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Re: [Paparazzi-devel] simultaneously using two autopilot systems for rel

From: Chris Gough
Subject: Re: [Paparazzi-devel] simultaneously using two autopilot systems for reliability
Date: Mon, 25 Nov 2013 23:47:46 +1100

When the modem TX power is 25mw or higher, then the IMU does not work properly and also does the autopilot. It still sends messages, but the behaviour is not normal. The PFD screen does not work properly etc. We can see it on the bench. When the TX power is 1mW, then it works properly.

That makes me very suspicious of a power supply problem. Increasing the power supply (or powering the modem independently) is so much simpler than a failsafe/failover system.

Sorry if you've exhausted this line of enquiry already, but these components are usually very reliable so something must be going wrong.

Sometimes, it completely freezes and the leds do not blink. I think that we have also problems in upload.  We haven't yet tried the verification procedure of uploaded stream.  The autopilot starts working, but when it jumps to a problematic part of the code, then it stops.

What is the problematic part of the code? Does it correlate with a burst of telemetry transmission?

What peripherals do you have on the powered from the autopilot? 

Chris Gough

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