@conradsm To extend the IR range of your M5StickC Plus2 for TV control, here are the recommended hardware solutions based on official specifications and technical designs:
1. Official Recommended Solution: M5Stack Unit IR Module
The M5Stack Unit IR (infrared expansion module) is the most straightforward option. It integrates a transistor-based current amplification circuit to boost IR signal strength.
Key Advantages:
Plug-and-play: Connects via the Grove interface (HY2.0-4P port) on M5StickC Plus2.
Amplified发射设计: Uses an S8050 NPN transistor to amplify current, driving the IR LED with higher power than the built-in GPIO alone.
Proven Compatibility: Works seamlessly with M5StickC Plus2, requiring minimal wiring (only 4 pins: GND, 5V, IR_TX, IR_RX).
Expected Range: When used with Unit IR, the effective distance typically exceeds 5 meters (based on similar configurations like the BugC2 base test results of 5.6 meters at 180° angle).
2. Alternative: BugC2 Robot Base (SKU:K033-C)
If you need both IR range extension and mobility, the BugC2 base (a robot chassis for M5StickC Plus2) includes optimized IR hardware:
Integrates an SL0038GD IR receiver and enhanced发射电路.
Tested Range: Up to 5.6 meters (180° angle) when paired with StickC Plus2, which meets your "long-distance TV control" requirement.
3. DIY Enhancement (For Advanced Users)
If you prefer a custom solution, you can modify the IR circuit based on M5Stack’s reference designs:
Increase LED Current: Replace the built-in 100Ω current-limiting resistor with a smaller value (e.g., 10-50Ω) to boost IR LED power (ensure the LED’s maximum current rating is not exceeded).
Two-Stage Amplification: Use a MOSFET (e.g., AO3401A) alongside a transistor (like the M5GO Bottom base design) for higher power output.
Connection Notes:
Use GPIO19 (shared with the built-in red LED) to control the external IR circuit.
Power the external circuit via the Grove interface’s 5V pin (requires USB or external battery for stable 5V supply).
Summary of Recommendations
Solution
Complexity
Estimated Range
Best For
M5Stack Unit IR Module
Easy
5-6 meters
Plug-and-play extension
BugC2 Base (SKU:K033-C)
Moderate
5.6 meters
Mobile + long-range operation
DIY Circuit
Advanced
6+ meters
Custom power optimization
All these options should resolve your short-range issue. The Unit IR module is the simplest and most cost-effective choice for standalone range extension. Let me know if you need help with wiring diagrams or code adjustments!
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