I have a component (which I believe to be an Ultrasonic sensor) but I have no way of determining which brand/model it is exactly.
Any help would be greatly appreciated:
here are some pictures
If you mean the red board, that looks like a BSS138 logic level converter.
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Thanks this is very helpful.
The Ultrasonic sensor that I'm trying to identify is plugged into it to (I'm assuming) convert data for processing by the board.
Now, the green board (and associated, little grey buzzer-like thing) is the last mystery.
Looks like some type of gas or smoke detector.
you use such a voltage adapter when one side use different signals levels - say 5V and the other side 3.3V . You would find that typically in I2C
With a question like this, it helps if you give as much information as possible.
Where did you get this device, what was it being used for, do you have the case or other components that can be used to identify it, etc?
Also good to have clear photos of any part numbers, logos, or printing on the circuit boards.
There might be more identifying information if you remove what looks like electrical tape around the device.
Hi, @thecois
Can you move some of the wires away from the green PCB, so we can get a better look at it?
Can you post images of the ultrasonic unit and its connections to the PCB?
Thanks.. Tom.. 
Hi @TomGeorge ,
Here's a new attempt at taking pictures (the wires on the green PCB are soldered quite tightly and I couldn't move them much more than you are seeing now).
what's the exact ESP ?
@J-M-L , it's an ESP32
do you know which one exactly ? (ie is it a off the the shelf brand ?) that would help identify the pins used to connect to the voltage adapter.
It's a customized ESP32 ( the actual product is here: T-A7670E/G/SA R2 – LILYGO®)
The pins connected are:
22,21,23,19 : the orange wires
VBus: yellow wire
GND: blue wire
seems SPI and I2C are used then.
The ESP32 is 3.3V, so possibly the other equipment is 5V
no branding or any information on the green board?
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I couldn't see any branding.
The board was put together and sent to me by its original builder (whom I can't get in touch with).
But knowing SPI and I2C are used is a big help in using this ultrasonic sensor.
Could you post a clear, in focus, picture of both side of the green board and the sensor?
That looks i2c. Have you run the i2c_scanner sketch?Maybe its address will help.
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Someone built and sent this to you, and you have no idea what it is or what it is suppose to do????
On the green board I see footprints for elements where there are no elements themselves. In particular, a large seat like TQFP48 format for a microcontroller. That is, the board is most likely not being used for what it was designed for and the markings on it may have nothing to do with its current use
Definitely. Note also the crystal oscillator.
I suspect it was supposed to be an integrated sensor solution with an onboard controller to process the acquired data, but that this implementation ended up not meeting expectations. As a workaround, the sensor frontend and power supply is still used, but the data are fed into a separate controller board. Maybe it has something to do with the ESP32 offering connectivity like WiFi and BLE. Or maybe there was just a design flaw in the board that made it unusable.
Most likely this is a homemade board that does not have any model or brand. You hardly will find a diagram for it or any description on the Internet.
In order to understand how to work with it, you either need to ask the person who sent it to you, or do your own research, draw a diagram of the board and work out the assignment of elements and connections yourself.
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