Spi TFT screen and BME 280 problem

Using Arduino Programming Questions
#1

whenever i use multiple devices on spi : tft screen, https://www.arduino.cc/en/Guide/TFT) and the bme 280 (breakout board from adafruit) the Arduino fails
to detect the devices

Code of the Tft screen with the BME280 (doesn’t work)

    // include the necessary libraries
    #include <Adafruit_Sensor.h>
    #include <Adafruit_BME280.h>
    #include <SPI.h>
    #include <SD.h>
    #include <TFT.h>   // Arduino LCD library
    #include <Wire.h>
    
    // pin definitions
    #define bme_cs  6
    #define sd_cs   7
    #define rst     8
    #define dc      9
    #define lcd_cs 10
    #define mosi   11
    #define miso   12
    #define sck    13
    
    //var definitions
    #define SEALEVELPRESSURE_HPA (1013.25)
    
    //Define hardware SPI connection with BME280
    Adafruit_BME280 bme(bme_cs); // hardware SPI
    
    // Define screen pins
    TFT TFTscreen = TFT(lcd_cs, dc, rst);
    
    //Define variables
    char sensorPrintout1[6];
    char sensorPrintout2[6];
    unsigned long delayTime;
    
    
    // this variable represents the image to be drawn on screen
    PImage logo;
    
    void setup() 
    {
      // Start serial communication
      Serial.begin(9600);
      while (!Serial) {  }
    
      bool status;
      
      // Initializing SD card
      Serial.print("Initializing SD card...");
      if (!SD.begin(sd_cs)) 
      {
        Serial.println("failed!");
        //while (1);
      }
      else
      {
        Serial.println("OK!");
      }
    
      //Initializing BME280
      Serial.print("Initializing BME280");
      status = bme.begin();  
      if (!status) 
      {
        Serial.println("Could not find a valid BME280 sensor, check wiring!");
        while (1);
      }
      else
      {
        Serial.println("BME 280 sensor found");      
      }
      
      // Start and clear TFT screen
      TFTscreen.begin();
      TFTscreen.background(0, 0, 0);
    
      // Lookup image on TFT screen
      logo = TFTscreen.loadImage("Logo.bmp");
      if (!logo.isValid()) 
      {
        Serial.println("error while loading Logo.bmp");
      }
      if (logo.isValid() == false) 
      {
        return;
      }
    
      //Draw logo on the screen      
      Serial.println("drawing image");
      TFTscreen.image(logo, 0, 0);
    
      // Change textcolor to white
      TFTscreen.stroke(255,255,255);
      
      //Write some text
      TFTscreen.setCursor(0,25);
      TFTscreen.print("temperatuur 1: ");
      TFTscreen.setCursor(100,25);
      TFTscreen.print((char)247);
      TFTscreen.print("C");
      
      //write some text
      TFTscreen.setCursor(0,50);
      TFTscreen.print("luchtvochtigheid 2: ");
      TFTscreen.setCursor(100,50);
      TFTscreen.print((char)37);
      TFTscreen.print("C");
    }
    
    void loop() {
      // Read value of temperature
      int value1 = bme.readTemperature();
      int value2 = bme.readHumidity();
      String sensorVal1 = String(value1);
      String sensorVal2 = String(value2);
      
      
      // Change sensorvalue to a character array
      sensorVal1.toCharArray(sensorPrintout1, 6);
      sensorVal2.toCharArray(sensorPrintout2, 6);
    
      // Change textolor to white
      TFTscreen.stroke(255,255,255);
      
      // Write value of temperature sensor
      TFTscreen.setCursor(55,25);
      TFTscreen.print(sensorPrintout1);
      
      // Write value of humidity sensor
      TFTscreen.setCursor(55,50);
      TFTscreen.print(sensorPrintout2);
      
      // wait  500ms
      delay(1000);
    
      // Change textolor to black (aka overwrite text)
      TFTscreen.stroke(0,0,0);
      
      // Write value of temperature sensor
      TFTscreen.setCursor(55,25);
      TFTscreen.print(sensorPrintout1);
      
      // Write value of humidity sensor
      TFTscreen.setCursor(55,50);
      TFTscreen.print(sensorPrintout2);
    }

Now this is the serial output

    Initializing SD card...failed!
    Initializing BME280Could not find a valid BME280 sensor, check wiring!

at first it only showed the first line, then it stopped because of the while(1) loop. so i put it in comment to see if the BME initializes on its own.

I also tested the screen+SD card and the BME280 seperately which worked just fine

update

I tried to test the programs with the complete circuit. The program of the TFT screen works fine that way but when i try the program of the BME280 it doesn’t work.
I have to remove the TFT screen from the breadboard to make it work.

#2

If it was initially stuck here :

if (!SD.begin(sd_cs))
      {
        Serial.println("failed!");
        //while (1);
      }

Then it could be that the SD card is the problem for the SPI bus.
What happens when you disconnect the SD card's CS from pin 7 and pull it to HIGH say through a 10K resistor to disable it.

#3

Update:

It appears the problem is with the MISO/SDO pin. Since the IC (Pinouts | Adafruit BME280 Humidity + Barometric Pressure + Temperature Sensor Breakout | Adafruit Learning System) works on a 3V3 level de MISO sends out a 3V3 signal.
And for some reason if i combine this with the TFT screen the whole MISO is pulled down to 0-0.2V instead of the 0-5V that i expect.

Does anyone know a solution for this problem?

#4

If you are mixing voltages maybe you should look at something like this: 74LVC245 - Breadboard Friendly 8-bit Logic Level Shifter : ID 735 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits

#5