/diy/ - Do It Yourself

>>1703179

a 555 will do the job. look up the Astable formulas to determine resistor values at https://en.wikipedia.org/wiki/555_timer_IC
e.g.: t(high) = ln(2) x (R1+R2) x C

>>1703193
>>If so, it's a magnetic effect and other means are needed.
>what do you mean?

the energized coil creates a magnetic field which is capable of generating unwanted currents in the arduino. you'd need to neutralize those by moving the coil away (maybe by turning it upside down) or inserting a thick (2-3mm) bit of steel in between.