wip

bbn_esp32_sensors_hub.ino

@@ -1,12 +1,16 @@
 #include <M5AtomS3.h>
+#include <Wire.h>
 
 #include "NmeaXDR.h"
 #include "Nmea0183Msg.h"
+#include "i2c_sensors.h"
 
 void setup() {
   auto cfg = M5.config();
   AtomS3.begin(cfg);
+  Wire.begin();
   Serial.begin(115200);
+  i2c_scan();
 }
 
 void loop() {

i2c_ads1115.h

@@ -0,0 +1,50 @@
+#ifndef i2c_ads1115_h
+#define i2c_ads1115_h
+
+#include <M5_ADS1115.h>
+
+#include "NmeaXDR.h"
+#include "Nmea0183Msg.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 i2c_ads1115_sensor;
+bool i2c_ads1115_found = false;
+
+float resolution         = 0.0;
+float calibration_factor = 0.0;
+
+void i2c_ads1115_try_init() {
+  for (int i = 0; i < 3; i++) {
+    i2c_ads1115_found = i2c_ads1115_sensor.begin(&Wire, M5_UNIT_VMETER_I2C_ADDR, G2, G1, 100000U);
+    if (i2c_ads1115_found) {
+      break;
+    }
+    delay(20);
+  }
+  if (i2c_ads1115_found) {
+    gen_nmea0183_msg("$BBTXT,01,01,01,VOLTAGE found ads1115 sensor at address=0x%s", String(M5_UNIT_VMETER_I2C_ADDR, HEX).c_str());
+    i2c_ads1115_sensor.setEEPROMAddr(M5_UNIT_VMETER_EEPROM_I2C_ADDR);
+    i2c_ads1115_sensor.setMode(ADS1115_MODE_SINGLESHOT);
+    i2c_ads1115_sensor.setRate(ADS1115_RATE_8);
+    i2c_ads1115_sensor.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 = i2c_ads1115_sensor.getCoefficient() / M5_UNIT_VMETER_PRESSURE_COEFFICIENT;
+    calibration_factor = i2c_ads1115_sensor.getFactoryCalibration();
+  }
+}
+
+#endif

i2c_sensors.h

@@ -0,0 +1,10 @@
+#ifndef i2c_sensors_h
+#define i2c_sensors_h
+
+#include "i2c_ads1115.h"
+
+void i2c_scan() {
+  i2c_ads1115_try_init();
+}
+
+#endif