mirror of
https://github.com/sigmasternchen/MH-Z-CO2-Sensors
synced 2025-03-15 06:38:55 +00:00
Save some memory
Instead of just creating an issue that the library uses a lot of memory, I wanted to save you some work instead. I have not tested this code, but i have double checked it.
This commit is contained in:
flatsiedatsie
GitHub
parent
7ede0dfc0a
commit
7e401b4625
1 changed files with 22 additions and 22 deletions
44
MHZ.cpp
44
MHZ.cpp
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@ -34,9 +34,9 @@ MHZ::MHZ(uint8_t rxpin, uint8_t txpin, uint8_t pwmpin, uint8_t type)
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void MHZ::setDebug(boolean enable) {
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debug = enable;
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if (debug) {
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Serial.println("MHZ: debug mode ENABLED");
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Serial.println(F("MHZ: debug mode ENABLED"));
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} else {
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Serial.println("MHZ: debug mode DISABLED");
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Serial.println(F("MHZ: debug mode DISABLED"));
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}
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}
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@ -46,7 +46,7 @@ boolean MHZ::isPreHeating() {
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} else if (_type == MHZ19B) {
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return millis() < (3 * 60 * 1000);
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} else {
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Serial.println("MHZ::isPreHeating() => UNKNOWN SENSOR");
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Serial.println(F("MHZ::isPreHeating() => UNKNOWN SENSOR"));
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return false;
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}
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}
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@ -58,20 +58,20 @@ boolean MHZ::isReady() {
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else if (_type == MHZ19B)
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return lastRequest < millis() - MHZ19B_RESPONSE_TIME;
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else {
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Serial.print("MHZ::isReady() => UNKNOWN SENSOR \"");
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Serial.print(F("MHZ::isReady() => UNKNOWN SENSOR \""));
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Serial.print(_type);
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Serial.println("\"");
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Serial.println(F("\""));
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return true;
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}
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}
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int MHZ::readCO2UART() {
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if (!isReady()) return STATUS_NOT_READY;
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if (debug) Serial.println("-- read CO2 uart ---");
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if (debug) Serial.println(F("-- read CO2 uart ---"));
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byte cmd[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};
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byte response[9]; // for answer
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if (debug) Serial.print(" >> Sending CO2 request");
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if (debug) Serial.print(F(" >> Sending CO2 request"));
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co2Serial.write(cmd, 9); // request PPM CO2
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lastRequest = millis();
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@ -83,7 +83,7 @@ int MHZ::readCO2UART() {
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if (debug) Serial.print(".");
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delay(100); // wait a short moment to avoid false reading
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if (waited++ > 10) {
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if (debug) Serial.println("No response after 10 seconds");
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if (debug) Serial.println(F("No response after 10 seconds"));
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co2Serial.flush();
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return STATUS_NO_RESPONSE;
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}
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@ -96,7 +96,7 @@ int MHZ::readCO2UART() {
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boolean skip = false;
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while (co2Serial.available() > 0 && (unsigned char)co2Serial.peek() != 0xFF) {
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if (!skip) {
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Serial.print("MHZ: - skipping unexpected readings:");
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Serial.print(F("MHZ: - skipping unexpected readings:"));
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skip = true;
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}
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Serial.print(" ");
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@ -118,21 +118,21 @@ int MHZ::readCO2UART() {
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if (debug) {
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// print out the response in hexa
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Serial.print(" << ");
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Serial.print(F(" << "));
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for (int i = 0; i < 9; i++) {
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Serial.print(response[i], HEX);
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Serial.print(" ");
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Serial.print(F(" "));
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}
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Serial.println("");
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Serial.println(F(""));
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}
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// checksum
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byte check = getCheckSum(response);
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if (response[8] != check) {
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Serial.println("MHZ: Checksum not OK!");
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Serial.print("MHZ: Received: ");
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Serial.println(F("MHZ: Checksum not OK!"));
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Serial.print(F("MHZ: Received: "));
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Serial.println(response[8], HEX);
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Serial.print("MHZ: Should be: ");
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Serial.print(F("MHZ: Should be: "));
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Serial.println(check, HEX);
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temperature = STATUS_CHECKSUM_MISMATCH;
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co2Serial.flush();
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@ -145,19 +145,19 @@ int MHZ::readCO2UART() {
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byte status = response[5];
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if (debug) {
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Serial.print(" # PPM UART: ");
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Serial.print(F(" # PPM UART: "));
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Serial.println(ppm_uart);
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Serial.print(" # Temperature? ");
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Serial.print(F(" # Temperature? "));
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Serial.println(temperature);
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}
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// Is always 0 for version 14a and 19b
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// Version 19a?: status != 0x40
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if (debug || status != 0) {
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Serial.print(" ! Status maybe not OK ! ");
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Serial.print(F(" ! Status maybe not OK ! "));
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Serial.println(status, HEX);
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} else if (debug) {
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Serial.print(" Status OK: ");
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Serial.print(F(" Status OK: "));
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Serial.println(status, HEX);
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}
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@ -171,7 +171,7 @@ uint8_t MHZ::getLastTemperature() {
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}
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byte MHZ::getCheckSum(byte* packet) {
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if (debug) Serial.println(" getCheckSum()");
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if (debug) Serial.println(F(" getCheckSum()"));
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byte i;
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unsigned char checksum = 0;
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for (i = 1; i < 8; i++) {
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@ -184,7 +184,7 @@ byte MHZ::getCheckSum(byte* packet) {
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int MHZ::readCO2PWM() {
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// if (!isReady()) return STATUS_NOT_READY; not needed?
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if (debug) Serial.print("-- reading CO2 from pwm ");
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if (debug) Serial.print(F("-- reading CO2 from pwm "));
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unsigned long th, tl, ppm_pwm = 0;
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do {
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if (debug) Serial.print(".");
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@ -193,7 +193,7 @@ int MHZ::readCO2PWM() {
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ppm_pwm = 5000 * (th - 2) / (th + tl - 4);
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} while (th == 0);
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if (debug) {
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Serial.print("\n # PPM PWM: ");
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Serial.print(F("\n # PPM PWM: "));
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Serial.println(ppm_pwm);
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}
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return ppm_pwm;
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