in sim/dalboard.ts [8:17]
export function pinByName(name: string) {
let v = pinIds[name]
if (v == null) {
v = getConfig(getConfigKey("PIN_" + name))
}
let p = pxtcore.getPin(v)
if (!p)
console.error("missing pin: " + name + "(" + v + ")")
return p
}