Using Arduino zero$/$uno display the light and temperature in the form of a bar graph from the BME$280$ Sensor and BH$1750$ sensor using SDI$12$ protocol. Display this information on the Arduinos build in LCD.

Code I've done so far:

#include

#include

#include

#include

#include

#include $//$ Adjust if you're using a different display

#define BHFVI$\_$PIN A$1$

#define PB$\_$PIN $2$

#define TFT$\_$CS $10$

#define TFT$\_$MOSI $11$

#define TFT$\_$RST $6$

#define TFT$\_$DC $7$

#define TFT$\_$SCLK $13$

#define DIRO $6//$ Assuming this is the pin for SDI$-12$ direction control

Adafruit$\_$BME$280$ bme;

Adafruit$\_$ST$7735$ tft $=$ Adafruit$\_$ST$7735($TFT$\_$CS$,$ TFT$\_$DC$,$TFT$\_$MOSI,TFT$\_$SCLK$,$ TFT$\_$RST$)$;

float temperature;

int lightData;

const int arraySize $=10$;

float temperatureArray$[$arraySize$]$;

int lightArray$[$arraySize$]$;

int deviceAddress $=0$; $//$ Add your device address here

void setup$()\{$

$$ Serial.begin$(9600)$;

$$ Serial$1.$begin$(1200,$ SERIAL$\_7$E$1)$;

$$

$$ if $(!$bme.begin$(0$x$76))\{//$ The I$2$C address might be $0$x$77,$ try this if $0$x$76$ doesn't work

$$ Serial.println$("$Could not find a valid BME$280$ sensor$,$ check wiring!"$)$;

$$ while $(1)$;

$\}$

$$

$$ if $(!$SD$.$begin$())\{$

$$ Serial.println$("$SD card initialization failed!"$)$;

$$ while $(1)$;

$\}$

$$

$$ tft$.$initR$($INITR$\_$BLACKTAB$)$; $//$ Or the appropriate initialization for your display

$$ tft$.$setRotation$(1)$;

$$ tft$.$fillScreen$($ST$77$XX$\_$BLACK$)$;

$$

$$ pinMode$($DIRO$,$ OUTPUT$)$;

$$ pinMode$($PB$\_$PIN, INPUT$\_$PULLUP$)$;

$$ Serial.println$("$Setup completed!"$)$;

$\}$

void loop$()\{$

$$ if $($digitalRead$($PB$\_$PIN$)==$ LOW$)\{$

$$ Serial.println$("$Button pressed, starting measurement..."$)$;

$$ int sensorStatus $=$ startMeasurement$()$;

$$ if $($sensorStatus $==2)\{$

$$ Serial.println$("$Both sensors measured successfully."$)$;

$$ sendContinuousData$()$;

$$ logData$()$;

$$ arrayFull$()$;

$$ displayGraphs$(1)$; $//$ Display temperature graph

$$ delay$(5000)$;

$$ displayGraphs$(2)$; $//$ Display light graph

$\}$ else $\{$

$$ Serial.println$("$Sensor reading failed"$)$;

$\}$

$\}$

$\}$

int startMeasurement$()\{$

$$ int temperatureToggle $=0$;

$$ int luxToggle $=0$;

$$

$$ temperature $=$ bme.readTemperature$()$;

$$ Serial.print$("$Temperature: $")$;

$$ Serial.println$($temperature$)$;

$$

$$ if $(!$isnan$($temperature$))\{$

$$ temperatureToggle $=1$;

$\}$

$$

$$ lightData $=$ analogRead$($BHFVI$\_$PIN$)$;

$$ Serial.print$("$Light Data: $")$;

$$ Serial.println$($lightData$)$;

$$

$$ if $($lightData $>0)\{$

$$ luxToggle $=1$;

$\}$

$$

$$ return temperatureToggle $+$ luxToggle;

$\}$

void sendContinuousData$()\{$

$$ String dataString $=$ String$($deviceAddress$)+"+"+$ String$($temperature$,2)+"+"+$ String$($lightData$)$;

$$ Serial.print$("$Sending continuous data: $")$;

$$ Serial.println$($dataString$)$;

$$ SDI$12$Send$($dataString$)$;

$\}$

void SDI$12$Send$($String message$)\{$

$$ Serial.print$("$SDI$-12$ Message: $")$;

$$ Serial.println$($message$)$;

$$ digitalWrite$($DIRO$,$ LOW$)$;

$$ delay$(100)$;

$$ Serial$1.$print$($message $+"\backslash$r

$")$;

$$ Serial$1.$flush$()$;

$$ Serial$1.$end$()$;

$$ Serial$1.$begin$(1200,$ SERIAL$\_7$E$1)$;

$$ digitalWrite$($DIRO$,$ HIGH$)$;

$\}$

void logData$()\{$

$$ File dataFile $=$ SD$.$open$("$datalog$.$txt$",$ FILE$\_$WRITE$)$;

$$ if $($dataFile$)\{$

$//$ You need to implement a way to get the current time, like using a RTC module

$$ Serial.println$("$Logging data..."$)$;

$$ dataFile.print$("$Time: $")$;

$$ dataFile.print$("-$ Sensor: $")$;

$$ dataFile.print$("$Temp: $")$;

$$ dataFile.print$($temperature$)$;

$$ dataFile.print$("$ C$,$ Light: $")$;

$$ dataFile.println$($lightData$)$;

$$ dataFile.close$()$;

$$ Serial.println$("$Data logged successfully."$)$;

$\}$ else $\{$

$$ Serial.println$("$Error opening datalog.txt$")$;

$\}$

$\}$

void arrayFull$()\{$

$$ Serial.println$("$Shifting array data..."$)$;

$$ for $($int i $=1$; i $<$ arraySize; i$++)\{$

$$ temperatureArray$[$i $-1]=$ temperatureArray$[$i$]$;

$$ lightArray$[$i $-1]=$ lightArray$[$i$]$;

$\}$

$$ temperatureArray$[$arraySize $-1]=$ temperature;

$$ lightArray$[$arraySize $-1]=$ lightData;

$$ Serial.println$("$Arrays updated."$)$;

$\}$

void displayGraphs$($int sensorSelection$)\{$

$$ tft$.$fillScreen$($ST$77$XX$\_$BLACK$)$;

$$ Serial.print$("$Displaying graph for: $")$;

$$ switch $($sensorSelection$)\{$

$$ case $1$:

$$ Serial.println$("$Temperature$")$;

$$ displayBarGraph$($temperatureArray$,-40,85,$ "Temp $($C$)")$;

$$ break;

$$ case $2$:

$$ Serial.println$("$Light Data"$)$;

$//$ Convert lightArray to float$[]$ before displaying

$$ float tempLightArray$[$arraySize$]$;

$$ for $($int i $=0$; i $<$ arraySize; i$++)\{$

$$ tempLightArray$[$i$]=($float$)$lightArray$[$i$]$; $//$ Casting int to float