As all modules of this type it doesn't work "out of the box". You have to replace the capacitor (yellow) with the one with higher capacity (recommend 1000uF 6V). And of course feed the module with 3.7-4.2V (not 5V), as it doesn't have a power converter. To interact via UART TTL you also need a TTL level converter.
I have received my package but after I plug to my Arduino it’s not working . After plug it Nothing happen blinking led or heat up circuit or nothing happen please send me a another package or refund me my money . Thank you
I have received my package but after I plug to my Arduino it’s not working . After plug it Nothing happen blinking led or heat up circuit or nothing happen please send me a another package or refund me my money . Thank you