thermal printer head detection mainly includes: paper detection, print head temperature detection and pressure bar detection. Temperature detection and paper detection are analog signals, you need to receive abc converted to digital values later to determine. The only need to receive the pressure bar detection ordinary io port or external interrupt can be.
1, paper detection
Main to determine the status of the paper, including: out of paper, black and normal. Generally best with the pressure bar detection together to determine.
2, the pressure bar detection
Used to determine whether the Printer Mechanism pressure bar pop, you can detect whether the paper warehouse is open.
3, temperature detection
Detection of the temperature of the thermal printer head heating point, the need for temperature overheating in the process of printing to achieve the suspension of print head protection.
The pressure bar and temperature detection are very simple, it should be noted that the temperature detection and paper detection, the divider resistor should be used 1% precision precision resistors.
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