Record a CSV log

MSP_RAW_IMU adds nine columns: gyroscope X Y Z, accelerometer X Y Z, and magnetometer X Y Z. Gyro is degrees per second and acceleration is in g, the same units the sensors tab draws.

MSP_ATTITUDE adds three columns, kinematics X Y Z, in degrees. MSP_ALTITUDE adds one column, altitude, in metres. MSP_RAW_GPS adds seven: fix, satellite count, latitude, longitude, altitude, speed and ground course.

MSP_ANALOG adds voltage, amperage, mAh drawn and RSSI. MSP_RC adds the stick channels, RC0 onward. Motors are eight columns. The switch calls them Mot1 to Mot8, and the CSV header names them Motor0 onward. MSP_DEBUG adds Debug0 to Debug3.

Turn on only what you need. Every extra group is another request on the link. A gyro-only file is much smaller than a file that also asks for GPS, sticks and motors.

The interval list is 10, 20, 30, 40, 50, 100, 250, 500, 1000, 2000 and 5000 milliseconds. The tab opens at 100 ms, which is 10 rows a second when the link can keep up. 10 ms asks for 100 rows a second. 5000 ms is one row every five seconds.

The dropdown and the switches lock while a recording is running. Stop logging first if you want a different interval or a different set of columns. A new file then starts with the new header.

The card on the tab says the rate is limited by the connection, and Bluetooth manages far fewer samples per second than USB. A 10 ms interval on Bluetooth will not produce 100 rows a second. Use USB in Chrome or Edge when you want the short intervals. On Bluetooth, 100 ms or slower is the honest place to start.

The first rows wait until every group you picked has answered. The recorder shows Waiting for the first readings until then, and it writes the header only after that. A short or odd reply keeps the previous sample instead of breaking the file.

Samples saved counts the rows written. The log file name appears once recording starts. REC and a minutes-and-seconds clock sit on the card. Recording continues if you switch to Sensors or Modes. It stops when the flight controller disconnects, so a dropped Bluetooth link ends the file.

CSV logs on this device lists the files already saved. An empty list says No logs yet. Share a log to open it on a computer. Swipe left to delete one, except the file that is recording now. The list shows up to 30 files.

This CSV is not a blackbox log. Blackbox is the high-rate log on the flight controller's flash, SD card or a serial logger, and the log viewer opens that. The Logging tab is the live link, written here, for a spreadsheet. Use blackbox when you need the detail of a flight.

Open the CSV in a spreadsheet and read the header first. timestamp is the first column, in milliseconds. After that come only the groups you left on, in the order IMU, attitude, altitude, GPS, battery, sticks, motors, debug. A gyro that sits near zero in that file is the same quiet board the sensors tab shows.

Chrome or Edge connects over USB or Bluetooth. Android adds Wi-Fi. iPhone uses Bluetooth or Wi-Fi and has no USB host, so an iPhone log is a Bluetooth or Wi-Fi log and will carry fewer samples than a USB log on a computer.

The same eight groups are on Betaflight and on INAV. The file is still a CSV on this device either way. Props can stay on, because this tab does not spin motors. It does use the live link, so leave the craft still if you are trying to read a quiet gyro.