1. Solution Overview

At the heart of every GIBO sensor sanitary ware product lies the A1 IR infrared control board — a universal sensing and control platform that provides the foundational intelligence for sensor faucets, flush valves, soap dispensers, and shower controls. The A1 implements GIBO Core Technology #1 (Active IR Reflection Sensing) and Core Technology #6 (Low-Power Multi-Stable Agile Sensing), delivering reliable touch-free activation in a compact, power-efficient form factor that is the building block for GIBO's entire product ecosystem.

The A1 board integrates IR emitter and receiver pairs, signal conditioning circuitry, an ultra-low-power MCU, and solenoid valve/pump driver outputs on a single PCB. Its modular design exposes standardized I/O interfaces — sensor input, valve/pump driver output, power input, and optional status LED — enabling rapid integration into customer-designed enclosure and plumbing configurations. For ODM partners, the A1 serves as the certified, field-proven control core around which entire product lines can be built.

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2. Performance Specifications

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3. Key Features

3.1 Active IR Reflection Sensing

The A1's IR sensing engine uses pulse-code modulated 940nm IR emission combined with synchronous detection at the receiver. Transmitting coded IR pulses rather than a continuous beam enables the receiver to distinguish its own reflected signal from ambient IR noise — sunlight, incandescent bulbs, and nearby IR remote controls. This modulation scheme is the key to reliable detection in real-world bathroom environments where ambient IR interference is ubiquitous.

3.2 Ultra-Low-Power Architecture

The A1 achieves its industry-leading 25μA standby current through a multi-layered power management strategy. The MCU spends >99% of its time in the deepest sleep state (consuming <1μA), waking every 200ms for a brief (~5ms) IR pulse and receiver sample. Between scans, all peripheral circuits — IR emitter, receiver amplifier, output drivers — are completely powered down. This aggressive duty cycling enables multi-year battery operation while maintaining responsive detection.

3.3 Adaptive Detection Algorithm

The onboard firmware implements an adaptive threshold algorithm that continuously monitors the baseline IR reflection level and adjusts the detection threshold to compensate for slow environmental changes — dust accumulation on the sensor window, gradual LED aging, and seasonal ambient light shifts. This self-calibration maintains consistent detection range over the product's entire service life without manual recalibration.

3.4 Universal Output Driver

The A1's output stage supports both latching solenoid valves (single 50ms pulse to toggle) and continuous solenoid valves (sustained drive for configured hold time), configurable via solder jumpers or firmware settings. This single-board compatibility with all common valve types simplifies inventory management for ODM customers building multiple product variants.

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IR Sensor Control Board Working Principle

The A1 control board's IR sensing operates on the principle of active infrared reflection, which is fundamentally different from passive infrared (PIR) motion detection used in security sensors. An IR LED (940nm wavelength, invisible to the human eye) emits brief pulses of infrared light through the sensor window. When a reflective object — most commonly a human hand — enters the detection zone, a portion of the emitted IR energy reflects back toward the board's IR photodiode receiver.

The key innovation in the A1's sensing chain is pulse-code modulated synchronous detection. The IR emitter transmits a specific coded pulse pattern rather than continuous illumination. The receiver's amplifier is gated synchronously with the emitter, meaning it only "listens" during the brief windows when reflected IR pulses are expected. Any IR energy arriving outside these windows — from sunlight, room lighting, or nearby devices — is rejected by the synchronous detector. This provides exceptional immunity to ambient IR interference that would overwhelm a simple continuous-wave IR sensor.

The entire sensing cycle — wake MCU, emit IR pulse, sample receiver, process signal, sleep — completes in under 10ms. With a 200ms scan interval, the sensor achieves a 5% duty cycle, directly translating to the 25μA average current that enables multi-year battery life. When a reflection exceeding the adaptive threshold is detected on two consecutive scans (debounce), the MCU asserts the output driver to activate the connected solenoid valve or pump.

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4. Application Scenarios

Sensor Faucet Core: The A1 is the standard control board for GIBO's B3, B4, and B6 series sensor faucet products, providing the IR sensing and valve control intelligence.

Flush Valve Controller: Paired with a latching solenoid valve, the A1 forms the control core for GIBO's B1 and B2 toilet flush assemblies.

Soap Dispenser Driver: Configured for peristaltic pump drive output, the A1 controls GIBO's C1 and C2 soap and foam dispenser modules.

ODM Integration Platform: For customers developing proprietary sensor sanitary ware products, the A1 provides a certified, field-proven control core that accelerates time-to-market while reducing certification costs.

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5. Compatible Products

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Data Source: GIBO official website (www.gibo.com.cn), product specifications, IR sensing technology white papers. Performance data verified through laboratory testing.

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Last Updated: 2026-06-14  |  GIBO  |  Sensor Faucet ODM Expert  |  www.gibo.com.cn