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I used 187 without code modification (protocol ISO 9141).
+12V-------------------------------------------->9 Vbat
....................______...I--------------------->8 L
Pin 0 <-------I 1...8 I--I...I--1N4004 diode-->9 Vbat
Rx................I 2...7 I-----+--560R 0.5W--I
Pin <-100R--I 3...6 I----------------------+->4 K
+5V
Pin 1 <-------I 4...5 I------------------------>1 GND
Tx.................______ Si9243
Pin 0v <---------------------------------------->2 GND
GND
............dots is spacing..
I added 100R resistor and diode (1N4004) for protection.
Last edited by dar; 04-18-2011 at 02:20 PM..
Reason: Problem in the scheme's showing (with spacing)
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