Unfortunately I forgot this crucial aspect and connected modules RX / TX straight to Arduino pins
Note: TX and RX are LVTTL, meaning 3.3V signals. While I have tested the module extensively directly using the 5V TTL signals (Arduino for example) with no problems, I cannot promise that damage will never occur, and it is therefore recommended to use transistors to interface with a 5V TTL signal.
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via Egeo 16