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Showing some Teensy love, crazy the 4.0 has 600MHz base speed.

Is that a Cortex-M7 or something?

Yeah that's what it says. I like it because it has so many connection pins eg. i2c/can be lazy.

I have STM32 and Beaglebone too but have not used them yet.

Teensy is great, but that puts you in the $20 range and doesn't have WiFi.

In my case I just use an ESP01 to add WiFi.

I forgot to mention, blinky demo compilation take 60s on my PC, that's the only downside but maybe there are some workarounds.

And can use up to 8mb of psram and 16mb of flash

also can interface to sd cards easily for gigabytes of mass storage