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// Target : ATMEGA16
// Crystal: 8.0000Mhz
//key.h
#ifndef _4X4_H_
#define _4X4_H_
#define No_key 255
#define key_port PORTB
#define key_port_ddr DDRB
#define key_port_pin PINB ...[Details]
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RFID
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1. First, the PWM output type of the receiver is introduced. By measuring with an oscilloscope, we can know: 1. The output of Walkera 1002 receiver is PWM wave, each channel cycle is 22ms, high lev...[Details]