HK4100F-DC 5V-SHC Einkanal-Relaismodul 2,54 mm Stecker + 3p Steckerkabel
4,49 €
When in use, we can connect to the MCU with DuPont cable. We only need to stack the expansion board to the UNO R3 MCU, and use a 3P double-head XH2.54 plug wire (anti-reverse) to connect to the expansion board, which is simple and convenient.
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