我想将时间从我的电脑同步到 arduino。我正在使用他们的时间库,但它不起作用。
如何让 arduino 与我的计算机上的时间相同?我目前正在使用mac。
他们的文件说:
在 unix 系统上,您可以使用 shell 命令设置时间:
TZ_adjust=-8; echo T$(($(date +%s)+6060$TZ_adjust)) > /dev/tty.usbserial-A8008pym
我在终端上试过
>export TZ_adjust=-8; echo T$(($(date +%s)+6060$TZ_adjust)) > /dev/tty.usbmodemfd131
我得到许可被拒绝。
我究竟做错了什么?有没有更简单的方法可以将 arduino 上的时间与我的电脑同步?
编码
#include <Time.h>
#define TIME_MSG_LEN 11 // time sync to PC is HEADER followed by unix time_t as ten ascii digits
#define TIME_HEADER 'T' // Header tag for serial time sync message
#define TIME_REQUEST 7 // ASCII bell character requests a time sync message
void setup() {
Serial.begin(9600);
setSyncProvider( requestSync); //set function to call when sync required
Serial.println("Waiting for sync message");
}
void loop(){
if(Serial.available() )
{
processSyncMessage();
}
if(timeStatus()!= timeNotSet)
{
digitalWrite(13,timeStatus() == timeSet); // on if synced, off if needs refresh
digitalClockDisplay();
}
delay(1000);
}
void digitalClockDisplay(){
// digital clock display of the time
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
Serial.println();
}
void printDigits(int digits){
// utility function for digital clock display: prints preceding colon and leading 0
Serial.print(":");
if(digits < 10)
Serial.print('0');
Serial.print(digits);
}
void processSyncMessage() {
// if time sync available from serial port, update time and return true
while(Serial.available() >= TIME_MSG_LEN ){ // time message consists of a header and ten ascii digits
char c = Serial.read() ;
Serial.print(c);
if( c == TIME_HEADER ) {
time_t pctime = 0;
for(int i=0; i < TIME_MSG_LEN -1; i++){
c = Serial.read();
if( c >= '0' && c <= '9'){
pctime = (10 * pctime) + (c - '0') ; // convert digits to a number
}
}
setTime(pctime); // Sync Arduino clock to the time received on the serial port
}
}
}
time_t requestSync()
{
Serial.print(TIME_REQUEST,BYTE);
return 0; // the time will be sent later in response to serial mesg
}