[dex1]

buondi.
caricato,in sostanza funziona ma ho dovuto ridurre i caratteri,altrimenti l'indicazione del voltaggio saltava la riga.
pero il V2 non mi rileva niente,ho provato a studiare lo sketc,ma non ho capito dove sta il problema.

#define sclk 13
#define mosi 11
#define cs   10
#define dc   9
#define rst  8  //  reset

#include <Adafruit_GFX.h>    // Core graphics library
#include <Adafruit_ST7735.h> // Hardware-specific library
#include <SPI.h>

Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, rst);

// number of analog samples to take per reading, per channel
#define NSAMP 128 // number of samples to take befor displaying (128=2^7)

// voltage divider calibration values
#define Dv1    11.00
#define Dv2    11.00

//number of channels
#define N_CH   2

// ADC reference voltage / calibration value
#define VREF    5.00

unsigned int u16_sum[2] = {0, 0};                // u16_sums of samples taken
unsigned char u8_Scount = 0;  // current sample number
float f32_AVvolts[2] = {0.0, 0.0};        // calculated voltages
char u8_cnt1 = 0;                  // used in 'for' loops

float f32_V_max[2] = {0.00 ,0.00};
float f32_V_min[2] = {100.00, 100.00};

void setup()
{
   tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab
   tft.fillScreen(ST7735_BLACK); //  clear screen
   tft.setTextColor(ST7735_WHITE);
   
   tft.setTextSize(1);
   tft.setCursor(5,0);
   tft.println("2 channel voltmeter");
   tft.setTextColor(0XFF00);
   tft.setCursor(0,140);
   tft.println(" Caution max voltage         55vdc");
}

        
void loop()
{

    ADC_Reading();          //Read voltages
    MaxMin_Detection();     //Detect MAX/MIN and mean
    
    Print_V1();     //Display V1 and V2 voltages
    Print_V2();
    
    
    
    Reset_var();    //Reset variables
}

void ADC_Reading(){
  
    while (u8_Scount < NSAMP) {
        // sample each channel A0 to A1
        for (u8_cnt1 = 0; u8_cnt1 < N_CH; u8_cnt1++) {
            u16_sum[u8_cnt1] += analogRead(A0 + u8_cnt1);
        }
        u8_Scount++;
        delay(10);
    }
}

void MaxMin_Detection(){
  
    // calculate the voltage for each channel
    for (u8_cnt1 = 0; u8_cnt1 < N_CH; u8_cnt1++) {
        f32_AVvolts[u8_cnt1] = ((u16_sum[u8_cnt1]>>7) * VREF) / 1024.0;
        if(f32_AVvolts[u8_cnt1] > f32_V_max[u8_cnt1]){ //get MAX value of sample
          f32_V_max[u8_cnt1] = f32_AVvolts[u8_cnt1];
        }
        if(f32_AVvolts[u8_cnt1] < f32_V_min[u8_cnt1]){ //get MIN value of sample
          f32_V_min[u8_cnt1] = f32_AVvolts[u8_cnt1];
        }         
    }
}

void Print_V1(){
      // voltage 1 - V1(pin A0)  
    tft.setTextColor(ST7735_YELLOW,ST7735_BLACK); // set color for V1
    tft.setTextSize(2);
    tft.setCursor(15, 20);
    tft.print("V1 ");
    tft.print(f32_AVvolts[0] * Dv1, 1);
    tft.print("V ");
    // voltage 1 - mean of V1
    tft.setTextColor(ST7735_GREEN,ST7735_BLACK);// set color for V1
    tft.setTextSize(1);
    tft.setCursor(15, 46);
    tft.print("Vmax ");
    tft.print(f32_V_max[1] * Dv1, 1);
    tft.print("V ");
    tft.setCursor(15, 63);
    tft.print("Vmin ");
    tft.print(f32_V_min[1] * Dv1, 1);
    tft.print("V ");
}

void Print_V2(){
    // voltge 2 - V2 (pin A1)
    tft.setTextColor(ST7735_CYAN,ST7735_BLACK);// set color for V2
    tft.setTextSize(2);
    tft.setCursor(15, 80);
    tft.print("V2 ");
    tft.print(f32_AVvolts[2] * Dv2, 1);
    tft.print("V ");
    // voltage 2 - mean of V2
    tft.setTextColor(ST7735_WHITE,ST7735_BLACK);// set color for V2
    tft.setTextSize(1);
    tft.setCursor(15, 106);
    tft.print("Vmax ");
    tft.print(f32_V_max[2] * Dv2, 1);
    tft.print("V ");
    tft.setCursor(15, 123);
    tft.print("Vmin ");
    tft.print(f32_V_min[2] * Dv2, 1);
    tft.print("V ");
}

void Reset_var(){
      // reset variables
    u8_Scount = 0;
    for (u8_cnt1 = 0; u8_cnt1 < N_CH; u8_cnt1++) {
        u16_sum[u8_cnt1] = 0;
    }
}