sigmasternchen/MH-Z-CO2-Sensors
1
0
Fork 0
mirror of https://github.com/sigmasternchen/MH-Z-CO2-Sensors synced 2025-03-15 06:38:55 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Added isPreheating and isReady to MHZ.h and reformatted.

Browse source
This commit is contained in:
Tobias Schürg 2018-07-07 12:59:32 +02:00
parent 7158f63459
commit 99729af090
4 changed files with 34 additions and 43 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
.gitignore vendored Normal file
View file

@ -0,0 +1,3 @@
.vscode/arduino.json
.vscode/c_cpp_properties.json

6
MH-Z19B.ino
View file

@ -1,7 +1,7 @@
#include <SoftwareSerial.h>
#include <ESP8266WiFi.h>
#include <SoftwareSerial.h>
#include "MHZ.h"
#define CO2_IN D2
@ -9,7 +9,6 @@
#define MH_Z19_RX D7
#define MH_Z19_TX D6
MHZ co2(MH_Z19_RX, MH_Z19_TX, CO2_IN, MHZ19B);
void setup() {
@ -18,10 +17,9 @@ void setup() {
delay(100);
Serial.println("MHZ 19B");
co2.setDebug(false);
co2.setDebug(true);
}
void loop() {
// Serial.print("\n----- Time from start: ");
// Serial.print(millis() / 1000);

37
MHZ.cpp
View file

@ -5,10 +5,8 @@
#include "MHZ.h"
MHZ:: MHZ(uint8_t rxpin, uint8_t txpin, uint8_t pwmpin, uint8_t type)
: co2Serial(rxpin, txpin)
{
MHZ::MHZ(uint8_t rxpin, uint8_t txpin, uint8_t pwmpin, uint8_t type)
: co2Serial(rxpin, txpin) {
_rxpin = rxpin;
_txpin = txpin;
_pwmpin = pwmpin;
@ -17,7 +15,6 @@ MHZ:: MHZ(uint8_t rxpin, uint8_t txpin, uint8_t pwmpin, uint8_t type)
co2Serial.begin(9600);
}
void MHZ::setDebug(boolean enable) {
debug = enable;
if (debug) {
@ -27,16 +24,15 @@ void MHZ::setDebug(boolean enable) {
}
}
int retryCount = 0;
int MHZ::readCO2UART() {
if (debug) Serial.println("-- read CO2 uart ---");
byte cmd[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};
byte response[9]; // for answer
byte response[9]; // for answer
if (debug) Serial.print(" >> Sending CO2 request");
co2Serial.write(cmd, 9); //request PPM CO2
co2Serial.write(cmd, 9); // request PPM CO2
// clear the buffer
memset(response, 0, 9);
@ -44,20 +40,20 @@ int MHZ::readCO2UART() {
int waited = 0;
while (co2Serial.available() == 0) {
if (debug) Serial.print(".");
delay(100); // wait a short moment to avoid false reading
if(waited++ > 10) {
delay(100); // wait a short moment to avoid false reading
if (waited++ > 10) {
if (debug) Serial.println("No response after 10 seconds");
co2Serial.flush();
return STATUS_NO_RESPONSE;
}
}
}
if (debug) Serial.println();
// The serial stream can get out of sync. The response starts with 0xff, try to resync.
// The serial stream can get out of sync. The response starts with 0xff, try
// to resync.
// TODO: I think this might be wrong any only happens during initialization?
boolean skip = false;
while (co2Serial.available() > 0 && (unsigned char)co2Serial.peek() != 0xFF)
{
while (co2Serial.available() > 0 && (unsigned char)co2Serial.peek() != 0xFF) {
if (!skip) {
Serial.print("MHZ: - skipping unexpected readings:");
skip = true;
@ -68,10 +64,9 @@ int MHZ::readCO2UART() {
}
if (skip) Serial.println();
if (co2Serial.available() > 0) {
int count = co2Serial.readBytes(response, 9);
if (count <9) {
if (count < 9) {
co2Serial.flush();
return STATUS_INCOMPLETE;
}
@ -105,7 +100,7 @@ int MHZ::readCO2UART() {
int ppm_uart = 256 * (int)response[2] + response[3];
temperature = response[4] - 44; // - 40;
temperature = response[4] - 44; // - 40;
byte status = response[5];
if (debug) {
@ -116,7 +111,7 @@ int MHZ::readCO2UART() {
}
// Is always 0 for version 14a and 19b
// Version a?: status != 0x40
// Version 19a?: status != 0x40
if (debug || status != 0) {
Serial.print(" ! Status maybe not OK ! ");
Serial.println(status, HEX);
@ -125,13 +120,11 @@ int MHZ::readCO2UART() {
Serial.println(status, HEX);
}
// co2Serial.flush();
co2Serial.flush();
return ppm_uart;
}
uint8_t MHZ::getLastTemperature() {
return temperature;
}
uint8_t MHZ::getLastTemperature() { return temperature; }
byte MHZ::getCheckSum(byte *packet) {
if (debug) Serial.println(" getCheckSum()");

31
MHZ.h
View file

@ -11,38 +11,35 @@
#include "WProgram.h"
#endif
// Define types of sensors.
#define MHZ14A 14
#define MHZ19B 19
#define STATUS_NO_RESPONSE -2
#define STATUS_CHECKSUM_MISMATCH -3
#define STATUS_INCOMPLETE -4
#include <SoftwareSerial.h>
class MHZ {
public:
MHZ(uint8_t rxpin, uint8_t txpin, uint8_t pwmpin, uint8_t type);
public:
MHZ(uint8_t rxpin, uint8_t txpin, uint8_t pwmpin, uint8_t type);
void setDebug(boolean enable);
void setDebug(boolean enable);
int readCO2UART();
int readCO2PWM();
uint8_t getLastTemperature();
boolean isPreHeating();
boolean isReady();
private:
uint8_t _rxpin, _txpin, _pwmpin, _type, temperature;
boolean debug = false;
int readCO2UART();
int readCO2PWM();
uint8_t getLastTemperature();
SoftwareSerial co2Serial;
byte getCheckSum(byte *packet);
private:
uint8_t _rxpin, _txpin, _pwmpin, _type, temperature;
boolean debug = false;
SoftwareSerial co2Serial;
byte getCheckSum(byte *packet);
};
#endif