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[Paparazzi-devel] Tiny 2.11 reset problem, solution

From: John Burt
Subject: [Paparazzi-devel] Tiny 2.11 reset problem, solution
Date: Mon, 13 Apr 2009 21:50:26 -0700
User-agent: Thunderbird (X11/20090319)

Like Paul Cox I have run into a resetting problem with my Tiny 2.11. The AP worked fine with my Easystar, with 4 small servos, but when flown in my multiplex Cularis with 6 servos it started resetting in flight (very scary!).

After doing some debugging, I discovered that in the Cularis my servos were drawing up to 2A, and adding the 9Xtend modem I was occasionally exceeding the 2.25A Tiny power supply limit. This causes the power to spike down to 0V, the AP resets and there is a brief loss of control and GPS fix. The AP then reboots, regains GPS and switches to HOLD mode (in my flight plan anyway).

The current solution, as Miles Johnson pointed out, is to power the servos (and RX in my case) off another higher capacity 5V converter. This seems to work OK for me, although I haven't flown yet with this fix.

However, since others may run into this, I'd suggest that the next Paparazzi circuit version include a higher capacity power supply (e.g., the TI PTR08060W 6A power module). Another reason to beef up the power supply is that some Paparazzi users may want to power other devices such as video cameras and transmitters.

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