Help detecting smd parts

Hi,

I have a humidity sensor gy21. After informational reading about the sensor itself, I’ve noticed “solutions” with the same sensor. There are various “wiring” options for the sensor.

I have the one that has some SMD parts I do not know how to search in order to know what are they for.

662K is voltage regulator. But what are the other two?

8 pin: 103
6 pin: 702

Is there any general rule how to decipher smd components markings other than capacitors or resistors?

That is about the ugliest SMD board build I have seen.

Looks the same as the EBAY offering EBAY board

There is a schematic on the EBAY page.

Paul

can you in short say why is it ugly?

I do not know if it is ugly or not. = )

And still I could not actually find the parts.

Just figured they are voltage regulators.

markotitel:
can you in short say why is it ugly?

I do not know if it is ugly or not. = )

Sure! Crooked parts, made with wire solder instead of solder paste. Most pins have too much solder. Solder is lumpy, not smooth.

IF you made it yourself, for your use, and it works, then go for it. But look at the similar device pictures on Ebay.

Paul

markotitel:
And still I could not actually find the parts.

Just figured they are voltage regulators.

Did you actually look at the EBAY schematic???? They are listed right there!!!!!

Paul

Yes I did look at the parts.

N_MOS
3.3V LDO

Besides the SHT21 sensor.

One more part is missing. there are three smd parts besides one resistor and three capacitors.

thank you Ted.

Can you share the search words in order to find this?

How would one search for such parts in general?

Start with SMD and add something.
Resistor, resistor array .....
example - type that on google images - SMD P1, SMD 702 .....

or
smd code

Hi,
ebay schematic.
30463-4.jpg
Tom… :slight_smile:

The 662K voltage regulator is a LM6206N3 (Cystech) but the logo on yours is Microne.

The 702 dual MOSFET is comparable with 2N7002DW