I bought an animal tag reader from Ali Express, but accidentally I chose the standard version without USB or Bluetooth communication. Does anyone have any knowledge, if (and how) I could communicate with device with MCU? The device has 4 pads that look like they could have some functionality, but I haven't yet figured out how to use them. From low to top, first seems to be VCC (3.3V), second one Ground, next one is connected to button (active LOW) and the last has some pulse that could possibly have something to do with data. Oscilloscope gives it's pulses frequency around 43,7kHz.
Yeah, know my soldering here is crappy but microscope does not show any shorts Sorry I'm new at this forum, so what do you mean by annotated schemantics? More detailed picture without wires and with those pads annotated? Unfortunately, those IC components have all prints removed to make my life more challenging.
Schematics are thelanguage of electronics,frizzes are a different local language.
What is a schematic What Is a Schematic Diagram? How to Read a Schematic - SparkFun Learn
HOW to READ a Schematic: https://www.youtube.com/watch?v=9cps7Q_IrX0&t=15s
You can get a great CAD (Computer Aided Design) software package called KiCad for free however they request a non required donation. This will do analog an digital schematic capture and all the steps to a PCB including the Gerber files. It is not a one night learning experience.
Ah, we might have some miscommunication here, sorry. I do know what schemantics is and have tried some software for fun earlier. But what I'm trying to do here is not to replicate the device, but just trying to figure out if there's a way to communicate with this device. Maybe I put my question under wrong section... although device hacking sounded right since I cannot communicate with it without opening the case and capturing some internal signal.
Sorry I'm new at this forum, so what do you mean by annotated schemantics? More detailed picture without wires and with those pads annotated? Unfortunately, those IC components have all prints removed to make my life more challenging.