Create bbn_m5atomS3_lite_voltmeter.ino

bbn_m5atomS3_lite_voltmeter/bbn_m5atomS3_lite_voltmeter.ino

@@ -0,0 +1,56 @@
+#include <M5AtomS3.h>
+#include <M5Unified.h>
+#include <Arduino.h>
+#include <M5_ADS1115.h>
+#include <Wire.h>
+#include "NmeaXDR.h"
+
+/*
+ * @Hardwares: M5AtomS3 Lite + Unit Vmeter ADS1115
+ * @Dependent Library:
+ * M5_ADS1115: https://github.com/m5stack/M5-ADS1115
+ */
+
+#define M5_UNIT_VMETER_I2C_ADDR             0x49
+#define M5_UNIT_VMETER_EEPROM_I2C_ADDR      0x53
+#define M5_UNIT_VMETER_PRESSURE_COEFFICIENT 0.015918958F
+
+ADS1115 Vmeter;
+
+float resolution         = 0.0;
+float calibration_factor = 0.0;
+
+void setup() {
+  auto cfg = M5.config();
+  AtomS3.begin(cfg);
+  Wire.begin();
+  Serial.begin(4800);
+  while (!Vmeter.begin(&Wire, M5_UNIT_VMETER_I2C_ADDR, G2, G1, 100000U)) {
+    Serial.println("Unit Vmeter Init Fail");
+    delay(1000);
+  }
+  Vmeter.setEEPROMAddr(M5_UNIT_VMETER_EEPROM_I2C_ADDR);
+  Vmeter.setMode(ADS1115_MODE_SINGLESHOT);
+  Vmeter.setRate(ADS1115_RATE_8);
+  Vmeter.setGain(ADS1115_PGA_512);
+  // | PGA      | Max Input Voltage(V) |
+  // | PGA_6144 |        128           |
+  // | PGA_4096 |        64            |
+  // | PGA_2048 |        32            |
+  // | PGA_512  |        16            |
+  // | PGA_256  |        8             |
+
+  resolution = Vmeter.getCoefficient() / M5_UNIT_VMETER_PRESSURE_COEFFICIENT;
+  calibration_factor = Vmeter.getFactoryCalibration();
+}
+
+void loop() {
+  int16_t adc_raw = Vmeter.getSingleConversion();
+  float voltage   = adc_raw * resolution * calibration_factor;
+  //Serial.printf("Cal ADC:%.0f\n", adc_raw * calibration_factor);
+  //Serial.printf("Cal Voltage:%.2f mV\n", voltage);
+  //Serial.printf("Raw ADC:%d\n\n", adc_raw);
+  gen_nmea0183_xdr("$BBXDR,U,%.3f,V,VOLT", voltage / 1000);   // Volt
+  delay(1000);
+}
+