I don't think so. I want complete control of when cues are fired. Will a sequencer fire the cues in a fixed succession? With a fixed time interval between each fire?
Sorry, didn't read what I wrote before I sent it. In the original concept each push button would be replaced by a MOSFET. Source would be common ground, drain would be +12v and gate would be from uC output pin. Is this feasible?
Also, would it be feasible to have a 10x10 grid with each row controlled by a MOSFET and each column controlled by a MOSFET?
Sorry, didn't read what I wrote before I sent it. In the original concept each push button would be replaced by a MOSFET. Source would be common ground, drain would be +12v and gate would be from uC output pin. Is this feasible?
Also, would it be feasible to have a 10x10 grid with each row controlled by a MOSFET and each column controlled by a MOSFET?
This is an over-simplified circuit for a fireworks igniter. The objective is to signal the ignition of many individual cues while limiting the number of parts and wires.
In general, is arranging mosfets in this manner a good solution? If it is, then I will work on the details of it.
Each of the diagonally oriented resistors is a what fires a cue. Its a segment of nichrome wire that will burn red hot then burn out creating an open circuit. It takes about 1 amp. The wires from the mosfet to the cue would be 100-200ft long.
I realize the dangers involved with fireworks and any device used will incorporate safety features according to NFPA code.
The firing of the cues will be programmed into the uC, if that's what you mean. LEDs are used to indicate continuity. There is generally a 'test' mode and a 'fire' mode. The test mode limits current to 10-15mA. I would probably use a physical switch to switch between the two.
John:
You can always reference the post number or right click the schematic or the post # and get the link location and you can post that. There are ways to make the link appear as "New schematic" in blue e.g. **broken link removed**
The way to do this is:[url = https://www.electro-tech-online.com/attachments/]New schematic[/url]
The differences of a regular URL are shown in bold. The = sign is supposed to be bold.
The matrix of FETs looks ok in principle, but you will need to consider what safety features to add to prevent spurious triggering, e.g. by static build-up or induced voltages.
John:
You can always reference the post number or right click the schematic or the post # and get the link location and you can post that. There are ways to make the link appear as "New schematic" in blue e.g. **broken link removed**
The way to do this is:[url = https://www.electro-tech-online.com/attachments/]New schematic[/url]
The differences of a regular URL are shown in bold. The = sign is supposed to be bold.
Are they any components you can recommend? My understanding is that induced voltages would be from something such as a coil or motor and a diode is used to prevent the 'back spike' (I don't know the proper term). Should I add these just to have that extra safety measure? How do I make sure static build-up is not an issue? Is having it properly grounded to most effective method?
MOSFETs are referred to as N-channel and P-channel (your schematic shows those correctly).
If you are using both 5V and 12V components you will have to interface those correctly.
I'm concerned that your electronics knowledge may not be enough to build this project to a high safety standard. I have no practical experience of pyrotechnics so regret I am unable to advise on the safety aspects; you should get advice from someone who has the right background and knowledge.