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I was cleaning my new office and found out that the previous employee left some modules undocumented (GPS, GSM and others). However, I found one module that I couldn't identify, so I'm asking for your help.

front module view

This picture shows the front view of the module.

The pins are marked as: NC, SCL, SDA, VCC, GND.

It also has two things that look like speakers and some LDR at the top, with a LED marked as STA.

From that I'm guessing it should be some kind of ultrasonic module via I2C or a LiDAR.

At the bottom it says: (c) 2012.

back module view

At the back I can find some ICs and other components.

The one at the left has a marking saying: MAX3232 CSE + 1225.

The middle one has a marking that says: PIC16F690 -I/SS 1221R8W.

The one at the right is marked with: 36AD LMC60 32IM.

I'm hoping that information is enough to know what this module is and how to correctly interface it (maybe some datasheet or I2C registers documentation would be nice).

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    \$\begingroup\$ Looks like an ultrasonic sensor although theres a photoresistor in the middle... So could be some type of combo detector for motion or distance. What happens when you put 5V between VCC and GND \$\endgroup\$ Commented May 16 at 1:25
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    \$\begingroup\$ I've tried searching using images but to no avail. I'd guess it's a variant of the popular HC-SR04 ultrasonic range module. But that has a crystal where the LDR is on yours. From the possible date code (13 years old) it could be a predecessor design with the LDR adding day / night sensing for use in security lights and similar. \$\endgroup\$ Commented May 16 at 1:48
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    \$\begingroup\$ Weird that they hand soldered everything when this is a commercial module. \$\endgroup\$ Commented May 16 at 7:00
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    \$\begingroup\$ @Lundin at least in Germany and especially some years ago it wasn't that uncommon that the products could be had either completely assembled or at a lower price as a DIY kit with just the PCB and components in a bag to solder for yourself. \$\endgroup\$ Commented May 16 at 12:59

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The module is a variant of the KS103 module. It has an ultrasonic transmitter and receiver to measure distances, a photoresistor to measure light intensity and a temperature sensor.

enter image description here

(Source: dauxi.com)

The one in your picture seems to be called KCS103 and is claimed to be compatible with the KS103 and KS101B by this listing.

enter image description here

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