Ardunio Uno R3 & LCD & FSR

Other Hardware Sensors
1

Hi,
I am trying to pull together Uno R3 a 16*2 LCD Display and a FSR sensor through a breadboard. I'll read Force with FSR and based on examples categorize the output than display on the LCD the result text. My input source is the Mac that I also run IDE and read debug.

LCD is working, I had successfully test FSR without LCD integrated. When all is combined A0 analog port (I tried other ports and even with a timer, e.i capacitor, digital port) event FSR sensor is not connected , software continuously read fluctuating values. I have read forums entries and some internet content, common ground is advised but I already use the +- of the same breadboard. Could anyone have a suggestion?
Code:

// include the library code:
#include <LiquidCrystal.h>
// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

int fsrAnalogPin = A0;
int fsrReading;
int fsrDigitalPin = 8;
int fsrDigitalReading;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);  // We'll send debugging information via the Serial monitor
  Serial.print("Setup ");
  analogReference(INTERNAL);
  //pinMode(fsrAnalogPin, INPUT) ;
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("Basi Kuvveti=");
}

void loop() {
  // put your main code here, to run repeatedly:
  fsrReading = analogRead(fsrAnalogPin);
  // read the resistor using the RCtime technique
  //fsrDigitalReading = RCtime(fsrDigitalPin);

  //if (fsrDigitalReading == 30000) {
  // if we got 30000 that means we 'timed out'
  //  Serial.println("Nothing connected!");
  //} else {
  //  Serial.print("RCtime reading = ");
  //  Serial.println(fsrDigitalReading);     // the raw analog reading

  //}
  //float voltage_A2 = fsrReading * (5 / 1023.0);
  Serial.print("Analog reading = ");
  Serial.println(fsrReading);
  //Serial.print(" ");
  //Serial.println(voltage_A2);

  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  //lcd.print(millis() / 1000);
  //lcd.print(" ");
  // We'll have a few threshholds, qualitatively determined
  Serial.println(fsrReading);
  if (fsrReading < 10) {
    lcd.print("Basi yok      ");
  } else if (fsrReading < 200) {
    lcd.print("Hafif dokunus ");
  } else if (fsrReading < 500) {
    lcd.print("Hafif basi    ");
  } else if (fsrReading < 800) {
    lcd.print("Orta basi     ");
  } else {
    lcd.print("Kuvvetli sikma");
  }


  delay(1000);
}

// Uses a digital pin to measure a resistor (like an FSR or photocell!)
// We do this by having the resistor feed current into a capacitor and
// counting how long it takes to get to Vcc/2 (for most arduinos, thats 2.5V)
int RCtime(int RCpin) {
  int reading = 0;  // start with 0

  // set the pin to an output and pull to LOW (ground)
  pinMode(RCpin, OUTPUT);
  digitalWrite(RCpin, LOW);

  // Now set the pin to an input and...
  pinMode(RCpin, INPUT);
  while (digitalRead(RCpin) == LOW) {  // count how long it takes to rise up to HIGH
    reading++;                         // increment to keep track of time

    if (reading == 30000) {
      // if we got this far, the resistance is so high
      // its likely that nothing is connected!
      break;  // leave the loop
    }
  }
  // OK either we maxed out at 30000 or hopefully got a reading, return the count

  return reading;
}

I hava also tried using a 3.3V pin rather than 5V to reduce current or lower the brightness of LED but these did not help. I thought of making a safe grounding but since it is DC that might not seem to help. I change the power supply from computer to and adapter that didn't also help.

IMG_0411
IMG_04111920×2560 319 KB

Any help would be appreciated!

2

Using the same + on a circuit is not the same as a common ground.

Code without a schematic is only telling us half the story.
A photograph of a tangle of wires is not going to tell us what we need to know to make a meaningful answer.

Note that your bread board has gaps in the graphic of lines for the busses. That means there is a break in continuity of the circuit. These need to be bridged with wires to make the bus lines work like you are expecting them to work.

1 Like
3

Legend! Mind the gap :rofl: "your bread board has gaps in the graphic of lines for the busses". Interesting that positive travels horizontal axis of top most two rows but ground not. I made inter gap ground cabling on breadboard just for grounding and it did it. Today I was to go for shopping for a avometer and isolated stand alone power supply. You save my day! Really appreciated. Best.

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