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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.
@Gordon
Are you using an up to date firmware? The firmwares that came pre-installed on the Pucks didn't output quite as much power as the chip could manage.
Otherwise I think most likely you'd need to use an external transistor to increase the output power - which can get a little tricky with the two outputs. Probably an 'Opto-FET' like http://www.mouser.com/ds/2/408/TLP240D_datasheet_en_20171013-1075474.pdf would be a good easy option.