[SOLVED] Problem with Waveshare 3.5 touchscreen and Supersonic sensor HC-SR04

Projects Programming
1

Hi!
I am working on rendering automatic some functions of my Gaggia Classic espresso machine and it was coming along really nice until now.
I am currently trying to display the distance between the top of the water tank and the water level, so that i can calculate the remaining water volume and display it on the touchscreen along with other parameters.
I decided to use a supersonic module HC-SR04 situated on top of the water tank but i can/t make it work along with my TFT screen.

This is the code I use.

// Include Arduino libraries
#include <Arduino.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Wire.h>
#include <Waveshare_ILI9486.h>
#include <XPT2046_Touchscreen.h>

// Assign human-readable names to some common 16-bit color values:
#define BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF

// Pins
// Touchscreen
#define CS_PIN  4  // MOSI=11, MISO=12, SCK=13
//XPT2046_Touchscreen ts(CS_PIN);
#define TIRQ_PIN  3  //XPT2046_Touchscreen ts(CS_PIN);  // Param 2 - NULL - No interrupts
//XPT2046_Touchscreen ts(CS_PIN, 255);  // Param 2 - 255 - No interrupts

// Ultrasonic sensor
#define trigPin 52 // Sets the trigPin as an OUTPUT
#define echoPin 53

// CONSTANTS
//Touchscreen TFT
uint16_t screenColor = BLACK;
uint16_t textForeColor = WHITE;
uint16_t textBackColor = BLACK;


//Ultrasonic sensor
float duration, distance;
int pingIterations = 30;
float waterLeft = 0;
float waterAlarmLevel = 0.3;
bool WaterAlarmStatus = false;
int MAX_DISTANCE = 400; // Maximum distance we want to ping for (in centimeters).

// Constructors
Waveshare_ILI9486 Waveshield; // TFT screen
Adafruit_GFX &tft = Waveshield;  //  TFT screen
XPT2046_Touchscreen ts(CS_PIN, TIRQ_PIN);  // TFT touchscreen

namespace
{
Waveshare_ILI9486 tft;
}



void setup() {
  //Initialize sensors
  SPI.begin();         // TFT, SPI controller
  tft.begin();          // TFT
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  Serial.begin(9600);
}

void PrintOnTFT() {
  //Displays distance on tft
  tft.setRotation(1);
  tft.setTextSize(2);
  tft.setCursor(100, 100);
  tft.print("Distance: ");
  tft.print(distance);
  tft.println(" cm");
}



void Supersonic() {
  // Clears the trigPin condition
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  // Displays the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500);
}


void loop() {
  //Supersonic();
  PrintOnTFT();
}

Every time I delete the lines 'SPI.begin();', 'Waveshield.begin();' and the PrintOnTFT(); function the sensor works flawlessly.

Any ideas?

Thank you very much for your time!!

2

Pretty colors, but unreadable. Can you post code as described in the forum guidelines so us geezers can read it?

3

What Arduino board are you using? On a Mega the SPI pins are MOSI = 51, MISO = 50, SCK = 52, default CS = 53. What pins are you using for SPI? What pins are you using for the ultrasonic sensor.

4

Thank you very much!!! You were absolutely right!!!
I am using a Mega2560.
As you suspected, I was using pins 52 e 53 for the ultrasonic sensor and , after I read your link to the SPI library, I found out that these pins are reserved for the SCK and CS!
I changed them to 36 and 37 and now everything works like a charm!!!
Thank you very much!!

PS: I posted again the code again with </> as you told me! Sorry, i read the forum rules but I couldn't do it from my cellphone!

5

If, in the future, you want to post from a cell phone just put

[code]

before the start of the code and

 [/code]

at the end.

So
[code] your code here [/code] turns into

 your code here