diff --git a/proto/wippersnapper/i2c/v1/i2c.proto b/proto/wippersnapper/i2c/v1/i2c.proto
index c89b841..7b1cdc1 100644
--- a/proto/wippersnapper/i2c/v1/i2c.proto
+++ b/proto/wippersnapper/i2c/v1/i2c.proto
@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: 2021 Brent Rubell for Adafruit Industries
+// SPDX-FileCopyrightText: 2021-2025 Brent Rubell for Adafruit Industries
 // SPDX-License-Identifier: MIT
 syntax = "proto3";
 
@@ -93,6 +93,8 @@ message I2CDeviceInitRequest {
   uint32 i2c_device_address                                 = 3; /** The 7-bit I2C address of the device on the bus. */
   string i2c_device_name                                    = 4[(nanopb).max_size = 15]; /** The I2C device's name, MUST MATCH the name on the JSON definition file on https://github.com/adafruit/Wippersnapper_Components. */
   repeated I2CDeviceSensorProperties i2c_device_properties  = 5[(nanopb).max_count = 15]; /** Properties of each sensor on the I2C device. */
+  bool is_output_device                                     = 6; /** True if the I2C device is an I2C output device, False otherwise (default). */
+  I2COutputAdd i2c_output_add                               = 7; /** The configuration for an I2C output device. */
 }
 
 /**
@@ -205,3 +207,98 @@ message I2CDeviceEvent {
   uint32 sensor_address              = 1; /** The 7-bit I2C address of the I2C device. */
   repeated SensorEvent sensor_event  = 2[(nanopb).max_count = 15]; /** A, optionally repeated, SensorEvent from a sensor. */
 }
+
+/**
+* I2CDeviceOutputWrite represents a request to write to an I2C output device.
+* NOTE: This message is similar to the I2CDeviceOutputWrite message on
+* the api-v2 branch but NOT identical.
+*/
+message I2CDeviceOutputWrite {
+  uint32 i2c_device_address             = 1; /** The 7-bit I2C address of the device on the bus. */
+  string i2c_device_name                = 2[(nanopb).max_size = 15]; /** The I2C device's name, MUST MATCH the name on the JSON definition file on https://github.com/adafruit/Wippersnapper_Components. */
+  oneof output_msg {
+    LEDBackpackWrite write_led_backpack = 3; /** Optional - If the I2C device is a LED backpack, fill this field. **/
+    CharLCDWrite write_char_lcd         = 4; /** Optional - If the I2C device is a character LCD, fill this field. **/
+    SSD1306Write write_ssd1306          = 5; /** Optional - If the I2C device is a SSD1306 OLED display, fill this field. **/
+  }
+}
+
+///*** I2C Output Device Messages (from i2c_output.proto in api v2) ***///
+
+/**
+* LEDBackpackAlignment represents all text alignment
+* options for LED backpack displays
+*/
+enum LEDBackpackAlignment {
+  LED_BACKPACK_ALIGNMENT_UNSPECIFIED = 0; /** Unspecified alignment option. **/
+  LED_BACKPACK_ALIGNMENT_LEFT        = 1; /** (Default) Left-aligned. **/
+  LED_BACKPACK_ALIGNMENT_RIGHT       = 2; /** Right-aligned. **/
+}
+
+/**
+* Desired SSD1306 text 'magnification' size.
+*/
+enum SSD1306TextSize {
+  SSD1306_TEXT_SIZE_UNSPECIFIED = 0; /** Unspecified text size. **/
+  SSD1306_TEXT_SIZE_1           = 1; /** Default text size, 6x8px. **/
+  SSD1306_TEXT_SIZE_2           = 2; /** Larger text size option, 12x16px. **/
+}
+
+/**
+* LEDBackpackConfig represents the configuration for a LED backpack display.
+*/
+message LEDBackpackConfig {
+  int32 brightness                = 1; /** Desired brightness of the LED backpack, from 0 (off) to 15 (full brightness). **/
+  LEDBackpackAlignment alignment  = 2; /** Desired text alignment for the LED backpack. **/
+}
+
+/**
+* CharLCDConfig represents the configuration for a character LCD display.
+*/
+message CharLCDConfig {
+  uint32 rows            = 1; /** Number of rows for the character LCD. **/
+  uint32 columns         = 2; /** Number of columns for the character LCD. **/
+}
+
+/**
+* SSD1306Config represents the configuration for a SSD1306 OLED display.
+*/
+message SSD1306Config {
+  uint32 width              = 1; /** Width of the display. **/
+  uint32 height             = 2; /** Height of the display. **/
+  SSD1306TextSize text_size = 3; /** Desired text 'magnification' size. **/
+}
+
+/**
+* I2COutputAdd represents a request from the broker to add an I2C output device to a device.
+*/
+message I2COutputAdd {
+  oneof config {
+    LEDBackpackConfig led_backpack_config = 1; /** Configuration for LED backpack. **/
+    CharLCDConfig char_lcd_config         = 2; /** Configuration for character LCD. **/
+    SSD1306Config ssd1306_config          = 3; /** Configuration for SSD1306 OLED display. **/
+  }
+}
+
+/**
+* LEDBackpackWrite represents a request from the broker to write a message to a LED backpack.
+*/
+message LEDBackpackWrite {
+  string message = 1 [(nanopb).max_size = 5]; /** Message to write to the LED backpack. **/
+}
+
+/**
+* CharLCDWrite represents a request from the broker to write to a character LCD.
+*/
+message CharLCDWrite {
+  string message         = 1 [(nanopb).max_size = 128]; /** Message to write to the character LCD. **/
+  bool enable_backlight  = 2; /** Optional field to enable/disable the backlight. Should be its own feed (0 is off, 1 is on).**/
+}
+
+/**
+* SSD1306Write represents a request from the broker to
+* write to a SSD1306 OLED display.
+*/
+message SSD1306Write {
+  string message = 1 [(nanopb).max_size = 128]; /** Message to write to a SSD1306 OLED display. **/
+}
\ No newline at end of file
diff --git a/proto/wippersnapper/signal/v1/signal.proto b/proto/wippersnapper/signal/v1/signal.proto
index 5f23754..305e848 100644
--- a/proto/wippersnapper/signal/v1/signal.proto
+++ b/proto/wippersnapper/signal/v1/signal.proto
@@ -73,6 +73,7 @@ message I2CRequest {
     wippersnapper.i2c.v1.I2CDeviceDeinitRequest req_i2c_device_deinit       = 5;
     wippersnapper.i2c.v1.I2CDeviceUpdateRequest req_i2c_device_update       = 6;
     wippersnapper.i2c.v1.I2CDeviceInitRequests req_i2c_device_init_requests = 7;
+    wippersnapper.i2c.v1.I2CDeviceOutputWrite req_i2c_device_out_write      = 8;
   }
 }