Update README.md

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@ -54,6 +54,7 @@ We support a variety of implementation choices of hardware (we call it platform)
- Constant resistors, for transistor/relay (to Raspberry Pi) 220Ohm-1kOhm, those from ATX to relay need to be matched for your motherboard (supposedly 330-470 Ohm)
**ATTENTION!** Don't use random relay modules or random optocouplers. Some relays or optocouplers may not be sensitive enough for the Raspberry Pi, some others may be low-level controlled. Either use relays that are controlled by a high level, or follow the scheme and buy an OMRON. See details: https://github.com/pikvm/pikvm/issues/13
<img src="no_relays.png" alt="drawing" width="200"/>
# Setting up the hardware