problem with CDI Spark

good afternoon , first of introduce myself : name miguel 28 years of work in area 's ups , have done projects arduino 'm densenvolver programmable cdi 2 stroke engine , i'm part of firmware work , have problem can not solve , ask help, when let loose spark can read rpms communication port ; pulses become unstable , block , burned 2 arduino uno on doors communication , use avr chip , program drive symptoms same , output coil spark plug off no longer exists such problem , have photocouplers entrances , exits of arduinio ; condensers filter noise every time there spark problem presiste can not have more ideas of how resolve situation ; pulled sparkplug of isolating electronica metal still nothing .

any ideas?


thank greetings

this electrically noisy environment , in order electronics survive , work reliably here need protected against radiated , conducted electrical noise. wires carrying digital signals should shielded, wires connected vehicle electrical system should filtered, , microcontroller should installed in shielded enclosure shielded wires shielded to. pay particular attention filtering on power supply.

you haven't provided information current hardware , wiring have no way tell parts of have got right , areas may need attention.

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