5MM LDR Sensor Module Light Resistor Sensor Module Light Detection LM393 3 pins for Arduino (10PCS)

Product received as described.

Used for an emoji planter and seems to detect light well. Been in constant use for over two months and still going strong.

The component is actually a neat little device. I had to return them since they operate opposite the way I was led to believe.There is an onboard power LED and an onboard DO LED. When power is applied the power LED illuminates. When the photoresistor is subjected to sufficient light the DO LED illuminates. At this point the DO output pin is 0. When light sources are hidden from the photoresistor the DO LED extinguishes and the DO output goes to Vcc voltage level - albeit at limited current availability but enough to barely light an external LED connected between DO and GND.I needed it to function opposite this.Correction:I played with it a little more and figured out that the device to be operated (in my case a small piezo buzzer) needed to have the negative terminal on DO and its source (+) on Vcc. DO acted like "ground" or "negative pole" switch. When connected in this fashion, it operated the way I had intended. Trouble is the buzzer output volume/loudness was significantly diminished - but it worked like a charm. Not sure if that is how it is supposed to be connected but it worked well.I changed my rating to 4 stars because I did manage to get it to work.Power source (Vcc): Three LR-44 button cells in series producing 4.35VDC.Device operated: Active 5VDC Piezo buzzer drawing ~17mA at 4.35V.

Unlike other devices (sensors) that are configured with this controller, I sometimes remove the light sensor and put other variable resistive devices and get the advantages of using the same chip device. These are cheaper than creating my own and give me all the leads to fully utilize any variable resistive load.

This is not an analog sensor designed to provide a 0-5v variable analog signal. If you want a sensor with "bandwidth" purchase a stand alone photo receptor and measure the output. This "module" has the logic built in to measure the light intensity against the threshold set on the potentiometer and provide a digital 5v or 0V depending if the light intensity is above or below the threshold. The output is is high or low, not variable. It says this in the description and it would be clear to anyone looking at the schematic provided in the images. Product does not deserve the poor ratings because it was purchased for a purpose other than it was designed.

These did not serve my purpose. Connected the D0 pin of the sensor to my Analog 0 Arduino pin. It behaved almost digitally. Going from off to on within too small a range to be useful. The adjustment pot just raised the threshold "on" value but did not have an effect on what i would call bandwidth. So i just ordered a bunch of raw light sensors to get the widest possible bandwidth and rightfully so.

I got these thinking they measure lux and I could determine brightness of a room. I am not giving them lower rating because they do what they are supposed to. These determine if there is light or not and you can adjust the sensitivity on the board. I was able to make them work for my scenario but if you are wanting the brightness of the room use a different sensor.

Has a huge tolerance. The time from detection to sending the signal to your micro controller is too long. I would recommend using a Hallmark magnet sensor