Question: How can we adjust the volume of the coqui?

I'm not sure about this one... but maybe we could look on the web for "increasing amplitude of 555 circuit"?

http://www.learningaboutelectronics.com/Articles/Adjustable-square-wave-generator-circuit-with-a-555-timer.php

It seems to be saying you can increase amplitude with... increased voltage? so, maybe, try attaching a 9 volt battery? I warn you, i don't really know what I'm talking about so you may fry your circuit 🍞

that page does say that: Being that we are using a 555 timer chip, the maximum voltage that a 555 timer can withstand is 18V.

Changing volume can be done by adding a potentiometer into the loop. Here is an easy description of how http://www.learningaboutelectronics.com/Articles/How-to-vary-the-volume-of-a-buzzer

Thanks @warren and @roberts_ecofarm! This information is really helpful, and gives a way forward. I will dig through my boxes of extra parts and find a potentiometer, maybe also a battery case for a 9v battery, then remake this circuit. I'll write in with how it goes.

Also if you have a resistor you could test the idea bc a potentiometer is an adjustable resistor, if that's helpful. 

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Thanks @warren and @roberts_ecofarm! This information is really helpful, and gives a way forward. I will dig through my boxes of extra parts and find a potentiometer, maybe also a battery case for a 9v battery, then remake this circuit. I'll write in with how it goes.

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Hi @Liz! A potentiometer just before the probe changes tone. And, for a higher volume you can substitute the piezo speaker with a minijack connector and plug the hole thing to a big speaker:

Adding jack https://publiclab.org/notes/imvec/06-08-2018/adding-a-jack-to-the-coqui

Recording using audacity https://publiclab.org/notes/imvec/06-09-2018/coqui-wave-audio-recording https://publiclab.org/notes/imvec/06-11-2018/analizing-the-signal-of-the-coqui-using-audacity

I also found recently that a more powerful battery makes it louder, which i guess i could've figured out from the comments above (lol) but, just to say simply, use a 9v battery for louder sound! 😆 📢