From 5757e93b57d58a64df202849397f03127763ee30 Mon Sep 17 00:00:00 2001
From: Siwat Sirichai <siwat@siwatinc.com>
Date: Fri, 13 Oct 2023 22:57:19 +0700
Subject: [PATCH] initial energy monitoring implementation

---
 src/espmega_iot_emon.cpp | 39 +++++++++++++++++++++++++++++++++++++++
 src/espmega_iot_emon.hpp | 18 ++++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 src/espmega_iot_emon.cpp
 create mode 100644 src/espmega_iot_emon.hpp

diff --git a/src/espmega_iot_emon.cpp b/src/espmega_iot_emon.cpp
new file mode 100644
index 0000000..2cb6054
--- /dev/null
+++ b/src/espmega_iot_emon.cpp
@@ -0,0 +1,39 @@
+#include "espmega_iot_emon.hpp"
+
+ESPMega_CT::ESPMega_CT(uint8_t analog_pin, float (*adc_to_watts)(uint16_t adc_value), uint32_t fram_address)
+{
+    this->analog_pin = analog_pin;
+    this->adc_to_watts = adc_to_watts;
+    this->fram_address = fram_address;
+}
+
+void ESPMega_CT::begin()
+{
+    this->last_conversion_timestamp = millis();
+    ESPMega_FRAM.read(fram_address, (uint8_t *)&this->energy, 16);
+    this->power = adc_to_watts(ESPMega_analogRead(this->analog_pin));
+}
+
+void ESPMega_CT::loop()
+{
+    this->energy += (millis() - this->last_conversion_timestamp) / 3600000 * this->power;
+    this->power = adc_to_watts(ESPMega_analogRead(this->analog_pin));
+    this->last_conversion_timestamp = millis();
+    ESPMega_FRAM.write(fram_address, (uint8_t *)&this->energy, 16);
+}
+
+void ESPMega_CT::reset_energy()
+{
+    this->energy = 0;
+    ESPMega_FRAM.write16(fram_address, 0);
+}
+
+long double ESPMega_CT::get_energy()
+{
+    return this->energy;
+}
+
+float ESPMega_CT::get_power()
+{
+    return this->power;
+}
\ No newline at end of file
diff --git a/src/espmega_iot_emon.hpp b/src/espmega_iot_emon.hpp
new file mode 100644
index 0000000..e4993b8
--- /dev/null
+++ b/src/espmega_iot_emon.hpp
@@ -0,0 +1,18 @@
+#pragma once
+#include <ESPMegaPRO.h>
+class ESPMega_CT {
+    public:
+        ESPMega_CT(uint8_t analog_pin,float(*adc_to_watts)(uint16_t adc_value), uint32_t fram_address);
+        void begin();
+        void loop();
+        float get_power();
+        long double get_energy();
+        void reset_energy();
+    private:
+        uint8_t analog_pin;
+        uint32_t fram_address;
+        unsigned long last_conversion_timestamp;
+        float power;
+        long double energy;
+        float (*adc_to_watts)(uint16_t adc_value);
+};
\ No newline at end of file