Commit ffa9f3f9 authored by Käppler's avatar Käppler
Browse files

co2_sensor: introduce states

* define sensor states
* log every change of state to serial

There is no new functionality added yet.
parent 8988c746
......@@ -25,6 +25,29 @@ namespace sensor {
char timestamp[23];
int16_t stable_measurements = 0;
uint32_t waiting_color = color::blue;
/**
* Define sensor states
* INITIAL -> initial state
* BOOTUP -> state after initializing the sensor, i.e. after scd.begin()
* READY -> sensor does output valid information (> 0 ppm) and no other condition takes place
* (NOTE: This state is currently unused)
* NEEDSCALIBRATION -> sensor measurements are too low (< 250 ppm)
* PREPARECALIBRATION -> forced calibration was initiated, waiting for stable measurements
* CALIBRATION -> the sensor does calibrate itself
*/
enum state {INITIAL, BOOTUP, READY, NEEDSCALIBRATION, PREPARECALIBRATION, CALIBRATION};
const char *state_names[] = {
"INITIAL",
"BOOTUP",
"READY",
"NEEDSCALIBRATION",
"PREPARECALIBRATION",
"CALIBRATION"
};
state current_state = INITIAL;
void switchState(state);
bool should_calibrate = false;
void initialize() {
......@@ -49,6 +72,8 @@ namespace sensor {
ESP.restart();
}
switchState(BOOTUP);
// SCD30 has its own timer.
//NOTE: The timer seems to be inaccurate, though, possibly depending on voltage. Should it be offset?
Serial.println();
......@@ -116,9 +141,11 @@ namespace sensor {
Serial.println(F("Waiting until the measurements are stable for at least 2 minutes."));
Serial.println(F("It could take a very long time."));
should_calibrate = true;
switchState(PREPARECALIBRATION);
}
void calibrateAndRestart() {
switchState(CALIBRATION);
Serial.print(F("Calibrating SCD30 now..."));
scd30.setAltitudeCompensation(config::altitude_above_sea_level);
scd30.setForcedRecalibrationFactor(config::co2_calibration_level);
......@@ -137,10 +164,20 @@ namespace sensor {
Serial.println(humidity, 1);
}
void switchState(state new_state) {
if (new_state == current_state) return;
Serial.print(F("Changing sensor state: "));
Serial.print(state_names[current_state]);
Serial.print(" -> ");
Serial.println(state_names[new_state]);
current_state = new_state;
}
void displayCO2OnLedRing() {
if (co2 < 250) {
// Sensor should be calibrated.
led_effects::showWaitingLED(color::magenta);
switchState(NEEDSCALIBRATION);
return;
}
/**
......@@ -174,8 +211,11 @@ namespace sensor {
//NOTE: Data is available, but it's sometimes erroneous: the sensor outputs zero ppm but non-zero temperature and non-zero humidity.
if (co2 <= 0) {
// No measurement yet. Waiting.
switchState(BOOTUP);
led_effects::showWaitingLED(color::blue);
return false;
} else if (current_state != PREPARECALIBRATION) {
switchState(READY);
}
/**
......
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