Disorder Serial.print in Multi-IMU using

[GUIMINLONG]

Hi Homer,
Veyry appreciate for your work in this build this library.

I am new learner in this. When I try the "Simp;e+MPU6050_4_MPUs_Example", signal transmitted to serial port is disoreder as figure below:

I want record all data via seral port. Therefore, I want signal from different sensor are delivered Data from in a synchronized or orderly manner like "sensor1,sensor2,sensor3,sensor4; sensor1,sensor2,sensor3,sensor4；.....". I have tried to read all the code to find a way modify the disoreder data flow, but I am not familiar with this coding languages, and can not find a way to dealing with this. Could you please tell me if there are any solution to realize an order serial.print based your library. Thanks

[GUIMINLONG]

The problem already solved. I realize it by replacing the original "mpu.dmp_read_fifo(0);" with "while (!(mpu.dmp_read_fifo(0))){}"

[ZHomeSlice]

Sorry for the delayed post.
The code is designed to capture the packets on a first come basis. or to retrieve the packet as soon as it is available no matter which MPU this could be.
just adjust the code so it calls them in order and waits for the next packet before moving on.
everything will become available within the time period set by:
mpu.Set_DMP_Output_Rate_Hz(5); // Set the DMP output rate from 200Hz to 5 Minutes.
//mpu.Set_DMP_Output_Rate_Seconds(10); // Set the DMP output rate in Seconds
//mpu.Set_DMP_Output_Rate_Minutes(5); // Set the DMP output rate in Minute

Example "in order" code:

void loop() {
digitalWrite(6, !(MPUNumber == 1)); // when MPUNumber == 1 set pin 6 LOW
digitalWrite(7, !(MPUNumber == 2)); // when MPUNumber == 2 set pin 7 LOW
digitalWrite(8, !(MPUNumber == 3)); // when MPUNumber == 3 set pin 8 LOW
digitalWrite(9, !(MPUNumber == 4)); // when MPUNumber == 4 set pin 9 LOW
if(mpu.dmp_read_fifo(0)) MPUNumber++;// When we get the packet from the FIFO buffer for the MPU requested then advance one
if (MPUNumber == 5) MPUNumber = 1; // start over
}

Z

[GUIMINLONG]

Sorry for the delayed post. The code is designed to capture the packets on a first come basis. or to retrieve the packet as soon as it is available no matter which MPU this could be. just adjust the code so it calls them in order and waits for the next packet before moving on. everything will become available within the time period set by: mpu.Set_DMP_Output_Rate_Hz(5); // Set the DMP output rate from 200Hz to 5 Minutes. //mpu.Set_DMP_Output_Rate_Seconds(10); // Set the DMP output rate in Seconds //mpu.Set_DMP_Output_Rate_Minutes(5); // Set the DMP output rate in Minute

Example "in order" code:

void loop() { digitalWrite(6, !(MPUNumber == 1)); // when MPUNumber == 1 set pin 6 LOW digitalWrite(7, !(MPUNumber == 2)); // when MPUNumber == 2 set pin 7 LOW digitalWrite(8, !(MPUNumber == 3)); // when MPUNumber == 3 set pin 8 LOW digitalWrite(9, !(MPUNumber == 4)); // when MPUNumber == 4 set pin 9 LOW if(mpu.dmp_read_fifo(0)) MPUNumber++;// When we get the packet from the FIFO buffer for the MPU requested then advance one if (MPUNumber == 5) MPUNumber = 1; // start over }

Z

Thanks for update.

Besides, very appreciate for alll your work. The whole library is very helpful for me to get a quick start with MPU imus.