Whenever I use multiple devices on SPI : TFT Screen, https://www.arduino.cc/en/Guide/TFT) and the BME280 (breakout board from adafruit) the Arduino fails to detect the devices

Code of the screen seperately (works)

// include the necessary libraries #include <SPI.h> #include <SD.h> #include <TFT.h> // Arduino LCD library // pin definitions #define sd_cs 7 #define lcd_cs 10 #define dc 9 #define rst 8 // Define screen pins TFT TFTscreen = TFT(lcd_cs, dc, rst); //Define variables char sensorPrintout[4]; char sensorPrintout2[4]; // this variable represents the image to be drawn on screen PImage logo; void setup() { // Start serieële connectie Serial.begin(9600); while (!Serial) { } // Toegang sd-kaart Serial.print("Initializing SD card..."); if (!SD.begin(sd_cs)) { Serial.println("failed!"); return; } else { Serial.println("OK!"); } // 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("Schuif 1: "); TFTscreen.setCursor(75,25); TFTscreen.print((char)247); TFTscreen.print("C"); //Write some text TFTscreen.setCursor(0,50); TFTscreen.print("Schuif 2: "); TFTscreen.setCursor(75,50); TFTscreen.print((char)247); TFTscreen.print("C"); } void loop() { // Read value of A0 int value = analogRead(A0); Serial.println(value); float voltage = value * (5.0/1023.0); Serial.println(voltage); String sensorVal = String(analogRead(A0)); String sensorVal2 = String(voltage); // Change sensorvalue to a character array sensorVal.toCharArray(sensorPrintout, 4); sensorVal2.toCharArray(sensorPrintout2, 4); // Change textolor to white TFTscreen.stroke(255,255,255); // Write value of sensor 1 TFTscreen.setCursor(55,25); TFTscreen.print(sensorPrintout); // Write value of sensor 2 TFTscreen.setCursor(55,50); TFTscreen.print(sensorPrintout2); // wait 500ms delay(1000); // Change textcolor to black TFTscreen.stroke(0,0,0); // Write value of sensor 1 TFTscreen.setCursor(55,25); TFTscreen.print(sensorPrintout); // Write value of sensor 2 TFTscreen.setCursor(55,50); TFTscreen.print(sensorPrintout2); } 

Code of the BME280 seperately (works)

#include <Wire.h> #include <SPI.h> #include <Adafruit_Sensor.h> #include <Adafruit_BME280.h> #define BME_SCK 13 #define BME_MISO 12 #define BME_MOSI 11 #define BME_CS 6 #define SEALEVELPRESSURE_HPA (1013.25) //Adafruit_BME280 bme; // I2C Adafruit_BME280 bme(BME_CS); // hardware SPI //Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI unsigned long delayTime; void setup() { Serial.begin(9600); Serial.println(F("BME280 test")); bool status; // default settings // (you can also pass in a Wire library object like &Wire2) status = bme.begin(); if (!status) { Serial.println("Could not find a valid BME280 sensor, check wiring!"); while (1); } Serial.println("-- Default Test --"); delayTime = 1000; Serial.println(); delay(100); // let sensor boot up } void loop() { printValues(); delay(delayTime); } void printValues() { Serial.print("Temperature = "); Serial.print(bme.readTemperature()); Serial.println(" *C"); Serial.print("Pressure = "); Serial.print(bme.readPressure() / 100.0F); Serial.println(" hPa"); Serial.print("Approx. Altitude = "); Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA)); Serial.println(" m"); Serial.print("Humidity = "); Serial.print(bme.readHumidity()); Serial.println(" %"); Serial.println(); } 

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:

I also tested the screen+SDcard and the BME280 separately 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.

update2

after some measurements with the scope i determined that the MOSI is pulled to 0V when I connect the 5V to the TFT screen. I also saw that the MOSI output on the BME280 board is 3.3V intead of 5V.

could it be that the conflicting voltages is the cause for all my troubles?

Whenever I use multiple devices on SPI, TFT Screen, and the BME280 breakout board from Adafruit, the Arduino fails to detect the devices.

Code of the screen separately (works)

// include the necessary libraries #include <SPI.h> #include <SD.h> #include <TFT.h> // Arduino LCD library // pin definitions #define sd_cs 7 #define lcd_cs 10 #define dc 9 #define rst 8 // Define screen pins TFT TFTscreen = TFT(lcd_cs, dc, rst); //Define variables char sensorPrintout[4]; char sensorPrintout2[4]; // this variable represents the image to be drawn on screen PImage logo; void setup() { Serial.begin(9600); while (!Serial) { } Serial.print("Initializing SD card..."); if (!SD.begin(sd_cs)) { Serial.println("failed!"); return; } else { Serial.println("OK!"); } // 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("Schuif 1: "); TFTscreen.setCursor(75,25); TFTscreen.print((char)247); TFTscreen.print("C"); //Write some text TFTscreen.setCursor(0,50); TFTscreen.print("Schuif 2: "); TFTscreen.setCursor(75,50); TFTscreen.print((char)247); TFTscreen.print("C"); } void loop() { // Read value of A0 int value = analogRead(A0); Serial.println(value); float voltage = value * (5.0/1023.0); Serial.println(voltage); String sensorVal = String(analogRead(A0)); String sensorVal2 = String(voltage); // Change sensor value to a character array sensorVal.toCharArray(sensorPrintout, 4); sensorVal2.toCharArray(sensorPrintout2, 4); // Change text color to white TFTscreen.stroke(255,255,255); // Write value of sensor 1 TFTscreen.setCursor(55,25); TFTscreen.print(sensorPrintout); // Write value of sensor 2 TFTscreen.setCursor(55,50); TFTscreen.print(sensorPrintout2); // wait 500ms delay(1000); // Change text color to black TFTscreen.stroke(0,0,0); // Write value of sensor 1 TFTscreen.setCursor(55,25); TFTscreen.print(sensorPrintout); // Write value of sensor 2 TFTscreen.setCursor(55,50); TFTscreen.print(sensorPrintout2); } 

Code of the BME280 separately (works)

#include <Wire.h> #include <SPI.h> #include <Adafruit_Sensor.h> #include <Adafruit_BME280.h> #define BME_SCK 13 #define BME_MISO 12 #define BME_MOSI 11 #define BME_CS 6 #define SEALEVELPRESSURE_HPA (1013.25) Adafruit_BME280 bme(BME_CS); // hardware SPI unsigned long delayTime; void setup() { Serial.begin(9600); Serial.println(F("BME280 test")); bool status; // default settings // (you can also pass in a Wire library object like &Wire2) status = bme.begin(); if (!status) { Serial.println("Could not find a valid BME280 sensor, check wiring!"); while (1); } Serial.println("-- Default Test --"); delayTime = 1000; Serial.println(); delay(100); // let sensor boot up } void loop() { printValues(); delay(delayTime); } void printValues() { Serial.print("Temperature = "); Serial.print(bme.readTemperature()); Serial.println(" *C"); Serial.print("Pressure = "); Serial.print(bme.readPressure() / 100.0F); Serial.println(" hPa"); Serial.print("Approx. Altitude = "); Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA)); Serial.println(" m"); Serial.print("Humidity = "); Serial.print(bme.readHumidity()); Serial.println(" %"); Serial.println(); } 

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() { 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 text color 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 sensor value to a character array sensorVal1.toCharArray(sensorPrintout1, 6); sensorVal2.toCharArray(sensorPrintout2, 6); // Change text color 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 text color 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:

I also tested the screen+SDcard and the BME280 separately, 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.

Update 2

After some measurements with the scope I determined that the MOSI is pulled to 0V when I connect the 5V to the TFT screen. I also saw that the MOSI output on the BME280 board is 3.3V instead of 5V.

Could it be that the conflict in voltages is the cause for all my troubles?

update2

after some measurements with the scope i determined that the MOSI is pulled to 0V when I connect the 5V to the TFT screen. I also saw that the MOSI output on the BME280 board is 3.3V intead of 5V.

could it be that the conflicting voltages is the cause for all my troubles?