watch_demo.tc

Watch Variables Demo

Source on GitHub

// Watch Variables Demo
// Demonstrates change detection for IOT monitoring
// watch keyword tracks variable changes automatically

watch float power;
watch int relay;
int cycle;

void EverySecond() {
    cycle++;

    // Simulate sensor reading changing every 3 seconds
    if (cycle % 3 == 0) {
        power = (float)(cycle * 10);
    }

    // Simulate relay toggle every 5 seconds
    if (cycle % 5 == 0) {
        if (relay) { relay = 0; } else { relay = 1; }
    }

    // Check for power changes
    if (changed(power)) {
        float diff = delta(power);
        print(power);
        print(diff);
        snapshot(power);
    }

    // Check for relay changes
    if (written(relay)) {
        print(relay);
        snapshot(relay);
    }
}

int main() {
    power = 0.0;
    relay = 0;
    cycle = 0;
    snapshot(power);
    snapshot(relay);
    return 0;
}