Atlas EZO-RTD module

Sensor Datasheet

Documentation on the probe is found here: https://www.atlas-scientific.com/probes/dissolved-oxygen-probe/

Documentation on the measurement circuit is found here: https://www.atlas-scientific.com/circuits/ezo-dissolved-oxygen-circuit/

Sensor Constructor

Example Code

The Atlas RTD sensor is used in the menu a la carte example.

#include <sensors/AtlasScientificRTD.h>

// NOTE: Use -1 for any pins that don't apply or aren't being used.
const int8_t AtlasRTDPower    = sensorPowerPin;  // Power pin
uint8_t      AtlasRTDi2c_addr = 0x66;  // Default for RTD is 0x66 (102)
// All Atlas sensors have different default I2C addresses, but any of them can
// be re-addressed to any 8 bit number.  If using the default address for any
// Atlas Scientific sensor, you may omit this argument.

// Create an Atlas Scientific RTD sensor object
// AtlasScientificRTD atlasRTD(AtlasRTDPower, AtlasRTDi2c_addr);
AtlasScientificRTD atlasRTD(AtlasRTDPower);

// Create a temperature variable pointer for the RTD
Variable* atlasTemp = new AtlasScientificRTD_Temp(
    &atlasRTD, "12345678-abcd-1234-ef00-1234567890ab");

Classes

class AtlasScientificRTD

The Sensor sub-class for the Atlas Scientific RTD temperature sensor.

class AtlasScientificRTD_Temp

The Variable sub-class used for the temperature output from an Atlas Scientific RTD temperature sensor.

Defines

#define ATLAS_RTD_NUM_VARIABLES = 1

Sensor::_numReturnedValues; the Atlas EZO temperature circuit can report 1 value.

#define ATLAS_RTD_INC_CALC_VARIABLES = 0

Sensor::_incCalcValues; we don't calculate any additional values.

Sensor Timing

The sensor timing for an Atlas RTD (temperature) sensor

#define ATLAS_RTD_WARM_UP_TIME_MS = 740

Sensor::_warmUpTime_ms; the Atlas EZO temperature circuit warms up in 740ms.

731-735 in tests

#define ATLAS_RTD_STABILIZATION_TIME_MS = 0

Sensor::_stabilizationTime_ms; the Atlas EZO temperature circuit is stable 0ms after warm-up (stable at completion of warm up).

#define ATLAS_RTD_MEASUREMENT_TIME_MS = 650

Sensor::_measurementTime_ms; the Atlas EZO temperature circuit takes 650ms to complete a measurement.

Temperature

The temperature variable from an Atlas RTD (temperature) sensor

• Accuracy is ± (0.10°C + 0.0017 x °C)
• Range is -126°C − 125°C

#define ATLAS_RTD_RESOLUTION = 3

Decimals places in string representation; temperature should have 3 - resolution is 0.001°C.

#define ATLAS_RTD_VAR_NUM = 0

Sensor variable number; RTD is stored in sensorValues[0].

#define ATLAS_RTD_VAR_NAME = "temperature"

Variable name in ODM2 controlled vocabulary; "temperature".

#define ATLAS_RTD_UNIT_NAME = "degreeCelsius"

Variable unit name in ODM2 controlled vocabulary; "degreeCelsius" (°C)

#define ATLAS_RTD_DEFAULT_CODE = "AtlasTemp"

Default variable short code; "AtlasTemp".