Adding the RAK13300 / RAK11200 ESP32 pair variant by andyshinn · Pull Request #800 · meshcore-dev/MeshCore

andyshinn · 2025-09-17T15:49:23Z

This is mostly a copy of RAK4631 as a base and then modeled after the Heltec ESP32 variants. Needed the min spiffs partition since it is a little too large to fit on the default.

One issue I have right now is that it takes a bit of time to boot with errors from I2C:

[  6415][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263
[  7422][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263
[  8429][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263
[  9436][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263
[ 10443][E][Wire.cpp:513] requestFrom(): i2cRead returned Error 263

I am not sure if that is a sensor issue or not. Would like some guidance on the I2C errors.

andyshinn · 2025-09-20T16:44:47Z

Per Discord message it is possible that the I2C errors are normal. Opening for review and feedback.

andyshinn · 2025-09-24T18:00:28Z

Fixed the pin assignment and also disabled some sensors causing long startup times and adjusted the voltage multiplier to be closer to real measurements.

zenire · 2025-12-13T21:07:59Z

Any support/help needed to get this merged? Running this on my RAK13300/RAK11200 right now and working fine.

Copilot

Pull request overview

This pull request adds support for the RAK11200 WisBlock ESP32 module paired with the RAK13300 LoRa module (SX1262). The implementation follows the pattern of similar ESP32-based variants like Heltec boards and uses the RAK4631 as a base reference. The variant includes configuration for LoRa communication, I2C sensors, GPIO mappings, and uses the min_spiffs partition scheme to accommodate the 4MB flash limitation.

Changes:

Added RAK11200 board variant files including pin definitions, board-specific class, and build configurations
Configured SX1262 radio with DIO2 as RF switch and 1.8V TCXO
Created PlatformIO build environments for repeater, room server, companion radio (USB/BLE), terminal chat, and sensor applications

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
variants/rak11200/variant.h	Pin definitions and WisBlock GPIO mappings for RAK11200 + RAK13300
variants/rak11200/target.h	Header declarations for radio driver, board, sensors, and RTC
variants/rak11200/target.cpp	Implementation of radio initialization and configuration functions
variants/rak11200/platformio.ini	Build configurations for multiple RAK11200 application environments
variants/rak11200/pins_arduino.h	Arduino-compatible pin mappings for the RAK11200
variants/rak11200/RAK11200Board.h	Board class definition with LoRa pin assignments and battery monitoring
variants/rak11200/RAK11200Board.cpp	Board initialization and battery voltage reading implementation
boards/wiscore_rak11200.json	PlatformIO board definition with ESP32 specifications

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Copilot · 2026-01-21T03:28:02Z

+#define I2C_SDA 21
+#define I2C_SCL 22


The I2C pins defined here (SDA=21, SCL=22) conflict with the platformio.ini configuration (PIN_BOARD_SDA=4, PIN_BOARD_SCL=5) and pins_arduino.h (SDA=4, SCL=5). This inconsistency is likely the root cause of the I2C errors mentioned in the PR description. According to the RAK11200 documentation, the correct I2C pins should be GPIO4 (SDA) and GPIO5 (SCL). Please update these values to match the other files.

Suggested change

#define I2C_SDA 21

#define I2C_SCL 22

#define I2C_SDA 4

#define I2C_SCL 5

Copilot · 2026-01-21T03:28:03Z

+#define LED_PIN_2 2         // WB_LED2 - Secondary LED
+
+// LoRa radio module pins for RAK11200 + RAK13300 SX1262
+#define P_LORA_DIO_1   22   // WB_IO6 - DIO1 interrupt pin


Pin conflict detected: P_LORA_DIO_1 is assigned to GPIO22, which is the same pin as WB_IO6 (line 53). Additionally, GPIO22 is defined as I2C_SCL at line 7. This creates a three-way pin conflict. According to the RAK13300 documentation and WisBlock slot mapping, DIO1 should typically be on WB_IO6 (GPIO22), but I2C_SCL should be on GPIO5. Please resolve this conflict by correcting the I2C pin definitions.

Copilot · 2026-01-21T03:28:03Z

+#define  P_LORA_RESET   23    // GPIO23 (ESP32 pin 37 -> IO4/NRESET)
+#define  P_LORA_BUSY    13    // GPIO13 (ESP32 pin 16 -> IO5)


P_LORA_BUSY is redefined here as GPIO13, which conflicts with the definition in variant.h (line 28) where it's set to RADIOLIB_NC. The RAK11200Board.h definition should be removed or both files need to be aligned. According to the RAK13300 module documentation, if BUSY is connected, it should be on WB_IO5 (GPIO13), but variant.h indicates it's not connected (RADIOLIB_NC). Please clarify the actual hardware configuration and make these definitions consistent.

Suggested change

#define P_LORA_RESET 23 // GPIO23 (ESP32 pin 37 -> IO4/NRESET)

#define P_LORA_BUSY 13 // GPIO13 (ESP32 pin 16 -> IO5)

#define P_LORA_RESET 23 // GPIO23 (ESP32 pin 37 -> IO4/NRESET)

#ifndef P_LORA_BUSY

#define P_LORA_BUSY 13 // GPIO13 (ESP32 pin 16 -> IO5)

#endif

Copilot · 2026-01-21T03:28:03Z

+void RAK11200Board::begin() {
+  ESP32Board::begin();
+
+  pinMode(PIN_VBAT_READ, INPUT);
+
+  pinMode(SX126X_POWER_EN, OUTPUT);
+  digitalWrite(SX126X_POWER_EN, HIGH);
+  delay(10);   // give sx1262 some time to power up
+
+#ifdef PIN_USER_BTN
+  pinMode(PIN_USER_BTN, INPUT_PULLUP);
+#endif
+
+#ifdef PIN_USER_BTN_ANA
+  pinMode(PIN_USER_BTN_ANA, INPUT_PULLUP);
+#endif
+}


The RAK11200Board::begin() method is missing a call to Wire.begin(). While ESP32Board::begin() already calls Wire.begin() with PIN_BOARD_SDA and PIN_BOARD_SCL, this board class doesn't call the parent begin() method. Without calling ESP32Board::begin(), the I2C bus will not be initialized, which explains the I2C errors mentioned in the PR description. Add ESP32Board::begin() as the first line of this method.

Copilot · 2026-01-21T03:28:03Z

+#define  P_LORA_MOSI    25    // GPIO25 (ESP32 pin 10 -> SPI_MOSI)
+#define  SX126X_POWER_EN  27    // GPIO27 (ESP32 pin 12 -> IO2)
+#define  PIN_VBAT_READ    36    // WB_A0 for battery reading
+#define  ADC_MULTIPLIER   (3 * 1.73 * 1.110 * 1000)


Inconsistent ADC_MULTIPLIER values: variant.h defines it as 1.85 (line 20) while RAK11200Board.h defines it as (3 * 1.73 * 1.110 * 1000) which equals approximately 5763.9. These values are dramatically different and will result in incorrect battery voltage readings. According to the WisBlock RAK11200 documentation and similar RAK boards, the ADC_MULTIPLIER should typically account for the voltage divider ratio and ADC characteristics. Please verify the correct voltage divider configuration and use a consistent value across both files.

Suggested change

#define ADC_MULTIPLIER (3 * 1.73 * 1.110 * 1000)

#define ADC_MULTIPLIER 1.85f

Copilot · 2026-01-21T03:28:04Z

+  "connectivity": [
+    "wifi",
+    "bluetooth",
+    "ethernet",


The RAK11200 module does not have Ethernet capability. The connectivity list incorrectly includes "ethernet" alongside wifi, bluetooth, and CAN. According to the RAK11200 datasheet, it only supports WiFi 2.4GHz (802.11b/g/n) and Bluetooth 5.0. Please remove "ethernet" from the connectivity array.

Suggested change

"ethernet",

Copilot · 2026-01-21T03:28:04Z

+    "ethernet",
+    "can"


The RAK11200 module does not have CAN (Controller Area Network) capability. The connectivity list incorrectly includes "can" alongside wifi and bluetooth. According to the RAK11200 datasheet, it only supports WiFi 2.4GHz (802.11b/g/n) and Bluetooth 5.0. Please remove "can" from the connectivity array.

Suggested change

"ethernet",

"can"

"ethernet"

weebl2000 · 2026-03-04T22:23:45Z

@andyshinn do you still want this variant? If so I can help you tidy up and get this merged.

andyshinn · 2026-03-05T02:00:28Z

It would be nice to have, yes!

weebl2000 · 2026-03-05T02:25:47Z

It would be nice to have, yes!

Made a PR to your fork andyshinn#1 - if you merge that I think this will be good to go.

andyshinn · 2026-03-05T03:12:36Z

Thanks!

weebl2000 · 2026-03-05T03:14:02Z

Closed in favor of #1925 - all PR comments are addressed there.

andyshinn force-pushed the ashinn/rak11200-support branch from de189e5 to 00425c2 Compare September 17, 2025 15:57

andyshinn marked this pull request as ready for review September 20, 2025 16:44

ripplebiz reviewed Sep 23, 2025

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Comment thread variants/rak11200/RAK11200Board.h Outdated

andyshinn force-pushed the ashinn/rak11200-support branch from 0c53a63 to 1795fc2 Compare December 1, 2025 01:57

andyshinn added 4 commits January 20, 2026 21:24

adding the RAK13300 / RAK11200 ESP32 variant pair

930b92f

LORA_BUSY is actually connected, oops

13c869a

disable some sensors we don't use that have long timeouts on boot

17bf30f

better default multiplier for ESP32 RAK

f59e2b5

Copilot AI review requested due to automatic review settings January 21, 2026 03:24

andyshinn force-pushed the ashinn/rak11200-support branch from 1795fc2 to f59e2b5 Compare January 21, 2026 03:24

Copilot started reviewing on behalf of andyshinn January 21, 2026 03:24 View session

Copilot AI reviewed Jan 21, 2026

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weebl2000 mentioned this pull request Mar 5, 2026

Add RAK11200 / RAK13300 variant #1925

Open

andyshinn closed this Mar 5, 2026

		#define P_LORA_RESET 23 // GPIO23 (ESP32 pin 37 -> IO4/NRESET)
		#define P_LORA_BUSY 13 // GPIO13 (ESP32 pin 16 -> IO5)

	#define ADC_MULTIPLIER (3 * 1.73 * 1.110 * 1000)
	#define ADC_MULTIPLIER 1.85f

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