would be to hook up a logic state analyzer
Even just sticking LEDs on the 2 pins (so they are normally off) would let you check whether you had the right ones.
@Gordon started
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.
Even just sticking LEDs on the 2 pins (so they are normally off) would let you check whether you had the right ones.