Wanted to do a quick test of Gimbal so flew my Iris+ up and switched to ALT HOLD, after I while it appeard it was getting higher. Suddenly it went full speed to above where I was and figured it went to RTL. I thought it was odd because I had only been flying for 5 minutes. I pulled the logs and I found that in ALT_HOLD my Iris+ kept ascending to Geofence and then RTL’d. What would cause this?
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If the throttle stick is in the middle (40% ~ 60%) the vehicle will maintain the current altitude. Outside of the mid-throttle deadzone (i.e. below 40% or above 60%) the vehicle will descend or climb depending upon the deflection of the stick. When the stick is completely down the copter will descend at 2.5m/s and if at the very top it will climb by 2.5m/s. These speeds can be adjusted with the PILOT_VELZ_MAX parameter.
The size of the deadband can be adjusted with the THR_DZ parameter (AC3.2 and higher only). This params value should be between “0” and “400” with “0” meaning no deadband. “100” would produce a deadband 10% above and below mid throttle (i.e. deadband extends from 40% to 60% throttle stick position).