You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
194 lines
5.7 KiB
194 lines
5.7 KiB
// -----------------------------------------------------------------------------
|
|
// ADS121-based Energy Monitor Sensor over I2C
|
|
// Copyright (C) 2017-2018 by Xose Pérez <xose dot perez at gmail dot com>
|
|
// -----------------------------------------------------------------------------
|
|
|
|
#if SENSOR_SUPPORT && EMON_ADC121_SUPPORT
|
|
|
|
#pragma once
|
|
|
|
#include "Arduino.h"
|
|
#include "EmonSensor.h"
|
|
|
|
#if I2C_USE_BRZO
|
|
#include <brzo_i2c.h>
|
|
#else
|
|
#include <Wire.h>
|
|
#endif
|
|
|
|
// ADC121 Registers
|
|
#define ADC121_REG_RESULT 0x00
|
|
#define ADC121_REG_ALERT 0x01
|
|
#define ADC121_REG_CONFIG 0x02
|
|
#define ADC121_REG_LIMITL 0x03
|
|
#define ADC121_REG_LIMITH 0x04
|
|
#define ADC121_REG_HYST 0x05
|
|
#define ADC121_REG_CONVL 0x06
|
|
#define ADC121_REG_CONVH 0x07
|
|
|
|
#define ADC121_RESOLUTION 12
|
|
#define ADC121_CHANNELS 1
|
|
|
|
class EmonADC121Sensor : public EmonSensor {
|
|
|
|
public:
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Public
|
|
// ---------------------------------------------------------------------
|
|
|
|
EmonADC121Sensor(): EmonSensor() {
|
|
_channels = ADC121_CHANNELS;
|
|
_sensor_id = SENSOR_EMON_ADC121_ID;
|
|
init();
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Sensor API
|
|
// ---------------------------------------------------------------------
|
|
|
|
// Initialization method, must be idempotent
|
|
void begin() {
|
|
|
|
if (!_dirty) return;
|
|
_dirty = false;
|
|
|
|
// Discover
|
|
unsigned char addresses[] = {0x50, 0x51, 0x52, 0x54, 0x55, 0x56, 0x58, 0x59, 0x5A};
|
|
_address = _begin_i2c(_address, sizeof(addresses), addresses);
|
|
if (_address == 0) return;
|
|
|
|
// Init sensor
|
|
#if I2C_USE_BRZO
|
|
uint8_t buffer[2];
|
|
buffer[0] = ADC121_REG_CONFIG;
|
|
buffer[1] = 0x00;
|
|
brzo_i2c_start_transaction(_address, I2C_SCL_FREQUENCY);
|
|
brzo_i2c_write(buffer, 2, false);
|
|
brzo_i2c_end_transaction();
|
|
#else
|
|
Wire.beginTransmission(_address);
|
|
Wire.write(ADC121_REG_CONFIG);
|
|
Wire.write(0x00);
|
|
Wire.endTransmission();
|
|
#endif
|
|
|
|
// Just one channel
|
|
_count = _magnitudes;
|
|
|
|
// Bit depth
|
|
_resolution = ADC121_RESOLUTION;
|
|
|
|
// Call the parent class method
|
|
EmonSensor::begin();
|
|
|
|
// warmup channel 0 (the only one)
|
|
read(0);
|
|
|
|
}
|
|
|
|
// Descriptive name of the sensor
|
|
String description() {
|
|
char buffer[30];
|
|
snprintf(buffer, sizeof(buffer), "EMON @ ADC121 @ I2C (0x%02X)", _address);
|
|
return String(buffer);
|
|
}
|
|
|
|
// Pre-read hook (usually to populate registers with up-to-date data)
|
|
void pre() {
|
|
|
|
if (_address == 0) {
|
|
_error = SENSOR_ERROR_UNKNOWN_ID;
|
|
return;
|
|
}
|
|
|
|
_current[0] = read(0);
|
|
|
|
#if EMON_REPORT_ENERGY
|
|
static unsigned long last = 0;
|
|
if (last > 0) {
|
|
_energy[0] += (_current[0] * _voltage * (millis() - last) / 1000);
|
|
}
|
|
last = millis();
|
|
#endif
|
|
|
|
_error = SENSOR_ERROR_OK;
|
|
|
|
}
|
|
|
|
// Type for slot # index
|
|
unsigned char type(unsigned char index) {
|
|
_error = SENSOR_ERROR_OK;
|
|
unsigned char i=0;
|
|
#if EMON_REPORT_CURRENT
|
|
if (index == i++) return MAGNITUDE_CURRENT;
|
|
#endif
|
|
#if EMON_REPORT_POWER
|
|
if (index == i++) return MAGNITUDE_POWER_APPARENT;
|
|
#endif
|
|
#if EMON_REPORT_ENERGY
|
|
if (index == i) return MAGNITUDE_ENERGY;
|
|
#endif
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return MAGNITUDE_NONE;
|
|
}
|
|
|
|
// Current value for slot # index
|
|
double value(unsigned char index) {
|
|
|
|
_error = SENSOR_ERROR_OK;
|
|
unsigned char channel = index / _magnitudes;
|
|
|
|
unsigned char i=0;
|
|
#if EMON_REPORT_CURRENT
|
|
if (index == i++) return _current[channel];
|
|
#endif
|
|
#if EMON_REPORT_POWER
|
|
if (index == i++) return _current[channel] * _voltage;
|
|
#endif
|
|
#if EMON_REPORT_ENERGY
|
|
if (index == i) return _energy[channel];
|
|
#endif
|
|
|
|
_error = SENSOR_ERROR_OUT_OF_RANGE;
|
|
return 0;
|
|
|
|
}
|
|
|
|
protected:
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Protected
|
|
// ---------------------------------------------------------------------
|
|
|
|
unsigned int readADC(unsigned char channel) {
|
|
|
|
(void) channel;
|
|
|
|
unsigned int value;
|
|
|
|
#if I2C_USE_BRZO
|
|
uint8_t buffer[2];
|
|
buffer[0] = ADC121_REG_RESULT;
|
|
brzo_i2c_start_transaction(_address, I2C_SCL_FREQUENCY);
|
|
brzo_i2c_write(buffer, 1, false);
|
|
brzo_i2c_read(buffer, 2, false);
|
|
brzo_i2c_end_transaction();
|
|
value = (buffer[0] & 0x0F) << 8;
|
|
value |= buffer[1];
|
|
#else
|
|
Wire.beginTransmission(_address);
|
|
Wire.write(ADC121_REG_RESULT);
|
|
Wire.endTransmission();
|
|
Wire.requestFrom(_address, (unsigned char) 2);
|
|
value = (Wire.read() & 0x0F) << 8;
|
|
value = value + Wire.read();
|
|
#endif
|
|
|
|
return value;
|
|
|
|
}
|
|
|
|
};
|
|
|
|
#endif // SENSOR_SUPPORT && EMON_ADC121_SUPPORT
|