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Clarify support for Heltec WiFi LoRa 32 V4 and V3

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Updated README to clarify support for Heltec V4 and V3.
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jrl290
2026-03-06 14:50:50 -05:00
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README.md
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# RTNode-HeltecV4 — Reticulum Transport Node for Heltec WiFi LoRa 32 V3 / V4 # RTNode-HeltecV4 — Reticulum Transport Node for Heltec WiFi LoRa 32 V4 (with support for V3)
A custom firmware for the **Heltec WiFi LoRa 32 V3** and **V4** (ESP32-S3 + SX1262) that operates as a **Transport Node** — bridging a local LoRa radio network with a remote TCP/IP backbone (such as [rmap.world](https://rmap.world)) over WiFi. A custom firmware for the **Heltec WiFi LoRa 32 V4** (ESP32-S3 + SX1262) that operates as a **Transport Node** — bridging a local LoRa radio network with a remote TCP/IP backbone (such as [rmap.world](https://rmap.world)) over WiFi.
``` ```
Android / Sideband Remote Android / Sideband Remote
@@ -32,7 +32,7 @@ Built on [microReticulum](https://github.com/attermann/microReticulum) (a C++ po
## Hardware ## Hardware
Both the **Heltec WiFi LoRa 32 V3** and **V4** are supported. These boards were chosen for their ample flash and LoRa capabilities. PSRAM availability varies — the V4 ships with 2 MB PSRAM, while the V3 uses the ESP32-S3FN8 which has **no PSRAM**. The firmware **detects PSRAM at runtime** and allocates the TLSF memory pool from SPIRAM when available, falling back to internal SRAM (~170 KB) on boards without PSRAM. This firmware was designed for the **Heltec WiFi LoRa 32 V4**. This board was chosen for its 2MB PSRAM and LoRa capabilities. While the V3 is supported, it uses the ESP32-S3FN8 which has **no PSRAM**. The firmware **detects PSRAM at runtime** and allocates the TLSF memory pool from SPIRAM when available, falling back to internal SRAM (~170 KB) on boards without PSRAM.
| Component | Heltec V3 | Heltec V4 | | Component | Heltec V3 | Heltec V4 |
|-----------|-----------|----------| |-----------|-----------|----------|