Turtle Sense communications board v.0.25a

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Circuit Description for Turtle Sense v.0.25a

Turtle Sense v.0.25a is the Comm (communication) Board which connects to the remote Smart Sensor Board and to the piggybacked Phone Board. The Comm Board is powered from a separate battery pack of 8 AA rechargeable Eneloop batteries. The battery pack is about 11V fully charged and has a capacity of 2 amp-hours. The battery pack powers two power supplies on the board: (1) a 3.3V linear low power voltage regulator (U3) which powers the microprocessor (U1) and related circuitry on the board, and (2) a 5.0V switching voltage regulator (U4) which powers the Phone Board. The 3.3V regulator is on at all times, but the 5.0V regulator is only turned on when the phone board is needed, in order to conserve battery power.

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