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I am not sure PCB identification is on-topic for this site, please let me know if it isn't.

My wife found this PCB in her bag. She thought I had given it to her, but I do not recall that at all. Does anyone know what it could be from or for?

PCB top

PCB bottom

It is around 31 by 37 mm in size. On on side it has four pushbuttons and a small blue led, which blinks at different frequencies when different buttons are pushed. On the side it has what looks like a micro-USB connector.

On the other side it has two small IC's, one with 14 legs and H3-100 written on it, the other has ATMLH434, 16CM Y, 4W2601B, and a search brings up some shopping sites with little information, but there are IC's with the same first line that seem to be eeprom chips.

The PCB itself says 215BHS-1.

Does anyone have any idea what this could be? Thanks!

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    \$\begingroup\$ So that's where it is! No wonder I couldn't find it. \$\endgroup\$
    – Transistor
    Aug 24, 2020 at 22:22
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    \$\begingroup\$ Some sort of remote control. \$\endgroup\$
    – Finbarr
    Aug 24, 2020 at 22:26
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    \$\begingroup\$ Looks like the innerds of some form of controller like you might find in, say, lecture theatres to get audiences to vote (A/B/C/D etc.). \$\endgroup\$
    – Tom Carpenter
    Aug 24, 2020 at 22:27
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    \$\begingroup\$ Looks like a key fob of some sort. Perhaps a garage door opener? \$\endgroup\$
    – DerStrom8
    Aug 24, 2020 at 23:34
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    \$\begingroup\$ Ask your wife if she found two empty case halves in her bag and if her remote control for ??? is missing. \$\endgroup\$
    – Russell McMahon ♦
    Aug 25, 2020 at 5:27

3 Answers 3

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Note the relatively heavy trace along the right side of the second image, and the fact that there's no ground plane on the other side in that area. That's an antenna. Note also several spiral coils elsewhere on both sides of the board.

This is an RF remote control of some sort.

The 8-pin chip may well be a serial EEPROM of some sort. The larger chip is probably a custom ASIC, although there's some chance that it might be a relatively general-purpose MCU with RF hardware built-in.

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this is the circuit of a remote controller for garage doors or store doors. The remote control is a REMOCON model RMC225HS868. It works with an emission frequency of 868Mhz. The miniUSB port is used to be programmed through specific hardware of the same REMOCON brand. I sell them in my business. Best regards! enter image description here

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it looks like one of those RF key fobs to switch on a remote relay or something. The LED turns on when any of the buttons are pressed and the RF on the other side of the board sends the signal out. This is a Transmitter only. I think the long IC is the USB to TTL logic converter and the small 8 pin IC could be a microcontroller or as Dave mentioned, could be EEPROM, but for EEPROM to function correctly, it needs a microcontroller so my best guess would be that is a micro processor, like ATTINY variant or TST microelectronics.

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