Driving multiple Solid State Relay

Projects General Guidance
1

Hello,

I have a couple Solid State Relay ( KSD210AC8 http://www.cosmo-ic.com/object/products/KSD210AC8.pdf) and I would like to drive them from an Arduino. Since they only use around 7.7 mAmp @ 5v could I simply use a digital out pin or would I still need some kind of transistor?

Thanks

2

SSRs work just fine right from the arduino. Some don't do pwm tho just something to keep in mind.

3

Yes, direct control from on arduino output pin will work. And yes, it will not do PWM output, just on and off control.

4

There are some DC SSRs that do work with pwm like the power-io HDD-xxxxx SSRs but you will only find that in DC

5

drksam:
There are some DC SSRs that do work with pwm like the power-io HDD-xxxxx SSRs but you will only find that in DC

There are some AC SSRs that can do some form of slower PWM often called phase controlled. However the PWM switching speed must be at the line frequency speed not the higher speed that the arduino PWM uses, and one must have a external means of detecting the AC zero crossing for proper timing.

Standard AC SSR only turn on and off it's output at AC zero crossing (8.33 msec @ 60 Hz) where as the 'phase controlled' AC SSRs allows turning on the device at any time in the AC waveform, but can only turn off the SSR at zero crossing like the standard ones.

6

Isn't it best then to us a triac to dim/slow AC loads. Still with zero cross of course.