[AR] Re: NO-fire, SURE-fire ignition standards ?

  • From: Peter Fairbrother <peter@xxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Wed, 6 Jan 2021 01:16:55 +0000

On 05/01/2021 21:00, Dr Edward Jones wrote:
[...]

What's common practice with small battery ignition, even with a relay?

4 x AA, fresh Energiser or Duracell preferred.

Maybe 6 x AA if you are igniting up to four ematches at once over a distance with diodes in circuit. Chap I know recommends 3+n AA, where n is the number of ematches.

2x18650 is overkill if you want to go rechargeable.

This is mostly for firework displays where I'll fire maybe 30-100 ematches in 20 minutes.

Smaller cells will work too, in fact a single AA will fire an ematch. I just tried. :)



Peter Fairbrother

My main box has 4xAA to run the arduino and 6xAA for the matches. 36 relays, the unpowered breakout boxes have 3A diodes for the matrix. Maximum firing wires would be 50m long, though 20m is more usual max. I seldom fire more than 2 ematches at once but it is built for firing up to 4 (and I could easily add more AAs if needed).

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