From: rtrimana <rtrimana@uci.edu>
Date: Mon, 16 Apr 2018 16:09:07 +0000 (-0700)
Subject: Powering up sensor using an I/O pin to turn it off when PHOTON goes into deep sleep.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=8a8d3e2306c65c48a575bacefe511b63ff365191;p=iotcloud.git

Powering up sensor using an I/O pin to turn it off when PHOTON goes into deep sleep.
---

diff --git a/version2/src/C/Sensor-Arduino.ino b/version2/src/C/Sensor-Arduino.ino
index 48614b2..214447e 100644
--- a/version2/src/C/Sensor-Arduino.ino
+++ b/version2/src/C/Sensor-Arduino.ino
@@ -6,10 +6,11 @@
 
 // System defines
 // Arduino
-#define DHTPIN			2		// what pin we're connected to
+#define DHTPIN			2		// Data pin
+#define PWRPIN			D5		// Power pin
 #define DHTTYPE 		DHT22	// DHT 22  (AM2302)
 // IoTCloud
-#define SLEEP_TIME		1800	// Sleep time in seconds
+#define SLEEP_TIME		10		// Sleep time in seconds
 
 // Initialize DHT sensor for normal 16mhz Arduino
 DHT dht(DHTPIN, DHTTYPE);
@@ -33,6 +34,13 @@ void setup() {
 	// firmware onto the Particle board.
 	// e.g. sudo screen /dev/ttyACM0
 
+	// We use one I/O pin to power the sensor so
+	// that we can make it go to sleep when we go into
+	// deep sleep.
+	pinMode(PWRPIN, OUTPUT);
+	// Turn on sensor
+	digitalWrite(PWRPIN, HIGH);
+
 	// Prepare device key from MAC (just last 2 of 6 digits)
 	byte mac[6];
 	WiFi.macAddress(mac);
@@ -86,6 +94,9 @@ void loop() {
 
 	iKeyA->releaseRef();
 	iValueA->releaseRef();
+	
+	// Turn off sensor
+	digitalWrite(PWRPIN, LOW);
 	System.sleep(SLEEP_MODE_DEEP, SLEEP_TIME);
 }