Hi, where do u solder the switches in this circuit?
Everything (the 2 Arduinos and the SFX board) has a common hot and ground; the switch under the ion arm is inline with the hot lead coming from the battery pack.
i meant for firing. i eventually realized where to put the main switch but for the firing trigger that causes the sound to cue and the LEDs to spin rapidly.
Ah, ok - I don’t have my wand connected electronically to the pack. It’s a Spengler and I don’t want to mod it 
The circuit this build is based on doesn’t have provisions for adding a wand.