This is a microprocessor controlled toy with 51 keyboard, use a timer 51 and keyboard technology, which follows the assembly process flow, making it suitable for beginners to learn. Note: P1.0 port by the MCU output audio signal, the P1.0 port access transistor to drive the speakers, the best form with two Darlington transistor structure. P2 port connector at one end grounded keys 8 as input, of course, need to connect 8 10K resistor to the power supply as the pull-up resistor. P2.0 ~ P2.7 were Do, Re, Mi, Fa, So, La, Si, Do (high) tone.

key progamme - 副本.txt
key progamme - 副本 (2).txt
key progamme - 副本 (3).txt
key progamme.txt

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