W55RP20 smart doorbell

A smart camera doorbell where W55RP20 controls a vision NPU. It texts user when a stranger is detected.

COMPONENTS Hardware components

WIZnet - W55RP20

x 1

Seeedstudio - Grove Vision AI Module

x 1

SOLOMON SYSTECH - Monochrome 0.96" 128x64 OLED Graphic Display

x 1

Software Apps and online services

Arduino - Arduino IDE

x 1

PROJECT DESCRIPTION

W55RP20 Smart Doorbell

The W55RP20 smart doorbell proof-of-concept integrates the W55RP20-Arduino platform with the Seeed Studio Grove AI Vision V2 module to deliver intelligent tenant recognition and real-time notifications. The Grove AI Vision V2 performs on-device image classification, distinguishing between known tenants and strangers at the door. Once classification is complete, the W55RP20-Arduino acts as the communication gateway, triggering a secure message dispatch. Through its Ethernet interface, the W55RP20 sends a WhatsApp notification directly to the user’s mobile device, ensuring immediate awareness of visitor identity. This modular design demonstrates a scalable approach to combining embedded vision and IoT messaging for smart home security.

System diagram

Hardware

Components

- W55RP20-arduino

- Grove Vision AI Module V2

- 0.96 Inch OLED SSD1306 White 128X64 I2C Module

pin assignments

PCBA photo

Prerequisite

1. Follow the instruction on https://sensecraft.seeed.cc/ai/home to install the Pet Detection AI model on the Grove Vision AI Module V2

https://sensecraft.seeed.cc/ai/view-model/60084-pet-detection

2. Install Arduino IDE v2.3.6+ for Arduino on PC

3. Install ArduProf v2.2.4+, by teamprof on Arduino IDE

4. Install Seeed Arduino SSCMA by Seeed Studio on Arduino IDE

note v1.0.3 does NOT work. A pull-request is submitted on 19 Apr 2026.

Please modify Seeed_Arduino_SSCMA.cpp by yourself, before the pull-request is accepted

int SSCMA::invoke(int times, bool filter, bool show)
{
    ...

    snprintf(cmd, sizeof(cmd), CMD_PREFIX "%s=%d,%d,%d" CMD_SUFFIX,
-             CMD_AT_INVOKE, times, !filter, filter); // AT+INVOKE=1,0,1\r\n
+             CMD_AT_INVOKE, times, filter, !show);  // AT+INVOKE=1,0,1\r\n
    write(cmd, strlen(cmd));

    ...
}

note: a cloned Seeed_Arduino_SSCMA is available at https://github.com/teamprof/Seeed_Arduino_SSCMA which will be removed after it accepted the pull-request.

Steps to run

Build firmware

- Follow the instruction on https://www.callmebot.com/blog/free-api-whatsapp-messages/ to get the APIKey

- Clone this github code by "git clone https://github.com/teamprof/w55rp20-smart-doorbell"

- Open the w55rp20-smart-doorbell.ino in Arduino IDE

- Open the secret.h file and replace the placeholder values with your mobile number and the API key provided by CallMeBot

#define MOBILE_NUMBER "<MobileNumber>"
#define APIKEY "<ApiKey>"

- On Arduino IDE, click menu "Tools" -> "Board: " -> "Board Manager..." -> "WIZnet W55RP20-EVB-Pico"

- On Arduino IDE, click menu "Tools" -> "Debug Port" -> "Serial"

- On Arduino IDE, click menu "Tools" -> "CPU Speed" -> "133 MHz"

- On Arduino IDE, click menu "Tools" -> "Operation System" -> "FreeRTOS SMP"

- On Arduino IDE, click menu "Sketch" -> "Verify/Compile"

If everything goes smoothly, you should see the following screen.

Wiring and settings

- wiring "W55RP20-Arduino" - "Grove AI Vision V2" according to the session "pin assignments" above

- short "W55RP20-Arduino" J2.1 and J2.2 (IOREF = 3V3)

- open "W55RP20-Arduino" J3

- open "W55RP20-Arduino" J7

- short "W55RP20-Arduino" J8.2 and J8.3 (D2 = GPIO5 = I2C0_SCL)

- short "W55RP20-Arduino" J9.1 and J9.2 (D3 = GPIO4 = I2C0_SDA)

- put DIP switch 1 to ON state (start ThreadEth)

- put DIP switch 2 to ON state (start ThreadAi)

Flash firmware

- Connect W55RP20-Arduino to PC, upload firmware by clicking menu "Sketch" -> "Upload"

If everything goes smoothly, you should see the following screen.

Test firmware

- Launch "Serial Monitor" on Arduino IDE, press "RESET" button on the board, you should see the following screen.

- OLED display as below

- Connect an Ethernet cable between the board and router, you should see the following OLED display once Etheret is up and NTP is success

- show a "cat" image in front of the camera. OLED should display as below

an alert message "Tenant identified" should be received on WhatsApp app couple seconds later

- show a "dog" image in front of the camera. an alert message "Stranger detected" should be received on WhatsApp app

Video demo

Video demo is available on video

00:01 power up

00:13 put a "cat" image in front of the camera

00:48 WhatsApp received "tenant identified" message

01:04 put a "dog" image in front of the camera

01:22 WhatsApp received "stranger detected" message

Software flow

License

- The project is licensed under GNU GENERAL PUBLIC LICENSE Version 3

Copyright

Documents

w55rp20-smart-doorbell
source code

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