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fixed typoes in readme and fixed error in MHZ.cpp files #24

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Sep 28, 2021
Merged

fixed typoes in readme and fixed error in MHZ.cpp files #24

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7d5590a
correct the type of sensor in readme
Jul 22, 2021
5debdcc
fix overflow in int datatype in arduino Uno.
Aug 10, 2021
5f81f45
fix the warning of implicit convert from hex to char.
Aug 10, 2021
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6 changes: 3 additions & 3 deletions MHZ.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,8 @@ 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 MHZ14A_RESPONSE_TIME = 60 * 1000;
const unsigned long MHZ19B_RESPONSE_TIME = 120 * 1000;
const unsigned long MHZ14A_RESPONSE_TIME = (unsigned long)60 * 1000;
const unsigned long MHZ19B_RESPONSE_TIME = (unsigned long)120 * 1000;

const int STATUS_NO_RESPONSE = -2;
const int STATUS_CHECKSUM_MISMATCH = -3;
Expand Down Expand Up @@ -286,7 +286,7 @@ void MHZ::setRange(int range) //only available for MHZ-19B < 1.6 and MH-Z 14a

void MHZ::calibrateZero()
{
char cmd[9] = {0xFF, 0x01, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78};
uint8_t cmd[9] = {0xFF, 0x01, 0x87, 0x00, 0x00, 0x00, 0x00, 0x00, 0x78};
_serial->write(cmd,9);
}

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2 changes: 1 addition & 1 deletion README.md
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@@ -1,6 +1,6 @@
# MH-Z14A, MH-Z19B CO2 ... Module

Arduino implementation for MH-Z CO2 sensors such as **MH-Z14A**, **MH-Z18B** (as I didn't find all info in one place).
Arduino implementation for MH-Z CO2 sensors such as **MH-Z14A**, **MH-Z19B** (as I didn't find all info in one place).

The sensor is available for ~20 bucks at the usual places.

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