Component: Air Quality (BME688) (Environmental)

Author	MatrixTSL
Version	1.0
Category	Environmental

Air Quality (BME688) component

An air quality sensor connected using a standard I2C bus. Capable of detecting indoor and outdoor air quality including CO2 H2 VOCs and VSCs.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_BME688_AirQualitySensor.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_BME688_AirQualitySensor.fcfx

Detailed description

The App Developer (Arduino Mega) component allows an Arduino Mega board to be controlled from within the Flowcode simulation runtime.

To allow Flowcode to communicate and control the Arduino Mega hardware the board must first be pre-programmed with dedicated firmware.

The firmware hex file and Flowcode source project can be downloaded from here.

Arduino Mega App Developer Firmware

More information about the workings of the firmware project can be found on the FiniteStateMachine page.

The COM port to the Arduino hardware is selected via the SCADA_Ard_Mega component COM port property.

When building the component into a App Developer project remember to expose the COM port property to allow the end user to select the correct port for the hardware.

The console window can display data in two modes which is set via a component property.

• fixed statistics showing IO / ADC inputs / PWM
• scrolling log showing all commands and returns

Examples

Pin Mapping

Here is a table showing how the App Developer Slave digital pins are mapped on the device.

App Developer Slave Digital Pin	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49
Device Port Pin	E0	E1	E2	E5	G5	E3	H3	H4	H6	H6	B4	B5	B6	B7	J1	J0	H1	H0	D3	D2	D1	D0	A0	A1	A2	A3	A4	A5	A6	A7	C7	C6	C5	C4	C3	C2	C1	C0	D7	G2	G1	G0	L7	L6	L5	L4	L3	L2	L1	L0
Arduino Style Pin	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49

Here is a table showing how the App Developer Slave analogue pins are mapped on the device.

App Developer Slave Analogue Pin

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Device Port Pin

F0

F1

F2

F3

F4

F5

F6

F7

K0

K1

K2

K3

K4

K5

K6

K7

Arduino Style Pin

A0

A1

A2

A3

A4

A5

A6

A7

A8

A9

A10

A11

A12

A13

A14

A15

Here is a table showing how the App Developer Slave peripheral pins are mapped on the device.

App Developer Slave Peripheral Pin

I2C 0 SDA

I2C 0 SCL

SPI 0 MOSI

SPI 0 MISO

SPI 0 SCK

UART 0 RX

UART 0 TX

UART 1 RX

UART 1 TX

UART 2 RX

UART 2 TX

PWM 0

PWM 1

PWM 2

PWM 3

PWM 4

PWM 5

PWM 6

PWM 7

PWM 8

PWM 9

PWM 10

PWM 11

PWM 12

PWM 13

PWM 14

PWM 15

Device Port Pin

D1

D0

B3

B4

B5

D2

D3

H0

H1

J0

J1

B7

G5

B5

B6

B7

B4

H6

E3

E4

E5

H3

H4

H5

L3

L4

L5

Arduino Style Pin

D20

D21

D50

D10

D11

D19

D18

D17

D16

D15

D14

D13

D4

D11

D12

D13

D10

D9

D5

D2

D3

D6

D7

D8

D46

D45

D44

Macro reference

Initialise

	Initialise
Initialises the I2C bus and sets up the device ready for operation. Returns 1 if the device has been found and is communicating.
- BOOL	Return

PerformGasResistanceCycle

	PerformGasResistanceCycle
Performs a forced heating cycle. Returns 1 for a successful cycle. Returns 0 if the heating time was not enough or the temperature was too high to reach.
- FLOAT	Temperature
Temperature in Celcius we want to reach, typically between 200 and 400�C
- UINT	Duration
Step duration in milliseconds, default 30 - Range: 1 to 4032
- BOOL	Return

ReadGasResistance

	ReadGasResistance
Reads the resistance of the gas in ohms from the last heating cycle.
- FLOAT	Return

ReadHumidity

	ReadHumidity
Collects the humidity and returns as a floating point value in percent.
- BYTE	Index
Forced Mode = 0 / Parallel Mode = 0-2
- FLOAT	Return

ReadPressure

	ReadPressure
Collects the pressure and returns as a floating point value in pascal.
- BYTE	Index
Forced Mode = 0 / Parallel Mode = 0-2
- FLOAT	Return

ReadRegister

	ReadRegister
A simple example showing a generic way to read a register using I2C.
- BYTE	Address
- BYTE	Return

ReadTemperature

	ReadTemperature
Collects the temperature and returns as a floating point value in degrees C.
- BYTE	Index
Forced Mode = 0 / Parallel Mode = 0-2
- FLOAT	Return

SetMode

	SetMode
Sets the mode of the sensor to low power sleep, forced or parallel
- BYTE	Mode
0=Sleep, 1=Forced, 2=Parallel
- VOID	Return

WriteRegister

	WriteRegister
A simple example showing a generic way to write a register using I2C.
- BYTE	Address
- BYTE	Data
- VOID	Return

Property reference

	Properties
	I2C Properties
	Connections
	Channel
Channel selection
	SDA
Pin used for SDA (data signal)
	SDA Remap Pin
	SCL
Pin used for SCL (clock signal)
	SCL Remap Pin
	Options
	Device Address
	Stop Delay
On older microcontroller devices there is a potential for the I2C hardware channel to lock up if there is not a 10ms delay between an I2C stop event and the next I2C start event. Most modern microcontrollers will not have a problem so this property can be disabled to speed up the I2C communications.
	Baud Select
Baud rate option selector
	Baud Rate
Baud rate to be used
	Simulation
	Simulate Comms
	Comms Simulation
	Scope Traces
Selects if the component pin connections are automatically generated on the data recorder window or not. Yes: Automatically add the component pins to a group on the data recorder which will reflect the sim data during simultion. No: Do not show the pin signals on the data recorder window.
	Console Data
Selects if the console data is automatically generated or not
	Injector
Specifies the injector component on the panel to interact with to provide comms simulation.