Light Intensity Meter Arduino

The computation is an exercise in ohm s law v ir.

Light intensity meter arduino.

When you finish building this project you will have a better understanding of how light meters work and you are going to see in action how powerful the arduino platform can be. In photometry this is used as a measure of the intensity as perceived by the human eye of light that hits or passes through a surface. The bh1750 ambient light intensity sensor breakout board has a 16 bit a2d converter built in that can directly output a digital signal. This year we will investigate light conditions to try to find insight into how light intensity affects not just our plants but also our own lives and those of our communities.

In this instructable i am going to show you how to build a light meter with a big nokia 5110 lcd display using arduino building a light meter is a great learning experience. Light measurement the easiest way to measure light with an arduino is with an ldr. Lx is the si derived unit of illuminance and luminous emittance measuring luminous flux per unit area in lame men s ter. Arduino diy light meter with bh1750 sensor.

Project design a luxmeter using a light dependent resistor december 13 2015 by david williams take a few minutes to characterize a light dependent resistor ldr and you can build a simple and reasonably accurate light meter can be built using an ldr and an arduino. When you finish building this project you will have a better understanding. Ldr s light dependent resistors have a low resistance in bright light and a. The output from the sensor is in lux lx and does not require advanced calculations in the sketch.

It is often used by photographers to determine the proper exposure for a photograph. In this tutorial i am going to show you how to build a light meter with a big nokia 5110 lcd display using arduino. Building a light meter is a great learning experience. Today we are going to build a simple light meter using an arduino board and a bh1750 digital light sensor.

The bh1750 communicates using i2c protocol. The design that i have chosen for the light meter is built from an arduino and associated parts. It is equal to one lumen per square meter. The ldr gives out an analog voltage when connected to vcc 5v which varies in magnitude in direct proportion to the input light intensity on it.

The measured lighting level or intensity is displayed on eight seven segment led displays in both lux and foot candle units. Since the ldr gives out an analog voltage it is connected to the analog input pin on the arduino. On the right of. V2 is what the arduino senses.

We need to compute r1 which will give us the light intensity in terms of v2.