mechanical and electronics done, no software yet.

also: old lipo=dead. old lead accu=dead. bought a new 12V 4800Ah 2.6A current lead accu. works.

the solenoids:

spraycans mounted

test firing made a mess on my bench

the (simple) electronics: mosfet, opto coupler, 2 resistors, 1 protection diode per solenoid. see fritzing sketch for compontent list.