That's a thought, any with good pre-made connectors and four separate conductors (maybe two grounds)?
Yessir, can optical carry 3.3V power?
Check my other thread, has schematic: Five beehive sensor ICs (I2C and 1.8V max)
And my new thread, RJ45, RJ12, RJ14 cables straight-through or crossover?
--
Thanks,
- Win
On a sunny day (12 May 2019 06:20:05 -0700) it happened Winfield Hill wrote in :
I used DIN 180 degree audio connectors on a 8052 based box in ancient times, still have that box :
How much power? 70 Watt has been done:
Look? They need to be rated for outside use. They need to be weather tigh t or the cable ends need to be behind glands to seal out moisture as well a s the plastic being resistant to UV light unless you are putting them in a race. You seem to be greatly over designing the noise issue and under desi gning the environmental issues.
Maybe they make glands for flat cable, but I haven't seen them. The ones I 've seen are for round cable.
-- Rick C. ++ Get a 1,000 miles of free Supercharging ++ Tesla referral code - https://ts.la/richard11209
crosstalk from a DATA edge into the clock line can cause a false clock edge.
and therefore an incorrect read of the data.
m
I've seen seals that are a couple blocks of firm rubber clamped together then clamped again by a frame. For example a "stocks" shape (two blocks with facing semicircles cut out) that grips the cable. Two blank blocks would do for flat flex, if maybe not ribbon cable (because of its ribbed profile?).
Tim
-- Seven Transistor Labs, LLC Electrical Engineering Consultation and Design Website: https://www.seventransistorlabs.com/
We're still debating the best way to get cables in/out of the beehive monitor case. The project P.I. wants to try individual glands, on the removable top. Six cable connectors would be assembled after running their wires through glands mounted on the lid, with a painful PCB mating and cable-pulling step, to mount the lid and dress wires, before tightening six glands.
I'm in favor of the mate-two-blocks approach, because the cable connectors can be plugged in, strain-relieved with cable ties, and remain as a single piece with the electronics. The lid, with cable cutouts is mounted over. I did this last year, using a mass of RTV for glands, but squeezable blocks would be better. Our Raspberry Pi server boxes use two blocks, they're fast and convenient to open and close, and they never leaked. Their rubber pieces have considerable give, to accommodate any wire type, or multiple wires.
--
Thanks,
- Win
The I2C transmitter has, in a sense, an output impedance, but it is a time dependent one. It is Low-Z when at logic low and Hi-Z when at logic high. T hat is (for any common I2C scheme), it is impossible to "match" I2C TXers a nd RXers to some fixed line impedance. (The line won't be properly terminat ed anyway. Slow slew can save I2C at the obvious cost of data transmission speed.
I2C signal integrity is like saying "Jumbo Shrimp." There are things that c an be done, but it is (from the get-go) a crap system from the perspective of signal integrity.
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