If you can, run the amp power and ground directly from the battery or whatever supply you have and put a bunch of filter caps on it. Also be careful to use a single point ground...multiple ground wires to one point, not a single wire daisy-chaining from place to place. Although I suspect some noise will be inevitable given the shared supplies on-board.
MS [EMAIL PROTECTED] wrote:
Hi All, I am connecting an I2C device attached to the bus lines and also an amplifier whose output is fed into ADC0 on the TMOTE sky. However, I noticed that there is some noise on the amplifier output that arises whenever the I2C lines are connected. This noise seems to correspond to the radio communication (I supposed since radio is multiplexed with I2C lines). And the noise dissapears when the I2C lines are disconnected (I2C lines have 2.2k pull-up resistors). Since only the analog ground is available on the header, all the grounds are tied to it (is there another option? e.g., soldering wire to gain access to digital ground). The amplifier is powered via the Analog VCC and Analog GND on the TMOTE header. Any ideas? Any suggestions are greatly appreciated. Thanks, Neschae _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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