mirror of https://github.com/arendst/Tasmota.git
46 lines
2.7 KiB
Plaintext
46 lines
2.7 KiB
Plaintext
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// ---------------------------------------------------------------------------
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// This example shows how to use NewPing's ping_timer method which uses the Timer2 interrupt to get the
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// ping time. The advantage of using this method over the standard ping method is that it permits a more
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// event-driven sketch which allows you to appear to do two things at once. An example would be to ping
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// an ultrasonic sensor for a possible collision while at the same time navigating. This allows a
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// properly developed sketch to multitask. Be aware that because the ping_timer method uses Timer2,
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// other features or libraries that also use Timer2 would be effected. For example, the PWM function on
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// pins 3 & 11 on Arduino Uno (pins 9 and 11 on Arduino Mega) and the Tone library. Note, only the PWM
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// functionality of the pins is lost (as they use Timer2 to do PWM), the pins are still available to use.
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// NOTE: For Teensy/Leonardo (ATmega32U4) the library uses Timer4 instead of Timer2.
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// ---------------------------------------------------------------------------
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#include <NewPing.h>
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#define TRIGGER_PIN 12 // Arduino pin tied to trigger pin on ping sensor.
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#define ECHO_PIN 11 // Arduino pin tied to echo pin on ping sensor.
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#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
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NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.
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unsigned int pingSpeed = 50; // How frequently are we going to send out a ping (in milliseconds). 50ms would be 20 times a second.
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unsigned long pingTimer; // Holds the next ping time.
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void setup() {
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Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.
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pingTimer = millis(); // Start now.
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}
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void loop() {
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// Notice how there's no delays in this sketch to allow you to do other processing in-line while doing distance pings.
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if (millis() >= pingTimer) { // pingSpeed milliseconds since last ping, do another ping.
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pingTimer += pingSpeed; // Set the next ping time.
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sonar.ping_timer(echoCheck); // Send out the ping, calls "echoCheck" function every 24uS where you can check the ping status.
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}
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// Do other stuff here, really. Think of it as multi-tasking.
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}
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void echoCheck() { // Timer2 interrupt calls this function every 24uS where you can check the ping status.
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// Don't do anything here!
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if (sonar.check_timer()) { // This is how you check to see if the ping was received.
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// Here's where you can add code.
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Serial.print("Ping: ");
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Serial.print(sonar.ping_result / US_ROUNDTRIP_CM); // Ping returned, uS result in ping_result, convert to cm with US_ROUNDTRIP_CM.
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Serial.println("cm");
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}
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// Don't do anything here!
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}
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