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130 lines
3.0 KiB
130 lines
3.0 KiB
#include <Arduino.h>
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#include <avr/sleep.h>
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#include <Wire.h>
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#include <RtcDS3231.h>
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#include <HX711.h>
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RtcDS3231<TwoWire> Rtc(Wire);
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HX711 scale;
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const int rtcPowerPin = 4;
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const int wakeUpPin = 7;
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const int ledPin = 17;
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const int scaleDataPin = 21;
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const int scaleSckPin = 20;
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const int scalePowerPin = 19;
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const int secondsTillNextWakeup = 3;
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const long interval = 50;
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void wake()
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{
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sleep_disable();
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detachInterrupt(digitalPinToInterrupt(wakeUpPin));
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}
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void sleepNow()
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{
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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noInterrupts();
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sleep_enable();
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attachInterrupt(digitalPinToInterrupt(wakeUpPin), wake, LOW);
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interrupts();
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sleep_cpu();
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}
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void setup()
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{
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delay(3000);
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Serial.begin(9660);
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Serial.println("Initializing.");
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pinMode(wakeUpPin, INPUT_PULLUP);
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pinMode(ledPin, OUTPUT);
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pinMode(scalePowerPin, OUTPUT);
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pinMode(rtcPowerPin, OUTPUT);
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digitalWrite(rtcPowerPin, HIGH);
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digitalWrite(scalePowerPin, HIGH);
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Rtc.Begin();
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scale.begin(scaleDataPin, scaleSckPin);
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scale.set_scale(1000.f); // this value is obtained by calibrating the scale with known weights; see the README for details
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scale.tare(); // reset the scale to 0
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RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
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if (!Rtc.IsDateTimeValid())
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{
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if (Rtc.LastError() != 0)
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{
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// we have a communications error
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// see https://www.arduino.cc/en/Reference/WireEndTransmission for
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// what the number means
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Serial.print("RTC communications error = ");
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Serial.println(Rtc.LastError());
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}
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else
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{
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Serial.println("RTC lost confidence in the DateTime!");
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Rtc.SetDateTime(compiled);
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}
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}
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if (!Rtc.GetIsRunning())
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{
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Serial.println("RTC was not actively running, starting now");
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Rtc.SetIsRunning(true);
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}
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RtcDateTime now = Rtc.GetDateTime();
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if (now < compiled)
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{
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Serial.println("RTC is older than compile time! (Updating DateTime)");
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Rtc.SetDateTime(compiled);
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}
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Rtc.Enable32kHzPin(false);
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Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeAlarmOne);
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}
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void loop()
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{
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pinMode(rtcPowerPin, OUTPUT);
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pinMode(scalePowerPin, OUTPUT);
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digitalWrite(scalePowerPin, HIGH);
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digitalWrite(rtcPowerPin, HIGH);
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digitalWrite(ledPin, LOW);
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delay(interval);
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scale.power_up();
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RtcDateTime now = Rtc.GetDateTime();
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RtcDateTime alarmTime = now + secondsTillNextWakeup;
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DS3231AlarmOne alarm1(
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alarmTime.Day(),
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alarmTime.Hour(),
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alarmTime.Minute(),
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alarmTime.Second(),
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DS3231AlarmOneControl_HoursMinutesSecondsMatch);
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Rtc.SetAlarmOne(alarm1);
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Rtc.LatchAlarmsTriggeredFlags();
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Serial.println(scale.get_units(1), 1);
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Serial.flush();
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scale.power_down();
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digitalWrite(scalePowerPin, LOW);
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digitalWrite(ledPin, HIGH);
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digitalWrite(rtcPowerPin, LOW);
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pinMode(rtcPowerPin, INPUT);
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pinMode(scalePowerPin, INPUT);
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sleepNow();
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}
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