Ultralow Power Light Recognition System for Smart Agriculture (CN0397)
The circuit shown in Figure 1 uses three photodiodes that are sensitive to different wavelengths (red, green, and blue), to measure light intensity levels over the light spectrum where plants are photosynthetically active. The measured results can be used to optimize the light source to match the requirements of the specific plants, enhance the growth rate, and minimize energy losses.
This circuit uses three precision current to voltage conversion stages that drive a single-supply, low power, low noise, 16-bit, Σ-Δ analog-to-digital converter (ADC) with three differential inputs.
The circuit deviates from the traditional approach by eliminating all mechanical and optical components, and uses only electrical components to achieve the same goal.
The circuit consumes less than 10 mW typical, making it ideal for battery operated portable field applications.
The printed circuit board (PCB) is designed in an Arduino- compatible shield form factor and interfaces to the EVAL- ADICUP360 Arduino-compatible platform board for rapid prototyping.
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