Foreword
In this section we learn WeMos D1 using a timer, the timer may be implemented using timing delay control function, PWM output, and the count of the detection of external events.
First, the basics
1.WeMos D1 timer Introduction
WeMos D1 timer realized by Ticker, Ticker is a timer library, timer function can be easily achieved by Ticker. IO is not currently recommended to prevent operation (network, serial, file) Ticker from the callback function. It is preferably provided a callback flag in the code, and then check the flag in the round functions.
2. WeMos D1 timer Description Function
Second, examples
Examples proceeding two timers, a single timer is, 6 seconds after entering the timing of a single callback function, the other is a cyclic timing sequentially every 3 seconds into the callback function.
#include <Arduino.h>
#include <Ticker.h>
Ticker tk, tk1;
int timer_flag = 0;
int count = 0;
void timer_coming_once_cb(void)
{
Serial.println("time coming only once.");
tk1.detach();
}
void time_coming_cicyle_cb(void)
{
timer_flag = 1;
count++;
}
void setup() {
Serial.begin(9600);
tk1.once(6, timer_coming_once_cb);
// call time_coming_cicyle_cb every 3s
tk.attach(3, time_coming_cicyle_cb);
}
void loop() {
if (1 == timer_flag)
{
Serial.println("time coming......");
Serial.println(count);
timer_flag = 0;
if (10 == count)
{
Serial.println("stop timer");
tk.detach();
}
}
}The above-mentioned procedures, the use to attch (), detach (), once () function, use the same delay in milliseconds, but the timing of time becomes short.
Third, run
Click Upload, post-equipment operation Log are as follows:
From the figure, we can now have a normal operation of the timer.
IV Conclusion
1. Summary:
End of this section, the actual operation needs attention are the following:
(1) Definition timer
If multiple timing mode, the result should be more defined type variable Ticker, as shown in the use of a single timing and the timing cycle, but also defines two variables, and tk respectively tk1.
2. Postscript:
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