Circuit to avoid reasonable overcurrent and ESD protection for UART
$30-250 USD
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Dibuat hampir 9 tahun yang lalu
$30-250 USD
Dibayar ketika dikirim
Background and goal:
I have a raspberry pi that communicates via the UART (gpio-pins) at 115200 baud with another microcontroller (that I do not have control over and can't modify). That controller gets fed power from an USB-port which allows for 5V and only small currents.
So from the other device I have 3.3V based UART rx/tx, GND and 5V.
My goal is to put something inbetween these two parts and make them galvanic separated (right words?) so that when a lightning strikes and burns my raspberry, nothing happens to the other microcontroller.
I understand that a direct hit with a lightning strike will probably blow the house away, but what I'm after is something reasonably good. I have these things at home that I put between my power-socket and my device that can handle lots of voltage and spikes.
To keep things yet more reasonably, I'd like the components to be no more expensive than I can buy them for max $10-15. This will keep expensive fiber-optivs-solutions at bay I think...
Requirements:
* You should have Experience and/or know Best practices in this field in addition to just reading up on the rms-values etc. from datasheets.
Deliverables:
* A simple schematic (napkin is ok, as long as I can understand it)
* BOM for me to build it, Preferrably from Farnell if possible (All through-hole please)
Please use direct messages or ask in the public board and I'll try to clarify req.
Hello Sir,
I am a full time working freelancer and I am available on freelancer most of times and I can provide you the required prototype as you want it.
I have very good feedbacks from my previous employers and I have been doing prototyping for many years.
Please contact me if you are interested. I have attractive milestone planes that assure the satisfaction of both parties. Thank you
Anthony
hello ,, again
i hope you free right now, i am looking to direct chat with you
i can help you, but i wish to know your problem correctly befpr doing anything ,
good luck
It's very simple ( even ashamed to take the money ). There's a whole group of special chips digital-isolators. These include Adum1201 ( Analog Device ), ISO7421 ( TI ). I usually use anything from this. There are others. But they only in SOIC-package. You can (and should) use the breadboard. Cost $ 1-2. Are everywhere. Farnel and DigiKey. Meals can be done with dc-dc P6AU and similar modules.
If it is not clear how to connect - skype elaleksom. I will draw a schematic. Good luck.
As discussed I can give your good solution. I guess you will build the circuit and do the necessary programming. The cost of the BOM depends on the isolation voltage needed for the galvanic isolation.