alarm function

Firmware/src/main.cpp

@@ -31,6 +31,7 @@
 #include <Arduino.h>
 #include <avr/sleep.h>
 #include <avr/wdt.h>
+#include <avr/interrupt.h>
 #include <tinySPI.h>
 
 
@@ -67,6 +68,10 @@
   SHT21 sensor;
 #endif
 
+#ifdef HAS_ALARM
+  volatile boolean alarm = false;
+#endif
+
 // Global Variable to Track Deep Sleep
 uint16_t sleep_interval;
 
@@ -127,6 +132,12 @@ void sleep(uint16_t s)
   s = s/8;
   sleep_interval = 0;
   while (sleep_interval < s) {
+  // in case of alarm, break loop and transmit immediatly
+  #ifdef HAS_ALARM
+    if( alarm == true){
+      return;
+    }
+  #endif
     set_sleep_mode(SLEEP_MODE_PWR_DOWN);
     sleep_mode();
   }
@@ -143,6 +154,16 @@ ISR(WATCHDOG_vect) {
   WDTCSR = (1<<WDIE)|(1<<WDP3)|(1<<WDP0);
 }
 
+#ifdef HAS_ALARM
+// innterrupt handler pin change
+ISR(PCINT0_vect)
+{
+  sleep_disable();
+  blink(1);
+  alarm = true;
+}
+
+#endif
 // Get Battery Voltage
 int32_t readVcc() {
   bitClear(PRR, PRADC);
@@ -221,6 +242,14 @@ void setup()
     radio.setPowerLevel(RFM69_TXPOWER);
     radio.sleep();
   #endif
+
+  #ifdef HAS_ALARM  
+    MCUCR  = (MCUCR & ~(bit(ISC01)|bit(ISC00))) | bit(ISC01);  // fallende Flanke 
+    GIMSK = (1<<PCIE0);
+    PCMSK0 = (1<<PCINT0);   // PCINT(PA0) 
+    pinMode(ALARM_PIN, INPUT_PULLUP);
+  #endif
+  
   // Setup LED if defined
   #ifdef LED_PIN
     pinMode(LED_PIN, OUTPUT);
@@ -228,7 +257,6 @@ void setup()
   #endif
 }
 
-
 void loop()
 {
   // Create Data Structure for Sensor Data
@@ -236,6 +264,11 @@ void loop()
     struct lora_data {
       uint8_t bat;
     } __attribute__ ((packed)) data; 
+  #elif defined HAS_ALARM
+      struct lora_data {
+      uint8_t bat;
+      uint8_t alarm;
+    } __attribute__ ((packed)) data; 
   #elif defined HAS_SHT21
     struct lora_data {
       uint8_t bat;
@@ -280,6 +313,11 @@ void loop()
     data.brightness = (int16_t)(brightness());
   #endif
 
+  #if defined HAS_ALARM
+    data.alarm = (uint8_t)alarm;
+    alarm = false;
+  #endif
+
   // Add Battery Voltage, 20mv steps, encoded into 1 Byte
   uint32_t batv = readVcc();
   data.bat = (uint8_t)(batv/20);

Firmware/src/secconfig.h

@@ -11,6 +11,7 @@
      #define HAS_BME280 - Bosch BME280 Temperature + Humidity + Pressure Sensor
      #define HAS_SHT21_BRIGHTNESS  - SHT21 + Brightness via LED
      #define HAS_BME280_BRIGHTNESS - BME280 + Brightness via LED
+     #define HAS_ALARM - send message when pin is triggered
 
    * LED Support
      #define LED_PIN PIN_A7 - LED is connected to ATTiny84 Pin A7 on TinyTX SMD / TinyLora
@@ -20,6 +21,10 @@
      #define LED_K PIN_A7 - LED Cathode
      #define LED_A PIN_B2 - LED Anode
 
+   * Alarm
+     #define ALARM_PIN PIN_A0
+     if pin changed , change also PCMSK0 = (1<<PCINT0); to corrent PCINT
+
    * Time between Measurements
      #define SLEEP_TIME 528 - Time in Seconds between Measurements. Try it out to get a good Approximation
      Examples from my Tests::
@@ -57,5 +62,14 @@
   #define HAS_BME280_BRIGHTNESS
   #define LED_K PIN_A7
   #define LED_A PIN_B2
-  #define SLEEP_TIME 544 // ca
+  #define SLEEP_TIME 544
   */
+
+/*
+// LoRa RFM95 + Alarm
+  #define RF_LORA
+  #define HAS_ALARM
+  #define ALARM_PIN PIN_A0
+  #define LED_PIN PIN_A7
+  #define SLEEP_TIME 544 
+  */