On a different notice: measure the resistance across bothth jack connectors and spiral phone cable... may be there is something fishy... or went somehow wrong when working / crimping on it.
Sometimes it is a simple electro-mechanical issue... like forgetting to put the plug into the wall outlet... ;-)
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.
On a different notice: measure the resistance across bothth jack connectors and spiral phone cable... may be there is something fishy... or went somehow wrong when working / crimping on it.
Sometimes it is a simple electro-mechanical issue... like forgetting to put the plug into the wall outlet... ;-)