Are there any here (assuming a 10K resistor) that you would say one should avoid? Asking for help, clarification, or responding to other answers. GL5516 150 90 -30~+70 540 GL5528 150 100 -30~+70 540 GL5537-1 150 100 -30~+70 540 GL5537-2 150 100 -30~+70 540 GL5539 150 100 -30~+70 540 Φ5 series GL5549 150 100 -30~+70 540 . It’s not because it’s broken, but it’s because it’s resistance is small compared to the 10kΩ resistor which means it does not leave a lot of ‘bandwidth’ to show it’s capabilities. Well, I decided to connect these things, all at the same time and look at the readings. R = V/I = 0.8V / 0.25 mA = 3,200 Ω. 2. If we take the values it shows during daylight, inside the house: As you can see, the values are relatively stable. 1023 will be at 3.3V (in my case. Mobile phone is brighter than daylight? So connecting, how do we do that? You can my setup at the top. What's the current state of LaTeX3 (2020)? Were any IBM mainframes ever run multiuser? What I've done with my Raspberry PI and other electronics and how I did it. ( Log Out /  We also connect that same end to a resistor (in my diagram a 10K resistor) and the other end of the resistor to ground. Now go look for the data sheets and read them. Light Resistance at IOLux (at 250C) Dark Resistance at 0 Lux Gamma value at 100-10Lux Power Dissipation(at 250) Max Voltage (at 250) Spectral Response peak (at 250C) Maybe I will do some more readings where I take a resistor to match each photo resistor and see what the results are than. Let’s take the next step. How to Use a Photoresistor (or Photocell) - Arduino Tutorial: A photoresistor or photocell is a light-controlled variable resistor. Well, we need to understand (somewhat) Ohm’s law. Light dependent resistor (LDR) switched LED-circuit, Choosing Voltage Divider Resistor For LDR. Making statements based on opinion; back them up with references or personal experience. The reading is 496 which means it is reading a voltage of 775/1023*3.3V = 2.5V. ( Log Out /  The second thing to notice is that the 5506 does not really vary that much with light, especially compared to the others. So let’s take one of the values of the 5528, 775. Really helped me better understand photo resistors and the differences between them. Now we can calculate V at our analog input. Well this math is all fine, but what does this mean? Use MathJax to format equations. $2.99$ 2. Does an LED TV that is displaying “black” emit enough light to trigger an LDR? It only takes a minute to sign up. Let’s say the photo resistor currently has a resistance of 10KΩ. To measure the amount of light, we want to measure the resistance of the light sensor. First, I thought it was interesting to see that the values fluctuated with a normal bulb. What we are going to measure is the voltage at the point between the photo resistor and the normal resistor. So we know V. Now we need to know I and from that we can calculate R. We can calculate R because we know V and R for the other part of the setup, the 10KΩ. Change ), You are commenting using your Google account. I picked the 5537 somewhat at random, probably because that showed up in the most eBay searches for “Arduino Photoresistor” – from the tables above, it looks like it has a fairly large range and reasonable slope, which is what you really want. GL5516: 5-10: 0.5: GL5528: 10-20: 1: GL5537: 16-50: 2: GL5539: 30-90: 5: But how does that help in connecting these things? The resistance of a photoresistor decreases with increasing incident light intensity. I = 5V / 40KΩ = 0.125 mAVoltage drop over photo resistor = 0.125 mA * 30KΩ = 3.75 V Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. GL5516: 5-10: 0.5: GL5528: 10-20: 1: GL5537: 16-50: 2: GL5539: 30-90: 5: But how does that help in connecting these things? Let me quickly share the setup and the code I used to test the resistors. The GL5506 has a significantly lower resistance for a given amount of light compared to the GL5516 AND, in dark conditions the resistance of the GL5516 is significantly higher in resistance (as you would expect). All black wires are +3.3V, all the white are ground and the different colors are for each of the analog inputs. This sample was not an incident, it was doing that the whole time. What is the difference between gl5516 and gl5506? Looking for a function that approximates a parabola. $7.89 (50 Pcs) MCIGICM 1uf 50V electrolytic Capacitor 4×7mm 4.9 out of 5 stars 28. Let’s recalculate: Total R = 30KΩ + 10KΩ = 40KΩ Ohm’s law states V=IR, voltage is current times resistance. Well, current will flow from +5V over the photo resistor, continue over the 10K resistor and than to ground. I have added a header row every 10 rows so I can copy and paste that: Available on GitHub with more comment in the code. Change ). It is an Arduino Nano (which has 5 analog ports) and the 5 sensors, the bottom is the 5506 and moving up all the way to the 5539 at the top. GL5516 150 90 -30~+70 540 GL5528 150 100 -30~+70 540 GL5537-1 150 100 -30~+70 540 GL5537-2 150 100 -30~+70 540 GL5539 150 100 -30~+70 540 GL5549 150 100 -30~+70 540 . DO you concur that the 5537 looks good? Well, that’s quite a broad range and not really useful for calculating the amount of lux but the deviation of these sensors might vary piece to piece but do not vary that much per piece, so if your sample decides to be more towards the dark side, it will be there with higher or lower light settings as well. How to avoid LDR controlled light self-latching? Thanks again for doing the work and providing the raw data…. 99 ($0.25/10 Items) FREE delivery. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. We can calculate the total current that flows from +5V to ground by adding the resistors and plugging it in Ohm’s law. A A A GL5528 Epoxy encapsulated Quick response Small size High sensitivity Reliable performance Good characteristic of spectrum Outline 36 ± 2 4.3 0.2 Illuminance Vs. Photo Resistance 1000 100 10 1. With 2 equal resistances, it makes sense that in the middle you will have 2.5V. 4.6 out of 5 stars 18. ( Log Out /  ( Log Out /  First, let’s look at a schematic: We connect the photo resistor to +5V (or +3.3V) on one end and the other end on a analog port (the ESP8266 has one, the Arduino has many). So I was very happy to find your post above and wanted to thank you for posting it. The code is simple, initialize five ports and continously display the results of the ports. Well, we need to understand (somewhat) Ohm’s law. Now you can go to the GL5528 datasheet and see. V = 5V which means I = 5V / 20KΩ = 0.25 mA. Thanks so much for doing this work and posting this. The GL series of photoresistors or light-dependent resistor (LDR) or photocell which is a light-controlled variable resistor. I did find the following information (the table is compiled from different sources): But how does that help in connecting these things? It turned out to be quite difficult to find out which resistor does what. The GL5506 has a significantly lower resistance for a given amount of light compared to the GL5516 AND, in dark conditions the resistance of the GL5516 is significantly higher in resistance (as you would expect). Well, I decided to connect these things, all at the same time and look at the readings. Be the first to review “5MM Photoresistor – GL5516” Cancel reply. Thanks for contributing an answer to Electrical Engineering Stack Exchange! There are no reviews yet. How to identify different LDR photoresistors that have been mixed together? Had no real need for that many but it’s very cheap if you buy them through AliExpress. What this means is that the sensors are great for detecting deltas in light even though getting a precise lux reading is not really feasible.

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