The Sub Board of the Can Satellite (“CANVAS”) functions as an expansion module primarily responsible for mission-specific equipment (e.g., camera) and wireless communication. It operates as a dedicated mission module connected to the main board.
Primary Functions of the Sub Board in CanSat
Mission Equipment Operation (Camera)
The ESP32-CAM module mounted at the bottom of the sub board enables image or video capture during flight.
Captured data can be stored on a microSD card or transmitted in real time.
Capture commands are received from the main board and executed by the camera on the sub board.
Wireless Communication
The ESP8266 ESP-07S module located at the top right is used for wireless communication with the ground station.
Connected to an external antenna, it transmits sensor and image data in real time.
Communication typically operates over the 2.4 GHz Wi-Fi band (802.11b/g/n).
Ground Station Integration and Recovery Support
The ESP8266 module can receive GPS or system status data and transmit it to the ground station, assisting in satellite tracking and post-mission recovery operations.
Functional Separation from the Main Board
While the main board focuses on data processing and sensor control, the sub board is dedicated to imaging and communication.
This separation improves operational efficiency and supports a modular system design.
Sub Board Components
Component | Function | Notes |
|---|---|---|
ESP32-CAM (Center) | Captures, stores, and transmits images/videos | Integrated with microSD card support |
ESP8266 ESP-07S (Right) | Handles Wi-Fi communication and data transmission | Operates on 2.4 GHz (802.11b/g/n) |
SMA Antenna Connector (Bottom) | Connects to external antenna for enhanced signal performance | Improves transmission/reception range |
Power Ports and Connectors | Interfaces with the main board for power and data lines | Ensures synchronized operation |
Sub Board – Example Operation Flow
The main board sends a “start capture” signal.
The ESP32-CAM module captures an image.
The captured image is either stored on the microSD card or transmitted via the ESP8266 module.
The ground station receives and reviews the data, enabling location tracking for recovery or securing experimental results.
The sub board serves as a mission-focused expansion module, primarily responsible for camera operation and wireless data transmission.
Working in coordination with the main board, it enables precise task distribution within the CanSat system.
Its modular design facilitates easy maintenance and future experimental upgrades.
