Update README.md
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@ -22,7 +22,7 @@ pin | function
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1 | +5V (250mA)
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2 | 0-5V TX (from heatpump)
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3 | 0-5V RX (to heatpump)
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4 | +12V (250mA)
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4 | NC (not connected)
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5 | GND
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## ESPHome example yaml code
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