sigmasternchen/MH-Z-CO2-Sensors
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added support for MH-Z19C

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This commit is contained in:
overflowerror 2021-11-27 23:02:09 +01:00
parent 7be7cf0f22
commit 51af0b1d84
3 changed files with 20 additions and 8 deletions
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20
MHZ.cpp
View file

@ -6,16 +6,19 @@
#include "MHZ.h"
const int MHZ14A = 14;
const int MHZ19B = 19;
const int MHZ19B = 119;
const int MHZ19C = 219;
const int MHZ_2K = 1;
const int MHZ_5K = 2;
const int MHZ_10K = 3;
const unsigned long MHZ14A_PREHEATING_TIME = 3L * 60L * 1000L;
const unsigned long MHZ19B_PREHEATING_TIME = 3L * 60L * 1000L;
const unsigned long MHZ19C_PREHEATING_TIME = 1L * 60L * 1000L;
const unsigned long MHZ14A_RESPONSE_TIME = (unsigned long)60 * 1000;
const unsigned long MHZ19B_RESPONSE_TIME = (unsigned long)120 * 1000;
const unsigned long MHZ19C_RESPONSE_TIME = (unsigned long)120 * 1000;
const int STATUS_NO_RESPONSE = -2;
const int STATUS_CHECKSUM_MISMATCH = -3;
@ -80,6 +83,8 @@ boolean MHZ::isPreHeating() {
return millis() < (MHZ14A_PREHEATING_TIME);
} else if (_type == MHZ19B) {
return millis() < (MHZ19B_PREHEATING_TIME);
} else if (_type == MHZ19C) {
return millis() < (MHZ19C_PREHEATING_TIME);
} else {
Serial.println(F("MHZ::isPreHeating() => UNKNOWN SENSOR"));
return false;
@ -87,12 +92,15 @@ boolean MHZ::isPreHeating() {
}
boolean MHZ::isReady() {
if (isPreHeating()) return false;
if (_type == MHZ14A)
if (isPreHeating()) {
return false;
} else if (_type == MHZ14A) {
return lastRequest < millis() - MHZ14A_RESPONSE_TIME;
else if (_type == MHZ19B)
} else if (_type == MHZ19B) {
return lastRequest < millis() - MHZ19B_RESPONSE_TIME;
else {
} else if (_type == MHZ19C) {
return lastRequest < millis() - MHZ19C_RESPONSE_TIME;
} else {
Serial.print(F("MHZ::isReady() => UNKNOWN SENSOR \""));
Serial.print(_type);
Serial.println(F("\""));
@ -250,7 +258,7 @@ int MHZ::readCO2PWM() {
return ppm_pwm;
}
void MHZ::setAutoCalibrate(boolean b) //only available for MHZ-19B with firmware < 1.6 and MHZ 14a
void MHZ::setAutoCalibrate(boolean b) //only available for MHZ-19B with firmware < 1.6, MHZ-19C and MHZ 14a
{
uint8_t cmd_enableAutoCal[9] = { 0xFF, 0x01, 0x79, 0xA0, 0x00, 0x00, 0x00, 0x00, 0xE6 };
uint8_t cmd_disableAutoCal[9] = { 0xFF, 0x01, 0x79, 0x00, 0x00, 0x00, 0x00, 0x00, 0x86};

1
MHZ.h
View file

@ -16,6 +16,7 @@
// types of sensors.
extern const int MHZ14A;
extern const int MHZ19B;
extern const int MHZ19C;
extern const int MHZ_2K;
extern const int MHZ_5k;
extern const int MHZ_10K;

7
README.md
View file

@ -1,6 +1,6 @@
# MH-Z14A, MH-Z19B CO2 ... Module
Arduino implementation for MH-Z CO2 sensors such as **MH-Z14A**, **MH-Z19B** (as I didn't find all info in one place).
Arduino implementation for MH-Z CO2 sensors such as **MH-Z14A**, **MH-Z19B** and **MH-Z19C** (as I didn't find all info in one place).
The sensor is available for ~20 bucks at the usual places.
@ -20,9 +20,12 @@ The implementation is mostly based on https://forum.arduino.cc/index.php?topic=
## Resources:
Datasheet:
Datasheet (MH-Z19B):
http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf
Datasheet (MH-Z19C):
https://pdf1.alldatasheet.com/datasheet-pdf/view/1303687/WINSEN/MH-Z19C.html
More info about the sensor:
https://revspace.nl/MHZ19