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

[Refik Sever]

Hi Chris,

 

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

 

We connect the modem directly to Lisa. Lisa voltage input is connected to 12V.

 

For airspeed ets and gps, we are using a separate L7805CV and convert 12V to 5V. It's capable of delivering 1.5A, but I must check if the voltage drops temporarily below 5V.

 

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

 

Lisa M does not always upload correctly. I mean the problematic part of the code as the corrupted part of the uploaded code. It does not correlate with a burst of telemetry.

 

Our airspeed ets sensor's I2C inputs are always connected to Lisa, also during upload. Although we do not give power to the Ets in the upload, its 7 segment display works and blinks. I think that it takes power from I2C pins. Does it create a problem in the upload?

 

Refik

 

 

 

 

 

From: address@hidden [mailto:address@hidden On Behalf Of Chris Gough
Sent: Monday, November 25, 2013 2:48 PM
To: Paparazzi UAV devel list
Subject: Re: [Paparazzi-devel] simultaneously using two autopilot systems for reliability

 

 

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