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Author: NanaVan

trigger/TestSampleRate/TestSampleRate.ino

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+//////
+// speed up sampling rate -- by [email]tsaiwn@cs.nctu.edu.tw[/email]
+const int pin = A0;
+const int n = 1000; // sample 採樣 1000 次
+void setup() {
+ Serial.begin(230400);
+ //setP32( ); // Prescaler = 32
+ //setP8( ); // Prescaler = 8
+ //setP16( ); // Prescaler = 16
+ //setP128( ); // Prescaler = 128 = default
+ setP4();
+ for(int i=0; i< 543; i++) analogRead(A0); 
+ Serial.println(String("Sample ") + n + " times, pin=" + pin);
+ Serial.flush( );
+ delay(568);
+}
+void loop( ) { // 
+ long begt, runt, total;
+ total = 0; // clear before sampling
+ begt = micros();
+ for(int i=0; i< n; i++) {
+ total += analogRead(pin);
+ }
+ runt = micros() - begt; // elapsed time
+ Serial.println(String("Average=") + total/n);
+ Serial.print(String("Time per sample: ")+runt/1.0/n +"us");
+ Serial.println(String(", Frequency: ")+1000000.0/runt*n +" Hz");
+ delay(5566);
+}// loop(
+void setP32( ) {
+ Serial.println("ADC Prescaler = 32"); // 101
+ ADCSRA |= (1 << ADPS2); // 1
+ ADCSRA &= ~(1 << ADPS1); // 0
+ ADCSRA |= (1 << ADPS0); // 1
+}
+void setP16( ) {
+ Serial.println("ADC Prescaler = 16"); // 100
+ ADCSRA |= (1 << ADPS2); // 1
+ ADCSRA &= ~(1 << ADPS1); // 0
+ ADCSRA &= ~(1 << ADPS0); // 0
+}
+void setP8( ) { // prescaler = 8
+ Serial.println("ADC Prescaler = 8"); // 011
+ ADCSRA &= ~(1 << ADPS2); // 0
+ ADCSRA |= (1 << ADPS1); // 1
+ ADCSRA |= (1 << ADPS0); // 1
+}
+void setP4( ) { // prescaler = 4
+ Serial.println("ADC Prescaler = 4"); // 010
+ ADCSRA &= ~(1 << ADPS2); // 0
+ ADCSRA |= (1 << ADPS1); // 1
+ ADCSRA &= ~(1 << ADPS0); // 0
+}
+void setP128( ) { // default
+ Serial.println("ADC Prescaler = 128"); // 111
+ ADCSRA |= (1 << ADPS2); // 1
+ ADCSRA |= (1 << ADPS1); // 1
+ ADCSRA |= (1 << ADPS0); // 1
+} // setP128

trigger/remote_trigger.py

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+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+from datetime import datetime
+import subprocess
+
+while True:
+# continually listen on port 5025, if connection is broken, reconnect immediately
+ with subprocess.Popen(["nc", "-l", "5025"], stdout=subprocess.PIPE) as netcat:
+ print("YUN: Waiting for trigger...")
+ message = netcat.stdout.readline().strip().decode("utf-8")
+
+ if (message == "triggered"):
+ print("YUN: Triggered! " + str(datetime.now()))
+

trigger/trigger1.0/trigger1.0.ino

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+#include <Bridge.h>
+#include <Process.h>
+
+
+void setup() {
+ // Bridge startup
+ pinMode(13, OUTPUT);
+ digitalWrite(13, LOW);
+ Bridge.begin();
+ digitalWrite(13, HIGH);
+ Serial.begin(9600);
+
+ delay(1000);
+ digitalWrite(13, LOW);
+
+ setP2();
+}
+
+
+void loop() {
+ int value = analogRead(A0);
+ float voltage = value * 0.00568;
+
+ Serial.println(voltage);
+
+ if (voltage < 0.5) {
+ Process p; // Create a process "p"
+ p.runShellCommandAsynchronously("nc 10.10.91.91 5025"); //10.10.1.62
+ p.println("triggered");
+ 
+ digitalWrite(13, HIGH);
+
+ delay(20); //ms
+ p.close();
+ digitalWrite(13, LOW);
+ }
+}
+
+
+void setP2( ) {
+ // ADC prescaler = 2
+ ADCSRA &= ~(1 << ADPS2); // 0
+ ADCSRA &= ~(1 << ADPS1); // 0
+ ADCSRA |= (1 << ADPS0); // 1
+}

trigger/trigger2.0/trigger2.0.ino

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+#include <Bridge.h>
+#include <Process.h>
+
+volatile boolean triggered = false;
+
+ISR(ANALOG_COMP_vect) {
+ triggered = true;
+}
+
+void setup() {
+ // Bridge startup
+ pinMode(13, OUTPUT);
+ digitalWrite(13, LOW);
+ Bridge.begin();
+ digitalWrite(13, HIGH);
+ 
+ Serial.begin(115200);
+ Serial.println("Started.");
+ //ADCSRB = 0;
+ //ACSR = bit (ACI) | bit (ACIE) | bit (ACIS1);
+ ACSR |= ((1<<ACBG)| // AIN+ set to bandgap reference voltage 1.1(1)V
+ (1<< ACI)|
+ (1<<ACIE)| // Analog comparator interrupt is activated
+ (1<<ACIS1)); // Comparator interrupt on falling output edge 
+ ADCSRB |= (1<<ACME); // AIN- set to ADC7
+ ADCSRA &= ~(1<<ADEN);
+ ADMUX |= ((1<<MUX2)|(1<<MUX1)|(1<<MUX0));
+
+ delay(1000);
+ digitalWrite(13, LOW);
+}
+
+void loop() {
+ if(triggered) {
+ Process p; // Create a process "p"
+ p.runShellCommandAsynchronously("nc 10.10.91.91 5025"); //10.10.1.62
+ p.println("triggered");
+ Serial.println("Triggered!");
+ triggered = false;
+
+ digitalWrite(13, HIGH);
+ delay(20);
+ p.close();
+ digitalWrite(13, LOW);
+ }
+}