Supply voltage is absolutely stable and filtered.
The sensors are soldering using proper SMD reflow techniques, so, no.
I have written some debug code and started testing the accelerometer one axis at a time.
vdd and the vddIO are both set to 2.5v for this test, but I get the same results with 1.7, 2.5, and 3.3v
Registers are as stated in my last message. All other registers are untouched.
I have added a file attachment which contains the terminal output.
At timestamp 10 I added heat from a hair dryer approximately 1 foot away from the board.
At timestamp 20 I removed the heat.
Code:
if (Debug == 1) // send raw and kalman filtered Accelerometer values to the serial uart
{
Now = millis();
if ((Now - Last_Debug_Update) > 125)
{
Serial.print("Timestamp: ");
Serial.println(millis()/125);
Last_Debug_Update = millis();
}
Est_X_Acc_Value = 0;
Est_Y_Acc_Value = 0;
Est_Z_Acc_Value = 0;
for (int i = 0; i < READ_IMU_ACC_SAMPLES; i++)
{
//Value1 = myIMU.readRawAccelX();
Value1 = myIMU.readFloatAccelX();
Est_X_Acc_Value = (Est_X_Acc_Value + KalmanFilterAccX.updateEstimate(Value1));
//Value2 = myIMU.readRawAccelY();
Value2 = myIMU.readFloatAccelY();
Est_Y_Acc_Value = (Est_Y_Acc_Value + KalmanFilterAccY.updateEstimate(Value2));
//Value3 = myIMU.readRawAccelZ();
Value3 = myIMU.readFloatAccelZ();
Est_Z_Acc_Value = (Est_Z_Acc_Value + KalmanFilterAccZ.updateEstimate(Value3));
delay(1);
}
Est_X_Acc_Value = Est_X_Acc_Value/READ_IMU_ACC_SAMPLES;
Est_Y_Acc_Value = Est_Y_Acc_Value/READ_IMU_ACC_SAMPLES;
Est_Z_Acc_Value = Est_Z_Acc_Value/READ_IMU_ACC_SAMPLES;
Serial.print("Raw X= ");
Serial.print(Value1);
Serial.print(" ");
Serial.print("Kalman X= ");
Serial.print(Est_X_Acc_Value);
Serial.print(" ");
Serial.print("Raw Y= ");
Serial.print(Value2);
Serial.print(" ");
Serial.print("Kalman Y= ");
Serial.print(Est_Y_Acc_Value);
Serial.print(" ");
Serial.print("Raw Z= ");
Serial.print(Value3);
Serial.print(" ");
Serial.print("Kalman Z= ");
Serial.println(Est_Z_Acc_Value);
return;
} // End Debug = 1
