Hi guys! I'm my lithium-ion batteries using this schematic.. I used a IRFZ44N MOSFET. my problem is I'm not getting the voltage at no load (vtgBatUnloaded) . can you please look at my code? Will surely appreciate your help. thanks guys!
#define STATE_WAITING 0
#define STATE_MEASURING 1
#define STATE_MEASURING_ENDED 2
#define BAT_LI 0
float vtgBatUnlod;
float vtgBatLoaded;
float vtgBatUnloaded;
float vtgLoad;
float vtgDropOnLoad;
float vtgDropRin;
float rLoad= 10.0 ; //resistanse of the load in Ohms
float rIn;
float batCurrent;
float mAh;
uint8_t FET_Base=7;
uint8_t state=STATE_WAITING;
float cutoff;
boolean DischargeAllowed=false;
String BatTypeString;
void setup() {
Serial.begin(9600);
pinMode(FET_Base,OUTPUT);
digitalWrite(FET_Base,LOW);
}
void loop() {
// put your main code here, to run repeatedly:
if (state==STATE_MEASURING)
{
vtgBatUnloaded=analogRead(0)*5.0/1024.0; //get the voltage of UNLOADED battery
}
if (vtgBatUnloaded<cutoff)
{
state=STATE_MEASURING_ENDED;
}
digitalWrite(FET_Base,HIGH); //turn the MOSFET on
delay(1000);
vtgBatLoaded=analogRead(0)*5.0/1024.0; //get the voltage of LOADED battery
vtgLoad=analogRead(1)*5.0/1024.0;
digitalWrite(FET_Base,LOW);//turn the MOSFET off
vtgDropOnLoad=vtgBatLoaded-vtgLoad;
rIn = ( 10 * ( vtgBatUnloaded - vtgDropOnLoad )) / vtgDropOnLoad ;
Serial.print(abs(vtgDropOnLoad));
Serial.print(" V");
Serial.println();
Serial.print(vtgBatUnloaded);
Serial.print(" V");
Serial.println();
Serial.println("Rin= ");
Serial.print(rIn);
Serial.println();
delay(3000);
}
stuart0:
The only state transition that I'm seeing in the entire code is: state=STATE_MEASURING_ENDED;
How is it supposed to enter "STATE_MEASURING"?
I updated the code.. And now the result I'm getting is only the vtgBatUnloaded.. Can you help me pleaseeee.. this is the code... I'm getting zero at vtgDropOnLoad.. I need to measure the internal resistance
#define STATE_WAITING 0
#define STATE_MEASURING 1
#define STATE_MEASURING_ENDED 2
#define BAT_LI 0
float vtgBatUnlod;
float vtgBatLoaded;
float vtgBatUnloaded;
float vtgLoad;
float vtgDropOnLoad;
float vtgDropRin;
float rLoad= 10.0 ; //resistanse of the load in Ohms
float rIn;
float batCurrent;
float mAh;
uint8_t FET_Base=7;
uint8_t state=STATE_WAITING;
float cutoff;
boolean DischargeAllowed=false;
void setup() {
Serial.begin(9600);
pinMode(FET_Base,OUTPUT);
digitalWrite(FET_Base,LOW);
}
void loop() {
if (state==STATE_MEASURING)
{
vtgBatUnloaded=analogRead(8)*5.0/1024.0; //get the voltage of UNLOADED battery
if (vtgBatUnloaded<cutoff)
{
state=STATE_MEASURING_ENDED;
}
digitalWrite(FET_Base,HIGH); //turn the MOSFET on
delay(1000);
vtgBatLoaded=analogRead(8)*5.0/1024.0; //get the voltage of LOADED battery
vtgLoad=analogRead(9)*5.0/1024.0;
digitalWrite(FET_Base,LOW);//turn the MOSFET off
vtgDropOnLoad=vtgBatLoaded-vtgLoad;
vtgDropRin=vtgBatUnloaded-vtgBatLoaded;
rIn = ( 10.3* (vtgBatUnloaded - abs(vtgDropOnLoad) ) / abs(vtgDropOnLoad));
}
else if (state==STATE_WAITING)
{
digitalWrite(FET_Base,LOW);//turn the MOSFET off
vtgBatUnloaded=analogRead(8)*5.0/1024.0; //get the voltage of UNLOADED battery
Serial.println(vtgBatUnloaded);
Serial.println(vtgDropOnLoad); Serial.print("vtgdr");
}
else if (state==STATE_MEASURING_ENDED)
{
digitalWrite(FET_Base,LOW);//turn the MOSFET off
vtgBatUnloaded=analogRead(8)*5.0/1024.0; //get the
Serial.println(vtgBatUnloaded);
}
}
