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212 lines
5.5 KiB
212 lines
5.5 KiB
// -----------------------------------------------------------------------------
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// EZO™ pH Circuit from Atlas Scientific
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//
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// Uses SoftwareSerial library
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// Copyright (C) 2018 by Rui Marinho <ruipmarinho at gmail dot com>
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && EZOPH_SUPPORT
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#pragma once
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#include <SoftwareSerial.h>
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#include "BaseSensor.h"
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class EZOPHSensor : public BaseSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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EZOPHSensor() {
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_count = 1;
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_sensor_id = SENSOR_EZOPH_ID;
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}
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~EZOPHSensor() {
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if (_serial) delete _serial;
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}
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// ---------------------------------------------------------------------
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void setRX(unsigned char pin_rx) {
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if (_pin_rx == pin_rx) return;
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_pin_rx = pin_rx;
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_dirty = true;
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}
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void setTX(unsigned char pin_tx) {
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if (_pin_tx == pin_tx) return;
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_pin_tx = pin_tx;
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_dirty = true;
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}
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// ---------------------------------------------------------------------
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unsigned char getRX() {
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return _pin_rx;
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}
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unsigned char getTX() {
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return _pin_tx;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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// Initialization method, must be idempotent
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void begin() {
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if (!_dirty) return;
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if (_serial) delete _serial;
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_serial = new SoftwareSerial(_pin_rx, _pin_tx);
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_serial->enableIntTx(false);
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_serial->begin(9600);
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_ready = true;
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_dirty = false;
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}
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// Descriptive name of the sensor
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String description() {
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char buffer[28];
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snprintf(buffer, sizeof(buffer), "EZOPH @ SwSerial(%u,%u)", _pin_rx, _pin_tx);
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return String(buffer);
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}
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// Descriptive name of the slot # index
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String description(unsigned char index) {
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return description();
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};
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// Address of the sensor (it could be the GPIO or I2C address)
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String address(unsigned char index) {
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char buffer[6];
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snprintf(buffer, sizeof(buffer), "%u:%u", _pin_rx, _pin_tx);
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return String(buffer);
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}
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// Type for slot # index
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unsigned char type(unsigned char index) {
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if (index == 0) return MAGNITUDE_PH;
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return MAGNITUDE_NONE;
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}
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void tick() {
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_setup();
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_read();
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}
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// Current value for slot # index
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double value(unsigned char index) {
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if (index == 0) return _ph;
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return 0;
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}
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protected:
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// ---------------------------------------------------------------------
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// Protected
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// ---------------------------------------------------------------------
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void _setup() {
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if (_sync_responded) {
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return;
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}
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_error = SENSOR_ERROR_WARM_UP;
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String sync_serial = "";
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sync_serial.reserve(30);
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if (!_sync_requested) {
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_serial->write(67); // C
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_serial->write(44); // ,
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_serial->write(63); // ?
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_serial->write(13); // \r
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_serial->flush();
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_sync_requested = true;
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}
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while ((_serial->available() > 0)) {
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char sync_char = (char)_serial->read();
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sync_serial += sync_char;
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if (sync_char == '\r') {
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break;
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}
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}
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if (sync_serial.startsWith("?C,")) {
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_sync_interval = sync_serial.substring(sync_serial.indexOf(",") + 1).toInt() * 1000;
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if (_sync_interval == 0) {
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_error = SENSOR_ERROR_OTHER;
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return;
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}
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}
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if (sync_serial.startsWith("*OK")) {
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_sync_responded = true;
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}
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if (!_sync_responded) {
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return;
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}
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_error = SENSOR_ERROR_OK;
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}
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void _read() {
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if (_error != SENSOR_ERROR_OK) {
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return;
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}
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if (millis() - _ts <= _sync_interval) {
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return;
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}
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_ts = millis();
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String ph_serial = "";
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ph_serial.reserve(30);
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while ((_serial->available() > 0)) {
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char ph_char = (char)_serial->read();
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ph_serial += ph_char;
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if (ph_char == '\r') {
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break;
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}
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}
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if (ph_serial == "*ER") {
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_error = SENSOR_ERROR_OTHER;
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return;
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}
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_ph = ph_serial.toFloat();
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_error = SENSOR_ERROR_OK;
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}
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bool _sync_requested = false;
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bool _sync_responded = false;
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unsigned long _sync_interval = 100000; // Maximum continuous reading interval allowed is 99000 milliseconds.
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unsigned long _ts = 0;
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double _ph = 0;
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unsigned int _pin_rx;
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unsigned int _pin_tx;
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SoftwareSerial * _serial = NULL;
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};
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#endif // SENSOR_SUPPORT && EZOPH_SUPPORT
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