Constructor overload for better ESP32 support

+ example

Closes #20

Signed-off-by: Emil Muratov <gpm@hotplug.ru>

PZEM004Tv30.cpp

@@ -106,6 +106,25 @@ PZEM004Tv30::PZEM004Tv30(HardwareSerial* port, uint8_t addr)
     init(addr);
 }
 
+#ifdef ESP32
+/*!
+ * PZEM004Tv30::PZEM004Tv30
+ *
+ * Hardware serial constructor with custom pin mapping (esp32)
+ *
+ * @param port Hardware serial to use
+ * @param rxpin gpio pin to map rx
+ * @param txpin gpio pin to map tx
+ * @param addr Slave address of device
+ */
+PZEM004Tv30::PZEM004Tv30(HardwareSerial* port, uint8_t rxpin, uint8_t txpin, uint8_t addr){
+    port->begin(PZEM_BAUD_RATE, SERIAL_8N1, txpin, rxpin);
+    this->_serial = port;
+    this->_isSoft = false;
+    init(addr);
+}
+#endif
+
 /*!
  * PZEM004Tv30::~PZEM004Tv30
  *

PZEM004Tv30.h

@@ -63,6 +63,11 @@ class PZEM004Tv30
     PZEM004Tv30(uint8_t receivePin, uint8_t transmitPin, uint8_t addr=PZEM_DEFAULT_ADDR);
 #endif
     PZEM004Tv30(HardwareSerial* port, uint8_t addr=PZEM_DEFAULT_ADDR);
+
+#ifdef ESP32
+    PZEM004Tv30(HardwareSerial* port, uint8_t rxpin, uint8_t txpin, uint8_t addr=PZEM_DEFAULT_ADDR);
+#endif
+
     ~PZEM004Tv30();
 
 

examples/ESP32HWSerial/esp32hwserial.ino

@@ -0,0 +1,61 @@
+#include <Arduino.h>
+#include <PZEM004Tv30.h>
+
+/* Hardware Serial1 is usually occupied by USB2Serial converter
+ * so we will use Serial2
+*/
+HardwareSerial PzemSerial(2);     // HW Serial UART2 default mapping is at pins IO-16 (RX2) and IO-17 (TX2)
+
+// But just for example we will remap it to pins 21 (rx) and 22 (tx) 
+PZEM004Tv30 pzem(&PzemSerial, 21, 22);
+
+void setup() {
+  Serial.begin(115200);         // Serial1 is used for console output
+}
+
+void loop() {
+    float voltage = pzem.voltage();
+    if(!isnan(voltage)){
+        Serial.print("Voltage: "); Serial.print(voltage); Serial.println("V");
+    } else {
+        Serial.println("Error reading voltage");
+    }
+
+    float current = pzem.current();
+    if(!isnan(current)){
+        Serial.print("Current: "); Serial.print(current); Serial.println("A");
+    } else {
+        Serial.println("Error reading current");
+    }
+
+    float power = pzem.power();
+    if(!isnan(power)){
+        Serial.print("Power: "); Serial.print(power); Serial.println("W");
+    } else {
+        Serial.println("Error reading power");
+    }
+
+    float energy = pzem.energy();
+    if(!isnan(energy)){
+        Serial.print("Energy: "); Serial.print(energy,3); Serial.println("kWh");
+    } else {
+        Serial.println("Error reading energy");
+    }
+
+    float frequency = pzem.frequency();
+    if(!isnan(frequency)){
+        Serial.print("Frequency: "); Serial.print(frequency, 1); Serial.println("Hz");
+    } else {
+        Serial.println("Error reading frequency");
+    }
+
+    float pf = pzem.pf();
+    if(!isnan(pf)){
+        Serial.print("PF: "); Serial.println(pf);
+    } else {
+        Serial.println("Error reading power factor");
+    }
+    Serial.printf("End: %u\n", millis());
+
+    delay(5000);
+}