Nice looking board, but I agree, you should charge more. One market to consider is automotive scopes- since it already can interface with a phone, putting different connectors on there and with a case would suffice for most uses. Compare to a Pico scope for the market leader in this segment. It definitely doesn't need to be a 100% finished consumer product (that's already covered), you wouldn't be selling to hackers but the mechanics who use a scope are by and large the technically sophisticated ones. Just a thought, it looks like a great product, I'm buying one just to hack into a portable scope so I don't have to deal with getting out my rigol for basic auto work.
Edit: it certainly doesn't need to be battery powered either, conveniently cars have 12v battery power avaliable (although it is quite dirty, so input protection is required). I'm on my phone RN, otherwise I'd pull up the schematics, it might already have adequate input protection.
Honestly, I designed it when I was a student because there was nothing usable at the low-end of the market.
While I could possibly charge a little bit more for it, I don't think the specs justify a $50+ price point (as-is), and for a lot of people that extra $20 makes a big difference.
There were some thoughts a while back of making a higher-end product to fill the $50-$80 gap, and possibly even a stripped down Labrador to sell around the $20 mark. Looking at the Amazon charts, a lot of people are buying knockoff DSO138s to save literally $5-$10 and are left with a really poor quality product.
Have you considered a bundle that includes a case? I don't do a lot of maker/tinkering stuff so having the chip loose or on a breadboard wouldn't work for me in most situations. But I do sometimes have a need for an oscilloscope or multimeter, and would gladly pay ~$50 for one that had a case and some basic/standard connections, especially if it's supported by open software like yours.
This looks great! I'm going to buy one because of the price point (I wouldn't at $50, but maybe plenty of others would).
Is this useful for a hobbyist? Everyone I've talked to said "get a proper oscilloscope, anything less is a toy" but I have neither the space nor the need for an oscilloscope. I have a Saleae Logic analyzer, but yours looks more featureful.
Edit: it certainly doesn't need to be battery powered either, conveniently cars have 12v battery power avaliable (although it is quite dirty, so input protection is required). I'm on my phone RN, otherwise I'd pull up the schematics, it might already have adequate input protection.