I. Core Positioning and Scenario Requirements

　　Solution Core Objectives

　　The 2G projector is designed with "low cost + basic connectivity + practical projection" as its core. Leveraging the wide coverage of 2G networks (GPRS/EDGE), it addresses basic connectivity needs (such as remote device status query and simple control) in remote areas and entry-level scenarios, avoiding the cost of high-end configurations (such as 4K and 5G). It is suitable for entry-level home use, rural education, and small business promotions.

　　Key Requirements Anchored

　　Networking Requirements: Supports basic 2G network communication (20-100kbps), enabling remote power on/off, device fault reporting, and incremental firmware updates. High-speed data transmission is not required (for example, wireless projection still primarily relies on local Bluetooth).

　　Projection Performance: Focuses on "720P/1080P basic resolution + 1000-2000 ANSI lumens brightness," suitable for small spaces of 10-30 square meters (such as bedroom viewing or classroom teaching), with noise levels ≤30dB.

　　Cost Control: The overall bill of materials (BOM) cost is 30%-40% lower than mid-range and high-end models. This is achieved through a simplified optical system, entry-level chips, and the integration of low-cost 2G modules.

　　Target Scenario Characteristics

　　Remote Area Education: Multimedia teaching in rural schools requires stable internet connectivity to report device operating status (e.g., bulb life, fault codes) for centralized management.

　　Entry-Level Home Use: Basic viewing for budget-conscious users (e.g., watching TV series and children's animations), with support for 2G remote control (e.g., remote power-up and preheating by family members).

　　Small Businesses: Self-employed individuals promoting products (e.g., playing product videos in stores), requiring low cost and low maintenance. 2G functionality is used to remotely verify device operation.

　　II. Hardware Solution

　　Core Module Selection and Design

　　2G Communication Module:

　　A low-cost, industrial-grade 2G module (supporting GPRS/EDGE protocols and covering the mainstream 900/1800MHz frequency bands) with an integrated SIM card slot (supporting Micro SIM cards) and a 3.3V-5V supply voltage is selected. Power consumption is controlled to ≤5mA in standby mode and ≤300mA in communication mode to avoid additional power burden. The module communicates with the motherboard via a UART interface, with a reserved reset pin for restarting in the event of a fault.

　　Optical and Imaging Module:

　　The light source uses an entry-level LED (lifespan 10,000-15,000 hours, 50% lower cost than lasers) with a brightness of 1,000-2,000 ANSI lumens. The imaging chip is compatible with either a 0.33-inch DMD chip (1080p resolution) or a 0.23-inch DMD chip (720p resolution). The lens adopts a fixed-focus design (throw ratio 1.2:1, simplifying the optical structure) to reduce cost and size.

　　Motherboard and Power Supply Design:

　　The motherboard utilizes a 4-layer PCB (2-4 layers fewer than the flagship model), integrating basic power management (supporting a wide voltage range of 100-240V, with standby power consumption ≤1W), Bluetooth 4.2 (for local screen projection), and a 2G module interface. High-cost interfaces like HDMI 2.1 are omitted (retaining only HDMI 1.4 and USB 2.0). The core chip uses an entry-level controller (supporting basic image processing, such as keystone correction ±30°), reducing computing power costs.

　　Structure and Heat Dissipation:

　　The housing is constructed of a single ABS material (reducing costs by 20% compared to ABS+PC), measuring no more than 250mm×200mm×100mm for easy transport. A simplified "single fan + heat sink" solution is used for heat dissipation. The core components (light source, controller) maintain a heat dissipation area of ≥80cm², maintaining a temperature below 70°C (enabling long-term low-load operation).

　　Hardware Compatibility and Stability

　　2G Module Compatibility: Supports 2G SIM cards from various carriers (China Mobile, China Unicom, etc.), with a reserved frequency band switching pin to adapt to different regional networks (e.g., some regions only support 900MHz);

　　Power Supply Stability: The power module has added overvoltage and overcurrent protection, and a 100μF capacitor is connected in series with the 2G module power supply to prevent voltage fluctuations during communication from affecting projection performance;

　　Anti-Interference Design: The 2G module is kept ≥5mm away from RF-sensitive components (such as the Bluetooth antenna), and a grounding copper foil is installed around the module to reduce image quality artifacts caused by communication interference.

　　III. Software Solution

　　2G Core Function Development

　　Remote Basic Control: Receives simplified commands (such as "power on/off," "brightness adjustment," and "fault query") via the 2G network. Command data packets are kept within 100 bytes (to accommodate the low 2G bandwidth) and response latency is ≤5 seconds.

　　Device Status Reporting: Periodically (e.g., every 24 hours) uploads device data (such as cumulative usage time, remaining lamp life percentage, and current operating mode) via 2G. Data volume is ≤500 bytes per transaction to avoid data waste.

　　Firmware Incremental Updates: Only core functional patches (such as bug fixes) are updated. Update package size is kept within 1MB (download time ≤3 minutes on a 2G network). Downloads can be resumed to prevent device failures caused by update interruptions.

　　Basic Projection Functionality Optimizations

　　Local Interaction: The operating system has been simplified (e.g., no app store, only local video playback and HDMI input functions are retained), and the UI has been made lightweight (with fewer animations) to suit entry-level user habits.

　　Screencasting: Only local Bluetooth projection is supported (speeds sufficient for 720P video transmission), eliminating the need for a Wi-Fi module (to reduce costs). Projection latency is kept below 200ms, meeting daily viewing needs.

　　Energy-Saving Mode: A new "2G Low Power Mode" has been added. After 30 minutes of inactivity, the brightness is automatically reduced to 50%, and the 2G module enters standby mode (power consumption ≤ 5mA), extending battery life (for portable models).

　　Data Security and Stability

　　Command Encryption: Control commands transmitted over 2G use a simple encryption algorithm (e.g., Base64 + checksum) to prevent misoperation or malicious commands.

　　Network Disconnection Tolerance: When the 2G network is disconnected, the device automatically saves unreported status data and prioritizes uploading it after the network is restored. If commands are received during a network outage, they are temporarily stored locally for execution upon reconnection to prevent functional failure.

　　IV. Production and Quality Control Adaptation

　　Production Simplification and Cost Control

　　Supply Chain: For core components (2G modules and entry-level DMD chips), select one or two key suppliers and sign bulk purchasing agreements (reducing unit prices). For auxiliary components (e.g., fans and connectors), select generic models to reduce customization costs.

　　Production Line: Simplified assembly processes (reducing 3-5 workstations compared to flagship models). Optical tuning focuses solely on calibrating brightness uniformity (deviation ≤ 10%), eliminating color precision calibration (reducing labor hours). The target yield for mass production is ≥ 98%.

　　Targeted Quality Control Points

　　2G Communication Testing: Each product must pass a 2G network test (simulating a weak signal environment in remote areas, with a signal strength of ≤-90dBm) to ensure a ≥95% success rate for command reception and data reporting.

　　Low-Load Stability: Continuous operation at 45°C for 8 hours (simulating extended classroom use) with a brightness decay of ≤8% and no disconnection of the 2G module.

　　Compatibility Testing: Compatibility with 2G SIM cards from different carriers (at least three) to test network stability and prevent functional failures caused by carrier frequency band differences.

　　Certification and Compliance

　　Mandatory Certification: In addition to 3C, CE, and FCC certifications, additional 2G communication-related certifications (such as China CTA and EU CE R&TTE) must be passed to ensure network communication compliance.

　　Energy Efficiency Certification: Meets China Level 2 energy efficiency standards (standby power consumption ≤1W). Applications in remote areas can qualify for energy-saving subsidies, enhancing market competitiveness.

　　V. Scenario-Based Implementation Suggestions

　　Remote Education Scenarios

　　Function Customization: Add "Education Mode" (fixed brightness of 1500 ANSI lumens, entertainment functions disabled). 2G functionality focuses on "Automatic Device Fault Reporting" (e.g., prompting an alert when the bulb life drops below 20%), facilitating centralized management by the Education Bureau.

　　Supporting Services: Provide a pre-installed SIM card service (including one year of basic data, monthly data usage ≤10MB) to reduce operational complexity for schools.

　　Entry-Level Home Scenarios

　　Function Simplification: Retain only "video playback, HDMI input, and Bluetooth screen projection" functions. 2G functionality only supports "remote power on and off" (e.g., users can remotely power on the device before leaving get off work and use it immediately upon returning home), eliminating complex operations.

　　Cost Pricing: The device is priced between 1500 and 2500 yuan, focusing on high cost-effectiveness. It comes with a simple projection screen (reducing user expenses).

　　Small Merchant Scenarios

　　Functional Adaptation: Supports looping promotional videos via USB. 2G functionality allows for remote viewing of playback status (e.g., proper boot-up and playback duration), eliminating frequent store visits.

　　Durability Improvements: The housing has been given a scratch-resistant coating, and the power module has been enhanced to withstand voltage fluctuations (to accommodate unstable power supplies in some merchants), reducing maintenance frequency.

　　Pitfall Avoidance Tips: ① 2G modules should be tested in advance for network coverage in the target area (e.g., some mountainous areas only support the 900MHz band) to avoid frequency band mismatches that could lead to communication failures. ② Firmware update packages should be kept small (over 1MB will cause 2G downloads to time out). Incremental updates are preferred. ③ Cost control should balance performance with performance (e.g., avoid oversimplifying heat dissipation, as this will shorten the light source life and increase after-sales costs).

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