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Zipit Bluetooth Serial mod. Steve Adolph

Zipit Bluetooth Serial mod. Steve Adolph. Goal: Enable portable internet connectivity for a Tandy 200 using a Zipit Z2 Tandy200 RS-232 bluetooth  Zipit Z2  internet Approach: Add internal bluetooth serial adapter to the Zipit Z2 Use RN-42 from Sparkfun: enables serial over bluetooth

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Zipit Bluetooth Serial mod. Steve Adolph

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  1. Zipit Bluetooth Serial mod.Steve Adolph Goal: Enable portable internet connectivity for a Tandy 200 using a Zipit Z2 Tandy200 RS-232 bluetooth  Zipit Z2  internet Approach: Add internal bluetooth serial adapter to the Zipit Z2 • Use RN-42 from Sparkfun: enables serial over bluetooth • Tandy 200 has a matching bluetooth adapter • Minimal impact on look/feel of Zipit

  2. Internal Connections RN-42: RS-232 + flow control • TxD, RxD, RTS, CTS, +3.3V, GND Zipit Z2: ttyS1 is assigned to the “BT” serial port • 3 signals on edge connector, 1 on PCB (backside of Z2 LCD screen) top _________________________________________ | 36-pin connector . | ---------|_________________________________________|------- DC [O] |||||||||||||||||| |||||||||||||||||| bottom 36 19 18 1 (ext. +5VDC) Connector Pin # Connected To Function Use ------------------------------------------------------------------ 31 CPU C17 GPIO (45) BTRTS 36 CPU A20 GPIO (44) BTCTS 7 CPU D20 GPIO (42) BTRXD - CPU B21 GPIO (43) BTTXD (connect at smd pad on board)

  3. Serial port connections CTS RTS RxD TxD

  4. Wired up 3.3V

  5. RN-42 placement

  6. Comments • RN-42 fits snugly in the lcd cover, and there is no height problem. • I notched the foam to make room for RN-42, ad the wires. • Soldering was very tricky. I used a microscope and a third hand vice. • Adding LEDs for status would be a possible also.

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