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'''Jonas Olhssons BMW 1602''' http://www.vems.hu/files/MembersPage/MattiasSandgren/BmwJonasMtenTurbo/jonas_blackrace_20040703.jpg ---- '''Engine specification''' * BMW M10, 2.0 litre crank, stock rods and Mahle forged pistons * Schrick cam shaft (300+ degrees duration) * Individual Throttle Bodies * Ford Motorsport 1600 cc fuel injectors, 5 Ohm impedance * BMW Coil-on-Plug from S38 engine (coils mounted on firewall) * Simple type, Honeywell GT1 Hall-sensor on crank and cam ---- ''Q'': Can the Genboard v3.4 support ''two'' Honeywell GT1 sensors (fed from pin 28 +5V) ? * you experienced voltage falling below +4.5V ? Typical 10mA (max 20mA) x 2 should be handled by output without voltage falling under 4.8V ** In fact Emil Larsson wired 2 sensors (on the alfa romeo V6) on pin 28 using a v3.3 board, worked properly, Used a soldered junction in engine bay. ** are you sure using EC36pin28 ? '''stay away from pin 29 ! ''' ** what is the measured current draw of your honey ? [http://www.elfa.se/pdf/73/734/07349038.pdf Data sheet here] ''Q'': Can they be wired to +12V (same fuse as the Genboard) with no ill effects? * The datasheet allows this ** The +12V can have spikes (related to alternator charge-control, and/or starting aid). It might be a good idea to have [http://shop.vems.hu/catalog/product_info.php?cPath=1_15&products_id=93 18V throughole transient diode] in the wiring to protect the sensor. ** or WebShop can give you small mapboard (sensors, 400kPa MAP sensors) "bare pack" with 5V regulator installed (with caps, and transient diodes) that protects the sensor from transients ''Q'': In addition to the two Hall sensors we will be using three switches with 2.7 KOhm resistors as pull-ups to EC36-pin28 according to MembersPage/PhatBob/UserGuide. That's 2 mA per switch if all are active and a theoretical max of 50 mA current draw from the switches and Hall sensors. Is there anything to worry about in using EC36-pin28 for all these purposes?
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