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Homeroasters - Home Roasting Coffee Community » DATALOGGERS - CONTROLLERS - RATE OF RISE METERS » Dataloggers/Controllers/Rate of Rise Meters

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Signal cable lengths to / fro to Arduino / TC4+
progen	#1 Posted on 08/04/2022 12:55 PM
1/4 Pounder Posts: 60 Joined: December 17, 2019	My current configuration is a 2.5m 3 core (w shield) 24AWG data transmission cable from the pot to A0 on the Arduino / TC4+ and then 25cm from OT1 to the SSR. Works perfectly. However, I was thinking of moving the Arduino / TC4+ to just beside my laptop and then using 2 of the cores of the 24AWG data transmission cable for the signal from OT1 to the SSR instead. Pot will then be connected with a 20cm cable to the Arduino / TC4+. The reason is because I personally like being able to see whether the TC4+ is behaving itself and communicating properly with the SSR whereas I can't see the two boards if they're mounted far from the laptop as originally planned. Is the Arduino's 5V or the TC4+'s OT1 stronger? Or is 2.5m still not long enough to worry about signal losses or interference?


renatoa	#2 Posted on 08/04/2022 1:30 PM
Administrator Posts: 2494 Joined: September 30, 2016	Interference depends on circuit impedance and wire length. OT1/SSR circuit is low impendance, versus the pot, which is higher impedance. Signals strength is similar for both, in the 0-5V range. OT1/SSR circuit signals are digital, so almost immune to interference, vs the analog signal of a pot. As a result of the above, OT1/SSR circuit is more appropriate to be remoted than the pot.


progen	#3 Posted on 08/04/2022 1:32 PM
1/4 Pounder Posts: 60 Joined: December 17, 2019	PERFECT! I'll shift the Arduino / TC4+ to the control panel then.

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