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Summary of change:
'''trigger preparations for v3.1''' While v2.2 was running the engine (fuel only), we took a PC scope and a v3.1 (with Alubos and lotsof wires) to check the signals from the distributor. The signals were as we thought: * GND * 12V * 5V trigger for every event (4 camtooth: coil-type if you like) * 5V trigger 1 per engine cycle (1 camtooth) [http://www.vems.hu/files/Fero/Mazda_cam_trigger.JPG a scope snapshot] notes: * 1/10 probe was used, so grid is 1V (not 0.1V) * the scope captured the very last tooth for the yellow signal (the 1 camtooth HALLsignal) when the probe was disconnected. The 4 tooth signal continued for a while. During normal operation the frequency of the green was exactly 4* times that of yellow. On the picture, green duty is about (12msec / 32 msec) When RPM was about 1500, * the green duty was 7.5 msec and period 20 msec * the yellow period was 80 msec We attached the v3.1 LM1815 input (through a 10uF 35V 1210 cap, that was on its place on the bottom side of board) to the 4-tooth signal, and read the correct RPM value (after enabling the primary_trigger).
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