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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.
@Sacha
Hi Gordon
Thanks for your answer. I tested it with two different types of relayboards:
https://www.aliexpress.com/item/Relay-module-for-arduino-uno/32400577838.html?spm=a2g0s.9042311.0.0.oem8mW
https://www.aliexpress.com/item/Free-shipping-10Pcs-5V-30A-1-Channel-Relay-Module-Optocoupler-H-L-Level-Triger/32691375337.html?traffic_analysisId=recommend_3035_null_null_null&scm=1007.13338.80878.000000000000000&pvid=6d6fabc7-6c62-4899-91c8-ea18cd519179&tpp=1
Sacha