | SX1262 | 2.4GHz b/g/n | 5.0 | NO  |
 
+### [Mesh Node](./heltec-automation/mesh-node)
+
+| Name                                                            | MCU      | Radio  | WiFi | BT  |   GPS    |
+| --------------------------------------------------------------- | :------- | :----- | :--- | :-: | :------: |
+| [Mesh Node T114](./heltec-automation/mesh-node/?mesh_node_t114) | nRF52840 | SX1262 | NO   | 5.0 | OPTIONAL |
+
 ## [B&Q Consulting](./b-and-q-consulting/)
 
 ### [Nano Series](./b-and-q-consulting/nano/)
@@ -241,6 +247,6 @@ DIY kit with ESP32, LoRa chip, and optional GPS. Designed for STEM education.
 
 ### Radio Master
 
-| Name                  | MCU              | Radio  | WiFi | BT  | GPS |
-| :-------------------- | :--------------- | :----- | :--: | :-: | :-: |
-| Bandit Nano ExpressLRS 900 | ESP32 | SX1276 + SKY66122 PA/LNA +30db TX, +16db RX ) | ?  | YES | NO  |
+| Name                       | MCU   | Radio                                         | WiFi | BT  | GPS |
+| :------------------------- | :---- | :-------------------------------------------- | :--: | :-: | :-: |
+| Bandit Nano ExpressLRS 900 | ESP32 | SX1276 + SKY66122 PA/LNA +30db TX, +16db RX ) |  ?   | YES | NO  |