modify test serial

reaper7#7 (comment)

examples/sdm_test_serial/sdm_test_serial.ino

@@ -0,0 +1,67 @@
+/*
+ * 
+ * 
+ * https://github.com/reaper7/SDM_Energy_Meter
+ * 
+ */
+
+
+#include <SDM.h>
+
+// SDM<9600> sdm;
+SDM sdm(Serial, 9600, NOT_A_PIN, SERIAL_8N1, false);
+
+
+void setup() {
+  pinMode(BUILTIN_LED, OUTPUT);
+  digitalWrite(BUILTIN_LED, HIGH);
+  sdm.begin();
+}
+
+void loop() {
+  float tmpVol = NAN;
+  float tmpAmp = NAN;
+  float tmpWat = NAN;
+  float tmpFre = NAN;
+  float tmpEne = NAN;
+
+  tmpVol = sdm.readVal(SDM220T_VOLTAGE);
+  delay(50);
+  tmpAmp = sdm.readVal(SDM230_CURRENT);
+  delay(50);
+  tmpWat = sdm.readVal(SDM230_POWER);
+  delay(50);
+  tmpFre = sdm.readVal(SDM230_FREQUENCY);
+  delay(50);
+  tmpEne = sdm.readVal(SDM230_TOTAL_ACTIVE_ENERGY);
+
+
+  if (!isnan(tmpVol)) {
+    digitalWrite(BUILTIN_LED, LOW);
+    Serial.println();
+    Serial.print("Voltage:   ");
+    Serial.print(tmpVol);
+    Serial.println("V");
+
+    Serial.print("Current:   ");
+    Serial.print(tmpAmp);
+    Serial.println("A");
+
+    Serial.print("Power:     ");
+    Serial.print(tmpWat);
+    Serial.println("W");
+
+    Serial.print("Frequency: ");
+    Serial.print(tmpFre);
+    Serial.println("Hz");
+
+    Serial.print("Total Energy: ");
+    Serial.print(tmpEne);
+    Serial.println("kWh");
+
+  }
+
+  delay(1000);
+  digitalWrite(BUILTIN_LED, HIGH);
+  delay(1000);
+}