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Summary of change:
An interesting failure mode of the (motor of the) compressor(s), if automatically started with the usual pressure-circuit: * if there is a '''short (eg. 1..3 seconds) power outage somewhat before the compressor would auto-OFF''' (pressure switch is still ON) ** the '''electric motor can''' (actually likely) '''burn'''. Very annoying, especially if multiple compressors are started from same pressure switch (which is not uncommon) This is not a problem if the power outage is longer (say, 10 sec, enough time for relief from the small tube) * or if power outage is short, but pressure switch is OFF (obviously) '''Solutions:''' * '''delayed startup''' ** either manual start, with simple self-holding relay circuit (so it's OFF right after power outage) ** or some electronic or processor delay (like arduino). With RTC (or better: network connection via NRF24L01 radio or serial link - possibly via BT or wifi adapter) can be programmed so it's off at night, or weekends ** maybe an USB-serial adapter in a TP-Link (openwrt) router (also useful as fileserver and printerserver) would be suitable to control the relay (TX, or the RTS signal can be switched from software); Requires some software (perhaps as in OverTCPWireless just a ser2net autostarted after boot?) the relay-control HW would be trivial (and stateless) this way. 5V relay (eg. 230V, 10A) might be useful (usually a small PNP inside, activated by pulling input to GND)
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