ATTiny85 chips are cheap (£1.50), add a transistor and it's less than £2.Popopo wrote: ↑Mon Dec 11, 2023 5:49 pmHum...stephen_usher wrote: ↑Mon Dec 11, 2023 11:40 am All you need is an ATTiny85 and a way to switch its power on and off using an output from the Pico. In the case of the vDrive I used the activity LED power to switch a transistor. The speaker is directly connected to two of the pins on the ATTiny85.
not so simple as I thought.
I think, Noel Llopis did something similar in the place of a LED, need to check it out.
Don't know... how much cost the ATTiny and other components... but remember, I have not vDrive.
So any solution must be independent of 3rd parties solutions
Here's the schematic:
Replace "LED" with an output from the Pico and Bob's your uncle.