I am pretty novice at the moment when it comes to circuit design. I can follow a layout and can solder pretty well, but I have a lot to learn when it comes to circuit design. With that being said, I want to start a fun project that I will take in sections/steps to understand and learn as I go. The end goal will be to design a circuit to perform relay or MOSFET (have not decided yet) sequencing with some added features. This is intended to be a long term (over the next 3 or 4 months) project. Below I will describe the requirements of the sequencer and a couple of links to items I found on this forum. Then over the next 3 to 4 months I would like to work toward that end goal as I do little projects along the way to learn how this all works. Your expertise will help immensely to get to the end goal.
My intentions will be to use this as a sequencer for igniting fireworks, but I am sure it could be used for other things as well. In the end I will share the finished circuit design with the fireworks community in the hopes of it being a low cost sequencer that people can build if they so desire.
With all that being said, let's get to the details:
Fireworks Sequencer
http://forum.allaboutcircuits.com/showthread.php?t=53616
Sequencer for Fireworks
http://forum.allaboutcircuits.com/showthread.php?t=42085
A couple of attachments from those threads:
http://forum.allaboutcircuits.com/attachment.php?attachmentid=5816&d=1228883204
http://forum.allaboutcircuits.com/attachment.php?attachmentid=22900&d=1285261840
If anyone is up for riding along on this project, I would most appreciate your input. I would like to start slow and come up with parts of the circuit at a time that I can breadboard and understand how they function. As we go, the circuit can grow in complexity to meet the specs that are needed.
Thank you,
Kyle
My intentions will be to use this as a sequencer for igniting fireworks, but I am sure it could be used for other things as well. In the end I will share the finished circuit design with the fireworks community in the hopes of it being a low cost sequencer that people can build if they so desire.
With all that being said, let's get to the details:
- The circuit will need to be able to be powered from 12V to 24V.
- The circuit will need a key switch for arm and safe modes.
- There will need to be 24 total outputs and will all fire in sequence.
- The outputs will be grouped in sets (either 4 groups of 6 or 6 groups of 4)
- Each group of outputs will have a 6 position selector switch to select the timing of each group (0.5s, 1s, 2s, 3s, 4s, 5s).
- The sequence will need to be initiated when an input of 12V to 24V is received.
- After the 24th output is energized, 1 additional output would energize that could be used to start the sequence on another module (daisy chaining).
- Output will need to be able to produce up to 3A at 18V.
- A test mode will be required with an LED at each cue that sends a maximum of 30mA through the igniters to check continuity.
- Need to have circuit protection.
- Finally (at least that I can think of right now), it will need to be able to delay for 5 seconds when it is armed to prevent inadvertent start of the sequence.
Fireworks Sequencer
http://forum.allaboutcircuits.com/showthread.php?t=53616
Sequencer for Fireworks
http://forum.allaboutcircuits.com/showthread.php?t=42085
A couple of attachments from those threads:
http://forum.allaboutcircuits.com/attachment.php?attachmentid=5816&d=1228883204
http://forum.allaboutcircuits.com/attachment.php?attachmentid=22900&d=1285261840
If anyone is up for riding along on this project, I would most appreciate your input. I would like to start slow and come up with parts of the circuit at a time that I can breadboard and understand how they function. As we go, the circuit can grow in complexity to meet the specs that are needed.
Thank you,
Kyle
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