Raymundo Magana
  • Male
  • Monterrey, Nuevo Leon
  • Mexico

Raymundo Magana's Friends

  • Guillermo Martinez
  • Mirac Aksugur
  • Pauli Seppinen
  • Guy McCaldin
  • William Premerlani

Raymundo Magana's Page

Profile Information

About Me:
M. Sc. in Automation and Control from Monterrey's Institute of Technology and Superior Studies.

Bachelor's degree in Mechatronics from Monterrey's Institute of Technology and Superior Studies.

Unmanned Vehicle enthusiast.

Raymundo Magana's Blog

New 65 Channel 10Hz GPS Receiver with Smart Antenna @ Sparkfun

Posted on April 6, 2010 at 10:15pm 31 Comments

A new 10Hz GPS is available on SF and it looks a lot more sturdy than the Venus module... Does anyone has it?


Comment Wall (1 comment)

At 3:23pm on April 30, 2010,
William Premerlani
Hi Raymundo,

Regarding your questions about A/D conversion in the UAV DevBoard (UDB), relating to your plans for using a dsPIC30F40XX.

1. We tie the digital and analog power supplies together on the UDB. We have not seen any noise problem as a result. I think that is because the board is small, with very short connections. There are many low ESR, 0.1 uF caps distributed around the board, at least 13 of them, and a couple of 10 uF caps, I think that helps.

2. With regard to the requirements for supplying the A/D inputs, you should read the Microchip documents to make sure you understand what is needed. In the case of the accelerometer connections in the UDB, there is a 0.1 uF capacitor for each accelerometer input, connected from the dsPIC A/D input to ground. Take a look at the accelerometer section of the UDB schematic, you will see it. It is part of an anti-aliasing, low pass filter, but it also plays an important role in supporting the signal while it is being sampled. You will need to do something similar.

Best regards,

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