From 678dfb7e93f1d613fb9a513d60a685d5e3c1c3b3 Mon Sep 17 00:00:00 2001
From: Trygve Laugstøl <trygvis@inamo.no>
Date: Sat, 18 Jul 2015 22:51:24 +0200
Subject: o First round of low power, going low power when sleeping.

---
 trygvisio_soil_moisture.ino | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/trygvisio_soil_moisture.ino b/trygvisio_soil_moisture.ino
index e524f71..8185754 100644
--- a/trygvisio_soil_moisture.ino
+++ b/trygvisio_soil_moisture.ino
@@ -1,8 +1,8 @@
+#include <LowPower.h>
 #include <EEPROM.h>
 #include <SPI.h>
 #include <lib_aci.h>
 #include <aci_setup.h>
-#include <avr/sleep.h>
 
 // See config.h on how to configure the sketch
 #include "config.h"
@@ -34,6 +34,16 @@ void __ble_assert(const char *file, uint16_t line)
   while(1);
 }
 
+#if defined(__AVR_ATmega32U4__)
+static void go_to_sleep() {
+  LowPower.idle(SLEEP_1S, ADC_OFF, TIMER4_OFF, TIMER3_OFF, TIMER1_OFF, TIMER0_OFF, SPI_OFF, USART1_OFF, TWI_OFF, USB_OFF);
+}
+#else
+#warning No sleep support for current CPU architecture.
+static void go_to_sleep() {
+}
+#endif
+
 void setup() {
 #if defined(BLEND_MICRO_8MHZ)
   // As the F_CPU = 8000000UL, the USB core make the PLLCSR = 0x02
@@ -96,7 +106,7 @@ static void setup_rf() {
   aci_state.aci_pins.active_pin             = UNUSED;
   aci_state.aci_pins.optional_chip_sel_pin  = UNUSED;
 
-  aci_state.aci_pins.interface_is_interrupt = false; //Interrupts still not available in Chipkit
+  aci_state.aci_pins.interface_is_interrupt = false;
   aci_state.aci_pins.interrupt_number       = 4;
 
   // We reset the nRF8001 here by toggling the RESET line connected to the nRF8001
@@ -341,6 +351,13 @@ void loop() {
   }
 
   sm_loop();
+
+#ifdef SM_DEBUG
+  Serial.println(F("Sleeping..."));
+  Serial.flush();
+#endif // SM_DEBUG
+
+  go_to_sleep();
 }
 
 static void show_pipes() {
-- 
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