Hi, I'm looking to eventually build a musical instrument (similar to an accordion) using Teensy for sound synthesis and I'm figuring out which parts to use. Mono sound with 4-note polyphony would be sufficient, 8-note would be plenty. A few questions:
1) what's the best way to use a battery to power a Teensy (along with the speaker) and make recharging easy? I see that Adafruit has a Featherwing adapter board with a charging circuit for a LiPoly battery, but that seems to be for Teensy 3.x, and I'm not sure about the x? I guess a rechargeable USB battery would work, but are there other choices?
2) I'd like the sound to be played either through a speaker or through an headphone jack (not at the same time). It looks like the prop shield has an audio amplifier and the audio shield has an audio jack. What's a good way to get both?
3) I suspect that a Teensy 4.0 has more processing power than I need, but the price is as good or better than the 3.x boards. Is there any reason not to get it? Longer battery life with a lower-power processor, perhaps?
1) what's the best way to use a battery to power a Teensy (along with the speaker) and make recharging easy? I see that Adafruit has a Featherwing adapter board with a charging circuit for a LiPoly battery, but that seems to be for Teensy 3.x, and I'm not sure about the x? I guess a rechargeable USB battery would work, but are there other choices?
2) I'd like the sound to be played either through a speaker or through an headphone jack (not at the same time). It looks like the prop shield has an audio amplifier and the audio shield has an audio jack. What's a good way to get both?
3) I suspect that a Teensy 4.0 has more processing power than I need, but the price is as good or better than the 3.x boards. Is there any reason not to get it? Longer battery life with a lower-power processor, perhaps?