Design A Luxmeter Using a Light Dependent Resistor 

Design A Luxmeter Using a Light Dependent Resistor 

April 1, 2023 448 Views


Topic: Lux Meter, Sensor, LF RFID 

Transcript Excerpt

This is the initial test setup with an elder connected over on the left into a breadboard with a voltmeter ohmmeter setup connected to the LDR to measure the resistance of the elder. And in the middle, users can see the lux meter with the sensor here and the display and notice as user shade the lux meter in the LDR. Light shining on it a little bit brighter and the resistance goes down and the lux goes up. So now what users going to do is under a number of different lighting conditions, so different shading, brighter light, shining directly on it, user will measure a number of different light levels along with the corresponding resistance levels that are given by the. The building the hardware for this lux meter is really simple. Users will plug an LCD shield into the top and then user have just connected the elder and a 5K resistor directly into the Arduino, or at least into the LCD shield. And now to power the Arduino to power user system, users going to use a battery at a simple USB battery here, plug it in and users have got their luxmeter running. Got a fairly bright light shining down on here, so it’s about 2300. Shaping up to 3000 bucks, so jumping out jumped around quite a bit as users move around and casting users shadow on the LDR. Now let’s take a look at the comparison between users Lux meter and a commercially available one. CLX 102 from Loutron. Users have tried to get the sensors as close together as possible, but there’s of course a chance that the shadows falling on one is a little bit different than the shadow falling on another, but users can see that the the lux between the difference between the two. It’s fairly minimal. Users are both jumping around a little bit as the as the shadows change, but users are all within 30 to 40 lux. If users do something like cast a shadow over them, users both drop down. Users don’t have a really bright light right now. Add one in. OK, so I’ve got a brighter light shining down on the two sensors now and users can notice the difference is a little bit more, maybe around 100 lux. Difference between the two. And there’s a good chance that’s because it’s just with user setup here, it’s harder for user to get the light shining directly on both the sensors in the same manner. So, user think what user could say in general is this lux meter user created from the elder is good enough if user just want to know sort of what the general levels of lights are in a room or at a bench where users are working, it’s not going to be enough to give users a calibrated measurement. But using a cheap elder, a simple setup with a nerd, we know users can get a half decent fluxmeter. 

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