Well, I am happy to say my orders from Aliexpress arrived yesterday with the small piezo buzzers and the light-dependent resistors. That's the good news. The bad news was that 13 out of the 20 buzzers were not working. At first I thought I had ordered the wrong type and that it needed more voltage, an AC power source or something. Then later I tried another one and it worked! (Albeit very quietly) I then tested the whole bag and only 7 of them worked. Disappointing. However, I did not pay much... but I did not like the failure rate.
Fortunately the LDR worked great so that can be worked in to the sensor board. I may have to change the compare resistance to capture the best value range on the analog input. I am going to use this formula
Pull-Down-Resistor = squareroot(Rmin * Rmax)
Where the Rmin and Rmax come from testing a few of the LDRs for Minimum and Maximum resistance.
So, I have order a new batch of buzzers from Aliexpress. Since it was hard to tell if I would get the same result (even from another vendor) I decided to try the big lot-cheap price strategy. So I ordered a lot of 100! This time it will run me about $8 but I think the shipping will be a little faster (China Air?). I can't imagine what I would do with 100 buzzers (especially if they all work).
Anyways, I have enough to start work on the new boards. The first will be a new sound board with pin selection and passthrough headers. The next should be a proper RGB board with a selectable blue pin. Fun!
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