convert time between triggers to voltage clock

Converting Time Between Triggers to Voltage Clock

In many applications, it is essential to measure the RPM of a motor accurately. One common method involves using triggers or sensors to detect the rotation of the motor and convert the signals into a voltage clock signal that can be easily measured by an Arduino board.

The presented scenario involves two sensors spaced 35° apart on the flywheel, which generate two separate voltage drops when the magnet passes each sensor. The first sensor creates a voltage drop when the magnet passes it, while the second sensor creates a voltage drop when the magnet passes it again. This results in two distinct signals that can be used to calculate the RPM of the motor.

The Arduino board can be programmed using the Input Capture feature to measure the time interval between these two triggers. The code will need to capture the rising edge of each trigger signal and calculate the time difference between them. This information can then be used to calculate the RPM of the motor in revolutions per minute.

Here's an example script that demonstrates how to achieve this:

```cpp

const int trigPin1 = 9; // Pin for the first trigger sensor

const int trigPin2 = 10; // Pin for the second trigger sensor

volatile uint32_t firstRisingEdgeTime = 0;

volatile uint32_t secondRisingEdgeTime = 0;

void setup() {

pinMode(trigPin1, INPUT);

pinMode(trigPin2, INPUT);

TIMSK1 |= _BV(TOIE1); // Enable Timer 1 Overflow Interrupt

TIMSK1 |= _BV(ICIE1); // Enable Timer 1 Input Capture Interrupt

TCCR1B = _BV(CS10); // Start Timer 1 with no prescaler

}

void loop() {

// Wait for the first trigger signal to be detected

while (digitalRead(trigPin1) == LOW);

// Clear the overflow flag

TIFR1 |= _BV(TOV1);

// Set the starting time of the first trigger signal

firstRisingEdgeTime = micros();

// Wait for the second trigger signal to be detected

while (digitalRead(trigPin2) == LOW);

// Clear the overflow flag again

TIFR1 |= _BV(TOV1);

// Set the starting time of the second trigger signal

secondRisingEdgeTime = micros();

// Calculate the RPM using the time difference between the two triggers

uint32_t rpm = (1000000 / ((secondRisingEdgeTime - firstRisingEdgeTime) * 2));

Serial.print('RPM: ');

Serial.println(rpm);

}

```

In this script, the Arduino board captures the rising edges of each trigger signal using the Input Capture feature of Timer 1. The code then calculates the time difference between these two triggers and uses it to calculate the RPM of the motor.

This script is a basic example that demonstrates how to measure the RPM of a motor using an Arduino board and two trigger sensors. However, in practice, you may need to adjust the script according to your specific application requirements and sensor configurations.

Convert time between triggers to voltage clock