One step forward, one step back, and maybe a step or two to the side.
No, we’re not dancing. I’m describing the power for the V3. With BronyCon approaching faster than I’d like – 9 weeks away from now – I can’t really take too much time to re-design things. I tried two things: One, a separate power supply board, and Two, using a single buck/boost regulator.
Neither of those are going to happen.
The separate power supply board is simply too expensive to start off with. If I was getting 500 of them, that wouldn’t be an issue, but with a production run of around 100 units, it’s about 3x more expensive than it should be. That said, an updated V3, when I have the opportunities to purchase in larger quantities, may feature a separate power supply board. Additionally, such a power supply board would be available separately for whatever sort of crazy contraptions you can think up. I AM going to be integrating most of the power supply board’s design into the V3 – That is, the ATTiny84 for control and additional GPIO and battery monitoring.
The voltage regulators, on the other hand, are going back to the ones that have been tested and I know work. The single buck/boost one I simply could not get functioning. If that was an issue with the soldering, or board design, or something else, I don’t know – And I don’t really have the time to figure that out. Both of the other regulators I have tested and work fine. Thankfully, there isn’t much of a price difference, it’s just a matter of squeezing them onto the board. Which I’ve already done.
In other news, it seems unlikely that there will be a case ready for BronyCon. While I really hope this next design will be the one I get a fully functioning prototype out of, I’ve said that for the other ones, too. I’ll be honest – There is entirely a possibility that the V3 will not be ready before BronyCon. I really doubt that will happen – Especially with having someone else manufacture them – but it IS possible that things just don’t work out. That said, there’s still about six weeks to work with, so I’m not terribly worried yet. I’ve already placed an order for more prototypes, so right now I’m just waiting for them.