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luni, 19 ianuarie 2015

Indicator stare acumulator auto cu LED multicolor comandat de un ATtiny85(45)

   Dupa ce am vazut cum se poate programa un microcontroler ATtiny85 cu sketch Arduino si avand in vedere ca este mai ieftin decat un ATmega328P-PU, poate functiona si fara cuart (oscilator intern la 1MHz), am zis sa fac "ceva" si, avand in vedere ca este iarma si pot fi probleme cu acumulatorul masinii, am facut un indicator pentru starea acumulatorului si pentru alternator si releul regulator.
   Schema initiala de test a fost cea in care am pus un semireglabil conectat intre +5V si masa, iar cursorul la intrarea analogica:
ulterior am pus si divizorul rezistiv de la intrare:
si am facut un filmulet cu prima varianta la care ma gandisem, numit indicator stare acumulator auto cu ATtiny85 programat cu sketch Arduino
dar are prea deranjanta cu modul de afisare, asa ca am modificat sketch-ul sa am mai putine situatii si sa am o afisare frumoasa si nederanjanta, facand si schema completa cu alimentarea de la acumulator prin intermediul unui LM7805:
   Am facut si 3 filmulete:
RGB LED battery status with ATtiny85 as Arduino (descriere in "engleza mea"):
   Am facut si poze pentru starile indicate:
- tensiune pe acumulator mai mica de 10,8V (acumulatorul descarcat... ledul se aprinde cu intermitenta):
- tensiune pe acumulator intre 10,8V si 11,8V (daca motorul este oprit, bateria este destul de descarcata si sunt sanse sa nu porneasca masina, daca tensiunea este cu motorul pornit sunt probleme cu alternatorul si releul regulator, ledul este aprins permanent in rosu): 
- tensiune pe acumulator intre 11,8V si 13,5V (daca motorul este oprit, situatia este normala, daca motorul este pornit, bateria poate fi descarcata dupa o perioada de nefolosire sau alternatorul nu incarca suficient, trebuie verificat alternatorul si releul regulator):
- tensiune pe acumulator intre 13,5V si 14,37V (motor pornit, becuri aprinse sau nu, situatia normala, se aprinde doar ledul verde):
- tensiune pe acumulator mai mare de 14,37 (motor pornit, acumulator supravoltat, se aprinde permanent ledul albastru, iar ledul verde se aprinde cu intermitenta, trebuie verificat alternatorul si releul regulator):
   Sketch-ul scris de mine pentru schema de mai sus este:
/*
basesd sketch named "Analog Input" from Examples -> 03.Analog
created by David Cuartielles, modified 30 Aug 2011, By Tom Igoe
http://arduino.cc/en/Tutorial/AnalogInput
*/

/* original circuit made by niq_ro from http://www.tehnic.go.ro
http://nicuflorica.blogspot.ro/
http://arduinotehniq.blogspot.com/
1) uC: ATtiny85 (ATtiny45) at 1MHz (internal clock)
2) common chatode RGB LED code OSTA5131A-C, see http://nicuflorica.blogspot.ro/2012/12/arduino-uno-si-un-led-multicolor-rgb.html
- an 180ohms resistor at pin D0 (phisical pin 5) in series with RED LED at GND
- an 100ohms resistor at pin D1 (phisical pin 6) in series with GREN LED at GND
- an 100ohms resistor at pin D2 (phisical pin 7) in series with BLUE LED at GND
3) a voltage divisor 1:4 made like this: +BAT --|=10k=|-|=10k=|-|=10k=|-A2|=10k=|-GND, pin A2 is phisical pin 3
- for tests can use an 10-50kohms variabile resistor put at +5V and GND, midle at A2 (phisical pin 3)
4) Vcc (phisical pin 8) at 5V
5) GND (phisixcal pin 4) at GND
*/

int sensorPin = A2;   // select the input pin for the potentiometer / resistor divider
int ledRPin = 0;      // select the pin for the RED LED
int ledGPin = 1;      // select the pin for the GREEN LED
int ledBPin = 2;      // select the pin for the BLUE LED

int u = 0;  // variable to store the value coming from the sensor

float k=4.95/5; // corection voltage
// define voltage steps:
int treapta1 = 552/k;       // Ubat=10,8V
int treapta2 = 604/k;       // Ubat=11,8V
int treapta3 = 690/k;       // Ubat=13,5V
int treapta4 = 735/k;       // Ubat=14,37V (14,4V)



void setup() {
  // declare the ledPins as an OUTPUT:
  pinMode(ledRPin, OUTPUT);  
  pinMode(ledGPin, OUTPUT);
  pinMode(ledBPin, OUTPUT);
}

void loop() {
/*
  // all leds are off
    digitalWrite(ledRPin, LOW);    // turn the red led off
    digitalWrite(ledGPin, LOW);    // turn the green led off
    digitalWrite(ledBPin, LOW);    // turn the blue led off
*/ 
  
  // read the value from the sensor:
  u = analogRead(sensorPin);    

// voltage below 10,8V
if (u < treapta1)
{
  digitalWrite(ledGPin, LOW);    // turn the green led off
  digitalWrite(ledBPin, LOW);    // turn the blue led off

  digitalWrite(ledRPin, HIGH);   // turn the red led on
  delay(100);
  digitalWrite(ledRPin, LOW);    // turn the red led off
  delay(100);
  digitalWrite(ledRPin, HIGH);   // turn the red led on
  delay(100);
  digitalWrite(ledRPin, LOW);    // turn the red led off
  delay(1000);
}

// voltage ower 10,8V & below 11,8V
if (u > treapta1 && u < treapta2)
{
  digitalWrite(ledGPin, LOW);    // turn the green led off
  digitalWrite(ledBPin, LOW);    // turn the blue led off

  digitalWrite(ledRPin, HIGH);   // turn the red led on
  delay(100);
}

// voltage ower 11,8V & below 13,5V
if (u > treapta2 && u < treapta3)
{ 
  digitalWrite(ledBPin, LOW);    // turn the blue led off
 
  digitalWrite(ledRPin, HIGH);   // turn the red led on
  delay(500);
  digitalWrite(ledRPin, LOW);    // turn the red led off
  delay(100);
  digitalWrite(ledGPin, HIGH);   // turn the green led on
  delay(200);
}

// voltage ower 13,5V & below 14,37V
if (u >= treapta3 && u < treapta4)
{ 
  digitalWrite(ledRPin, LOW);    // turn the red led off
  digitalWrite(ledBPin, LOW);    // turn the blue led off

  digitalWrite(ledGPin, HIGH);   // turn the green led on
  delay(100);
}

// voltage ower 14,37
if (u > treapta4)
{
  digitalWrite(ledRPin, LOW);    // turn the red led off
  
  digitalWrite(ledGPin, HIGH);   // turn the green led on
  delay(500);
  digitalWrite(ledGPin, LOW);   // turn the green led off
  delay(100);
  digitalWrite(ledBPin, HIGH);   // turn the blue led on
  delay(200);
}
}
   Scrierea sketch-ului in microcontrolerul nostru, care poate fi ATTiny85 sau ATtiny45, datorita dimensiunii reduse...
se face conform indicatiilor din articolul Programarea unui microcontroler ATTiny85 cu sketch Arduino.
PS: Am desenat cu ajutorul programului CadSoft EAGLE PCB Design o varianta de cablaj pentru acest montaj:
21.01.2015
   Pentru cei care vor sa programeze clasic microcontrolerul ATtiny85 (lucreaza la 1MHz cu oscilatorul intern), pun si continutul fisierului "hex":
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