Usb connection/disconnection and eeprom

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mastrumisciu

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Hi, this is domenico from italy and i love pjrc products! I've prepared a code that calibrates potentiometer and after that stores max and min values on teensy ++2 eeprom.
When i power off/on connecting/disconnecting teensy ground all stored values are correctly recalled by the code.
Instead when i connect disconnect the usb cable teensy works good except for eeprom because calibration values are not recalled correctly and i have to recalibrate everything.
Values are not deleted from eeprom since after usb cable connection if I disconnect/connect teensy ground all stored values are correctly recalled by the code.

Can you please help me on this?

Thank you,
Domenico
 
Here's the code:

#include <EEPROM.h>


const int sensorPin1 = A1;
const int ledPin1 = 26;
const int indicatorLedPin1 = 32;
const int buttonPin1 = 1;
int sensorMin1 ;
int sensorMax1 ;
int sensorValue1 = 0;


void setup() {

if(EEPROM.read(0)<2 && EEPROM.read(0)>=0)
{sensorMax1 =EEPROM.read(0)*100;sensorMax1 +=EEPROM.read(1);}
else
sensorMax1 =0;

if(EEPROM.read(2)<2 && EEPROM.read(2)>=0)
{sensorMin1 =EEPROM.read(2)*100;sensorMin1 +=EEPROM.read(3);}
else
sensorMin1 =1024; pinMode(indicatorLedPin1, OUTPUT);

pinMode (ledPin1, OUTPUT);
pinMode (buttonPin1, INPUT);

}

void loop() {

while (digitalRead(buttonPin1) == HIGH) {
calibrate1(); }


digitalWrite(indicatorLedPin1, LOW);
sensorValue1 = analogRead(sensorPin1);
sensorValue1 = map(sensorValue1, sensorMin1, sensorMax1, 0, 127);
sensorValue1 = constrain(sensorValue1, 0, 127);
analogWrite(ledPin1, sensorValue1);


}
void calibrate1() {

digitalWrite(indicatorLedPin1, HIGH);
sensorValue1 = analogRead(sensorPin1);

if (sensorValue1 > sensorMax1) {
sensorMax1 = sensorValue1;
EEPROM.write(0,sensorValue1/100);
EEPROM.write(1,sensorValue1%100);

}

if (sensorValue1 < sensorMin1) {
sensorMin1 = sensorValue1;
EEPROM.write(2,sensorValue1/100);
EEPROM.write(3,sensorValue1%100);
}
}
 
Could it be that your button pin reads logic high after rebooting even without the button pressed? Try to configure the button pin with INPUT_PULLUP, connect the button between the pin and ground making it active low. Then jump into the calibration routine when digitalRead(buttonPin1) == LOW. This should give more stable action.
 
Theremingenieur said:
Could it be that your button pin reads logic high after rebooting even without the button pressed? Try to configure the button pin with INPUT_PULLUP, connect the button between the pin and ground making it active low. Then jump into the calibration routine when digitalRead(buttonPin1) == LOW. This should give more stable action.
Click to expand...


I'm sorry, I've tried but It doesn't work unfortunatelly.
Any other help ?
Thanks,
Domenico
 
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