Drive 4 triacs with a PIC which is drive by an accelerometer

[electronicman]

Hi I need some help,
I want to transform in my circuit a double inverter relay in an electronic control.
The only way I've found, is 4 triacs (one in each path of the relay) which their trigger is controlled by a microcontroller.
The circuit is driven by reaction of an accelerometer which inform the chip which stop 2 of the triacs and in the same time supplies the others.
The problem is that I need 35mA in each trigger of the triacs and the maximum we should take from the output of a PIC is 5mA and the supply is a battery of 5V.
The second problem is the triacs,are they really reliable if i need a fast answer when i cut the trigger current?

 

[topquark]

Not sure what you're trying to do there but you'd feed the triacs via a transistor to switch in a higher current. The triac is for an ac load though, what is the accelerometer controlling?

 

[electronicman]

thanks for the fast answer
the accelerometer is a security which is initiate when the tool move too fast.

I was thinking about the supply 70ma for my 5V battery i don't know if it's a good idea...
and are the triac fast for my use? that will be the first time i'll use one .

 

[topquark]

I think we'd need a better understanding of what load you are trying to control to help with much of the detail. How is your load controlled and why have you chosen a triac as the device to do it?

Assuming the triac choice is for good reason you'd need to take the output of a transistor (emittor around 5V peak) via a resistor (say around 140Ohms) to give you the driving current for your triac. If you've chosen components it would help to list them, however I should say this is an electricians forum, not really for electronics.

 

[electronicman]

yes i have seen a bit late after my registration that it's just electric here.
All the pic and the accelerometer will be supplied by a battery and the load that the triac have to stop is an universal motor so an inductive load.

 

[topquark]

You may be better trying somewhere like here: Forum for Electronics It appears to cover the areas you're interested in.

I think you may want to consider whether a battery supply for a control circuit is a good thing as well. One of the fundamentals of control theory is a reliable supply.

 

[Geordie Spark]

Hi I need some help,
I want to transform in my circuit a double inverter relay in an electronic control.
The only way I've found, is 4 triacs (one in each path of the relay) which their trigger is controlled by a microcontroller.
The circuit is driven by reaction of an accelerometer which inform the chip which stop 2 of the triacs and in the same time supplies the others.
The problem is that I need 35mA in each trigger of the triacs and the maximum we should take from the output of a PIC is 5mA and the supply is a battery of 5V.
The second problem is the triacs,are they really reliable if i need a fast answer when i cut the trigger current?

Dear God man !!!!

Some of us here are struggling to measure Ze with a Metrel 61557 Installtest multifunction tester and you come along & ask questions like this ???

 

[Knobhead]

If this is in any part a safety system be very careful. The HSE don’t take to kindly to home made gear when it fails. The idea of a battery is a No No.