How do I trigger multiple solenoids with a motion sensor?

Projects General Guidance
1

I would like to be able to have motion sensors that trigger the firing of solenoids, the greater proximity and movement the faster the firing.

I could use infrared or light sensors, which would be best??

The solenoids will be used to strike metal with rubber mallets, so I guess they will need to be a fairly powerful what voltage would you recommend??

what components will I need??

which resistors and which transistors should i use??

also advice on how to wire it.

any videos or information sources that could be recommended would be appreciated.

:slight_smile:

2

SOLBB:
I could use infrared or light sensors, which would be best??

Passive IR won't tell you distance or speed. A light sensor will give you some notion of speed but isn't good for telling distance. If you want to detect proximity, distance, and rate of approach I would recommend HC-SR04 ultrasonic range finders. They are available for less than $2 each.

SOLBB:
The solenoids will be used to strike metal with rubber mallets, so I guess they will need to be a fairly powerful what voltage would you recommend??

Old 12V PC power supplies are cheap and easy to get. If you can find a 12V solenoid that will do the job then I would recommend 12V.

SOLBB:
what components will I need??

Solenoids, power supply, logic-level MOSFETs to handle the current, and snubber diodes across the solenoids to protect the MOSFETs from inductive spikes.

SOLBB:
which resistors and which transistors should i use??

also advice on how to wire it.

220 Ohms from Arduino pin to Gate of the MOSFET. Solenoid connects from +12V to Drain of MOSFET. Source of MOSFET connects to 12V Ground and Arduino Ground.