Hi,
I am trying to use an Arduino as a SMBus slave to respond to requests from the 3DR Solo. The smart batteries it uses are no longer made and are starting to die so i am looking to use a standard lipo battery with an Arduino as the "Smart Battery" collecting info from the standard battery.
Based on the code below the receiveEvent comes through and then the requestEvent. This continues for around cycles and then stops (I am assuming the Solo stops as it is not getting back the info it expects and times out).
Any advice on what could be going wrong or pointing to any examples where this has been used before would be great.
Here is the code i am using.
/*
Great info on I2C including Slave
http://www.gammon.com.au/forum/?id=10896
*/
#include <Wire.h>
const byte MY_ADDRESS = 0x0B;
int myVoltage = 15000;
byte BATT_SMBUS_VOLTAGE = 9;
unsigned long previousMillis = 0;
long interval = 1000;
int ledState = LOW;
byte command;
const int ledPin = LED_BUILTIN;
int myCounter =0;
void setup() {
command = 0;
Wire.begin (MY_ADDRESS);
Wire.onReceive (receiveEvent); // interrupt handler for incoming messages
Wire.onRequest (requestEvent); // interrupt handler for when data is wanted
//Set LED Hight to Show it has Started
pinMode(LED_BUILTIN, OUTPUT);
ledState = HIGH;
digitalWrite(ledPin, ledState);
//Begin Serial for debuging
Serial.begin(9600);
}
void loop() {
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time you were in loop
previousMillis = currentMillis;
//Decrease voltage by 5mV each second
myVoltage = myVoltage - 5 ;
}
}
void receiveEvent (int howMany)
{
command = Wire.read (); // remember command for when we get request
if (ledState == LOW) {
ledState = HIGH;
} else {
ledState = LOW;
}
digitalWrite(ledPin, ledState);
//Print register requested
Serial.print("command = ");
Serial.println(command);
} // end of receiveEvent
void requestEvent ()
{
if (command == 9){ //9 = battery voltage request
//Send voltage in 2 bytes
Wire.write((byte) (myVoltage>>8));
Wire.write((byte) (myVoltage));
//Print voltage sent and number of times loop entered
Serial.print("Send Voltage = ");
Serial.println(myVoltage);
myCounter = myCounter + 1;
Serial.print("Count = ");
Serial.println(myCounter);
}
} // end of requestEvent