I just start with a project utilizing ardupilot quadcopters. I cannot utilize the terminal function in mission planner to do sonar tests. After I assembled the sensor, connect the apm board to mission planner and click 'connect' under terminal tab, the terminal window shows as following:
I didn't input anything after connect and the screen just pops up with random codes.
I use the latest v3.3 quadcopter firmware.
Another thing is that I could not monitor sonar range after I assembled the standard Max XL- EZL0 MB1240 analog sonar. In the optional hardware initialization process I see this:
I could not click enable for this version of firmware. I could not test sonar built-in in terminal either
Here's the latest work I've tried to fix the problem:
I downgrade the firmware to V3.01. Test sonar works in terminal for this version of firmware, but in the optional hardware initialization process I still could not click enable, nor selecting sonar type. In status bar of flight data, I always see 0 and 0 for sonar range and sonar voltage (for both versions of firmware). The sonar sensor is intact (I monitored the voltage change on Pin 3 of the sonar using oscilloscope)
If anyone who have encountered similar problem please leave a message. Thank you so much!