GRuser:
As already told,
you must first decide how do you judge "this controller failed"
then, how do you output a "failed status" for each controllerwhen you publish these info, you will have an appropriate help
the rest is easy
Judgment: For ex : The battery of the Arduino is dead. So there won't be any signal at the output. But PIC is working or vice versa. Of course system won't be able to work if both batteries are dead (But probability of this event happenning is %0.35)
gunesmadrali:
Judgment: For ex : The battery of the Arduino is dead. So there won't be any signal at the output. But PIC is working or vice versa. Of course system won't be able to work if both batteries are dead (But probability of this event happenning is %0.35)
What about the time period when the Arduino has weak power but is in the reset condition because of the brown out detection? You may need pull down resistors for example, to ensure that your detection circuit actually sees a low logic level.
aarg:
What about the time period when the Arduino has weak power but is in the reset condition because of the brown out detection? You may need pull down resistors for example, to ensure that your detection circuit actually sees a low logic level.
And communication with PIC
If arduino cant supply a power PIC must understand it. WOW thank you I think I solved it. Arduino will be in communication with PIC . If pins of Arduino doesn't working PIC will move in.
UART Communication system that I must use
You say you will use an arduino and/or a pic for avionics/parachute deployment !!!
And you come to a forum asking for help?
(OMG, why am I wasting my time...)
GRuser:
You say you will use an arduino and/or a pic for avionics/parachute deployment !!!
And you come to a forum asking for help?(OMG, why am I wasting my time...)
I guess you are ignorant about this.
1-This is not a real rocket (I think you thought this rocket will send to Space hahahahahahahaah)
2-There are so many water Rocket projects in the internet with Arduino
3- I don't want to learn your thoughts about project I just request an information if you don't know you don't have to answer
https://create.arduino.cc/projecthub/UniverseRobotics/rocket-parachute-ejection-system-7cf129
there are a lot of sites on the internet about this topic that are similar to the links I have posted
I hope this links will help you
Have a great day mister 
How exactly were we suppose to know this had anything to do with a rocket? It was not until halfway through the discussion that you mentioned avionics, the later parachutes, with no explanation of the specific application. Noone here is a mind reader.
Just how large is this rocket going to be? Servos large enough to require an SSR to drive them implied that this was something very big, on the scale of at least a small manned aircraft. Noone uses SSRs to drive hobby servos.
david_2018:
How exactly were we suppose to know this had anything to do with a rocket? It was not until halfway through the discussion that you mentioned avionics, the later parachutes, with no explanation of the specific application. Noone here is a mind reader.
Parachute Ejection System, potato peeling machine, timed seed sowing system,special door mechanism or many systems. You can manage many systems with this. I don't have to specify it.What would be happen if I say I will use this system for potato peeling machine..?
Come on guys , you know it. The algorithm may change according to what you want to create.
I just asked you how the Servo and the OR gate in the system would react when the energy reach to the pins.
An engineer should think simple when necessary, think complex when necessary. I just asked you to think simple. ,
And thank you I got the required answer and I successfully tested the system. The system is working without any problem. (I changed motor.)
JCA34F:
If the Arduino and PIC grounds are tied together, just use a 2 diode "OR" on each SSR channel.
Thanks it worked
gunesmadrali:
An engineer should think simple when necessary, think complex when necessary. I just asked you to think simple.
Most people who come here for help are not engineers, and we have no way of knowing whether they are or not. Frequently people will "pump up" or "massage" the question to make themselves sound less ignorant, and so it is nearly impossible to answer a question in a completely generic way, unless all the details are presented. It is not uncommon at all, for people to ask for help to assist with a solution that is completely inappropriate. That is why the forum guidelines suggest completely revealing both the problem and the context.
aarg:
Most people who come here for help are not engineers, and we have no way of knowing whether they are or not. Frequently people will "pump up" or "massage" the question to make themselves sound less ignorant, and so it is nearly impossible to answer a question in a completely generic way, unless all the details are presented. It is not uncommon at all, for people to ask for help to assist with a solution that is completely inappropriate. That is why the forum guidelines suggest completely revealing both the problem and the context.
I think the question I asked is quite clear that I got the answer I wanted. Thank you for criticizing me. But I am not the type of person you define. Thank you for helping me solve the problem in the diagram.
For that I must use 2 microprocessors that will guarantee the system. (I need to trigger SSR's at right time for parachute deployment system)
TBH, a safety system will need double the hardware, not just the CPU's i think. I would want 2 latches with 2 servo's per operation (definitely if you're building it !) But outside of that, it would clearly simplify matters if instead of a PIC and an Arduino, you could deal with 2 units of the same type. Since this is the Arduino forum let's assume 2 Arduino's (or two PIC's or 2 ATtinys those things are a bit more rugged you know)
Ok, the basic idea is that you have one primary system and 1 secondary, as long as the primary system is functioning (and the secondary system is checking on that of course, probably easiest through Serial comm.
The main issue is that, sure the secondary system can switch a gate so the primary system does no longer interfere, but also you primary system must be able to disable that interference if the secondary system fails.
So that can all be done, a few pins, some NOR & / || NAND gates, a couple of pins per unit dedicated, and just hope that if a unit fails not all pins behave exactly the wrong way, but then still, what is the rest fails ? the power to the gates or to the Servos ? What you really want is something manual, like a ring on the pin of the hinges that you can pull and all drops out when you need it.
Deva_Rishi:
TBH, a safety system will need double the hardware, not just the CPU's i think. I would want 2 latches with 2 servo's per operation (definitely if you're building it !) But outside of that, it would clearly simplify matters if instead of a PIC and an Arduino, you could deal with 2 units of the same type. Since this is the Arduino forum let's assume 2 Arduino's (or two PIC's or 2 ATtinys those things are a bit more rugged you know)
Ok, the basic idea is that you have one primary system and 1 secondary, as long as the primary system is functioning (and the secondary system is checking on that of course, probably easiest through Serial comm.
The main issue is that, sure the secondary system can switch a gate so the primary system does no longer interfere, but also you primary system must be able to disable that interference if the secondary system fails.
So that can all be done, a few pins, some NOR & / || NAND gates, a couple of pins per unit dedicated, and just hope that if a unit fails not all pins behave exactly the wrong way, but then still, what is the rest fails ? the power to the gates or to the Servos ? What you really want is something manual, like a ring on the pin of the hinges that you can pull and all drops out when you need it.
You re right I changed servo's because of the manual operation and behave of the SSR. And I communicated each other. When Arduino works PIC won't be able to work. Consequently I assigned the pic as second system.Thank you so much for your advice. I have configured the system