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我正在做一個需要使用arduino uno，4個力傳感器和一個16x2 LCD的項目。我試圖通過執行按鈕在液晶顯示屏上顯示力傳感器的讀數。例如。如果我按下向上按鈕，它應該顯示第一個力傳感器讀數。問題是，即使沒有施加任何力量，它也只顯示143164976.0000的巨大數字。請諮詢我的編碼是否有問題。Arduino與fsr和LCD問題
int iForceSensorReading; // the analog reading from the FSR resistor divider
int iForceSensorReading1;
int iForceSensorReading2;
int iForceSensorReading3;
int iForceSensorVoltage; // the analog reading converted to voltage
int iForceSensorVoltage1;
int iForceSensorVoltage2;
int iForceSensorVoltage3;
unsigned long ulForceSensorResistance;// The voltage converted to resistance, can be very big so make "long"
unsigned long ulForceSensorResistance1;
unsigned long ulForceSensorResistance2;
unsigned long ulForceSensorResistance3;
unsigned long ulForceSensorConductance;
unsigned long ulForceSensorConductance1;
unsigned long ulForceSensorConductance2;
unsigned long ulForceSensorConductance3;
float FsrForce = 0; // Finally, the resistance converted to force
float FsrForce1 = 0;
float FsrForce2 = 0;
float FsrForce3 = 0;
#include <Wire.h>
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>
Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();
#define RED 0x1
#define YELLOW 0x3
#define GREEN 0x2
#define TEAL 0x6
#define BLUE 0x4
#define VIOLET 0x5
#define WHITE 0x7
void setup(void){
Serial.begin(9600); // send debugging information via the Serial monitor
lcd.begin(16, 2);
lcd.print("Hand Muscle");
lcd.setCursor(0,1);
lcd.print("Meter");
lcd.setBacklight(WHITE);
}
uint8_t i=0;
void loop(void){
uint8_t buttons = lcd.readButtons();
iForceSensorReading = analogRead(A0);//read index finger pressure
delay(30);
// analog voltage reading ranges from about 0 to 1023 which maps to 0V to 5V (= 5000mV)
iForceSensorVoltage = map(iForceSensorReading, 0, 1023, 0, 5000);
ulForceSensorConductance = conductanceFunction(ulForceSensorResistance, iForceSensorVoltage);
if (ulForceSensorConductance <= 1000){
FsrForce = ulForceSensorConductance/80;
}
else{
FsrForce = ulForceSensorConductance - 1000;
FsrForce /= 30;
}
iForceSensorReading1 = analogRead(A1);//read middle finger pressure
delay(30);
iForceSensorVoltage1 = map(iForceSensorReading1, 0, 1023, 0, 5000);
if (iForceSensorVoltage1 == 0){
}
else{
ulForceSensorConductance1 = conductanceFunction(ulForceSensorResistance1, iForceSensorVoltage1);
delay(30);
}
if (ulForceSensorConductance1 <= 1000){
FsrForce1 = ulForceSensorConductance1/80;
}
else{
FsrForce1 = ulForceSensorConductance1 - 1000;
FsrForce1 /= 30;
}
iForceSensorReading2 = analogRead(A2);// read ring finger pressure
delay(30);
iForceSensorVoltage2 = map(iForceSensorReading2, 0, 1023, 0, 5000);
ulForceSensorConductance2 = conductanceFunction(ulForceSensorResistance2, iForceSensorVoltage2);
if (ulForceSensorConductance2 <= 1000){
FsrForce2 = ulForceSensorConductance2/80;
}
else{
FsrForce2 = ulForceSensorConductance2 - 1000;
FsrForce2 /= 30;
}
iForceSensorReading3 = analogRead(A3);//read little finger pressure
delay(30);
iForceSensorVoltage3 = map(iForceSensorReading3, 0, 1023, 0, 5000);
ulForceSensorConductance3 = conductanceFunction(ulForceSensorResistance3, iForceSensorVoltage3);
if (ulForceSensorConductance3 <= 1000)
{FsrForce3 = ulForceSensorConductance3/80;
}else
{FsrForce3 = ulForceSensorConductance3 - 1000;
FsrForce3 /= 30;
}
if (buttons) {
lcd.clear();
lcd.setCursor(0,0);
if (buttons & BUTTON_UP) {
lcd.print("Index Finger: ");
lcd.setCursor(0,1);
lcd.print(FsrForce,DEC);
lcd.setBacklight(WHITE);
}
if (buttons & BUTTON_DOWN) {
lcd.print("Little Finger: ");
lcd.setCursor(0,1);
lcd.print(FsrForce3,DEC);
lcd.setBacklight(WHITE);
}
if (buttons & BUTTON_LEFT) {
lcd.print("Middle Finger: ");
lcd.setCursor(0,1);
lcd.print(FsrForce1,DEC);
lcd.setBacklight(WHITE);
}
if (buttons & BUTTON_RIGHT) {
lcd.print("Ring Finger: ");
lcd.setCursor(0,1);
lcd.print(FsrForce2,DEC);
lcd.setBacklight(WHITE);
}
if (buttons & BUTTON_SELECT) {
lcd.print("SELECT ");
lcd.setBacklight(WHITE);
}
}
}
// The voltage = Vcc * R/(R + FSR) where R = 10K and Vcc = 5V
// so FSR = ((Vcc - V) * R)/V
int conductanceFunction(long x, long y)
{long result;
x = 5000 - y; // fsrVoltage is in millivolts so 5V = 5000mV
x *= 10000; // 10K resistor
x /= y;
result = 1000000/x; //ulForceSensorConductance2 = 1000000 measured in micromhos
return result;
}