Anyone have documents about this laser sensor DS18B20 please let me know. I searched on google and found the temperature sensor of the same name.
Currently it is quite sensitive to sunlight. I want to reduce the sensitivity by adding a rheostat to the circuit, but I don't know how it works.
That's a temperature sensor, no?
You haven't posted a circuit.
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The DS18B20 is a laser sensor of the same name as another temperature sensor. I don't understand how this sensor works, so I don't know how to add a rheostat to the circuit.
The DS18B20 is a laser sensor of the same name as another temperature sensor. I don't understand how this sensor works, so I don't know how to add a rheostat.
Hi,
this "laser" sensor of yours is a module that somehow was taken advantage of a module for DS18B20. (this is common on china sales sites).
The photosensor that receives the laser light is an ISO203.
See its "datasheet" and the pinout.
It is a sensor with an integrated amplifier.
PS:
Schematic of module:
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Which is not uncommon for a light sensor 
Is that sensor suitable for your project.
What is your project.
Leo..
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I believe you mistyped something in your search. The DS18B20 shows only temperature sensors. Please post a schematic as you have it wired, including what micro and a link to technical information on your sensor.
Actually post #5 does an excellent job of explaining everything. Yes, the boards are clearly labeled DS18B20 exactly as shown in post #1. The board is laid out exactly as shown in post #5. A Google of "iso203 laser receiver datasheet" will bring up all sorts of data.
A word to the wise:
Note how the sensor pinout mates with the board. If you receive sensor and board apart make sure the sensor is mounted correctly.
Theses also can be had with 5.0 Volt 5.0 mW LASERs (Diode LASERS) Make sure rather than run the LASER emitter on 5.0 volts it's wise to include about a 47 Ohm series resistor. In a room with average 3500 Kelvin warm white light no problem. Outside in daylight around 5500 Kelvin you want to shield the sensor using maybe 1/2 inch cutoff drinking straw with black tape around it just to shield ambient bright daylight. Overall they work pretty good. Again great drawings and clarification in Post #5.I have used them on a target 20 feet and they do just fine.
They work well with these LASER Emitters.
Ron
Maybe the boards are dual purpose.
What markings are on the sensor?
None as in zero, zip, nada. Directly above the sensor socket the board is clearly labeled DS18B20 and really other than a few 10K resistors and a cap and LED there is nothing to it. The question of the board markings of DS18B20 and the fact that it is not a temperature sensor comes up every now and then. The sensor itself has no markings.
Ron
You might need a pipe/tube to block light that's off-axis. And maybe some lenses to focus on the laser. An optical filter can help too, to block/reduce everything except the laser's wavelength.
Thinking more about this you may be into something. Take a look at this;
Now take a look at a DS18B20 pinout:
Normally a DS18B20 temperature sensor uses a 4.7K pullup but a 10K should work fine. Both sensors have the same pinout. Actually a DS18B20 temperature sensor could be plugged into this board as easily as the ISO203. Best guess is these boards may have been intended for a DS18B20 but were used for the ISO203 sensors. I could easily replace the ISO203 with a DS18B20 and it should work fine. Pure speculation on my part but would explain the markings on so many of these boards from China.
Ron
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