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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrAzzy
In english, you only need the ? at the end of the question.
12v is within spec for both Espruino boards.
On the Pico, put +12v on the BAT_IN pin.
On the classic Espruino board, put it on the positive side of the battery connector (or onto VBat - this is okay since you're powering with >5v)'
Yes, you could use the same power supply for the Espruino and the LED strip, and either relays or MOSFETs to turn it on and off (I sell suitable MOSFET drivers in my tindie shop - https://www.tindie.com/products/DrAzzy/simple-sot-23-mosfet-six-pack-loaded/ or https://www.tindie.com/products/DrAzzy/4-channel-mosfet-board-20a-20v-25v-gate/ depending on how much current you need ). The advantage of MOSFETs is that you can use PWM to dim the LEDs, while a relay can't be turned on and off fast enough.