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Re: [Paparazzi-devel] I2C port and Pull-Up Resistors for YAPA2

From: GalapagosUAV
Subject: Re: [Paparazzi-devel] I2C port and Pull-Up Resistors for YAPA2
Date: Fri, 14 Jun 2013 16:31:57 -0500

Hello Helge,

Thank you so much for your help. I got the Airspeed sensor working using external Pull-Up resistors (4.7k each). However, I still can't get any readings from it. I configured my airframe file as instructed in the wiki  for airspeed measurement only and get the readings on the log file with no results.

I tried blowing directly into the sensor and I get airspeed readings on the sensor led but I don't get anything on the paparazzi log file. Do I need a continuous airspeed to get readings on the Paparazzi log file?


Sent from my iPad

On 14/06/2013, at 13:10, Helge Walle <address@hidden> wrote:

According to the manual the ETS Airspeed sensor needs external pullups. From the schematics it seems the YAPA has 10k pullups.
In my working setup (with TWOG which have 10k resistors) I also have the 4.7k pullups provided on the Sparkfun IMU board.

So the total resistance on the SDA and SCL lines are10k in parallell with 4.7k, which is working with my TWOG.
2013/6/14 GalapagosUAV <address@hidden>
Hello everyone,

I'm trying to connect an Eagle Tree Airspeed sensor to the I2C port of my YAPA2 and I would like to make sure if I need to connect the Pull-Up Resistors in order for the bus to work ( What are the recommended values for this resistors?

Best Regards,

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