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Symbol _ has the same meaning in functions/variable names as for example alphabet symbols. In your case it is just a part of function name. Its specific meaning in your program depends on programmer' mind who wrote this functions, nothing more.
lcd for reading
The simplest way would be to use touchscreen controller IC. There are many available on market, for example from Texas instruments. They will provide outside simple SPI protocol with XY positions.
You can give a look at this milling machine:
**broken link removed**
It is pretty cheap, easy programmable and can be used to make simple plastic covers.
mifare antenna
Need consultation of someone who has experience with designing power amplifier for any of NXP (Philips) reader ICs, like MFRC 522, 632, etc. Need to increase reading range from standard 10 cm to about 20-25 cm. Please, contact me by PM. The reward is guaranteed :D
Are you sure that you need PASSIVE RFID? Because it is difficult to imagine for me how it can be useful for sensor input without internal battery. Maybe, you need ACTIVE RFID?
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