5 ms·

Very cool. Only thing I don't like is that when something goes really wrong with my circuit, I could probably harm my PC. Normally I just risk destroying RPi.

by comboy 12y ago

gbin 12y ago
Indeed, at least I've added a fuse and Schottky diodes to protect the PC but I'd love some advises on how to be sure people won't fry their USB controllers :)
- comboy 12y ago
  It's awesome that you made it all open source. You could probably spin up some kickstarter since making them in bulk would be cheaper (plus you get something for all the work you've done). I'd be happy to get one.
  - deleted 12y ago
    [deleted]
- Sanddancer 12y ago
  An isolating transformer, like the ADUM3160 ( http://www.analog.com/en/products/interface-isolation/isolation/standard-digital-isolators/adum3160.html#product-overview http://www.analog.com/en/products/interface-isolation/isolat...) should be more than overkill in protecting there.
  - gbin 12y ago
    Interesting, thanks for the pointer !
    - andyjohnson0 12y ago
      I use an Olmex isolator [1], which I believe is also based on Analog's ADuM chip. Its worth knowing that the ADuM only supports USB "Full speed" mode (12Mbit/sec) and not the normal "High Speed" mode (480Mbit/sec). [1] http://uk.farnell.com/olimex/usb-iso/usb-isolator-1000vdc-for-pc-laptop/dp/1795095 http://uk.farnell.com/olimex/usb-iso/usb-isolator-1000vdc-fo...
- kenrikm 12y ago
  Resettable PTC fuse for overvoltage and P-Channel MOSFET for reverse voltage protection without a large voltage drop.
deeviant 12y ago
Yep. Although not related to this kit specifically, a friend of mine built a energy meter much like a kill-a-watt using a raspberry pi. It plugged into 120 vac on one side, and usb to computer on the other side. He didn't end up doing enough to isolate the 120 vac side from the usb side and fried his computer. It was pretty impressive damage as it managed to fry the motherboard, CPU and memory.
- rasz_pl 12y ago
  haha nice :) I made wifi power meter using $15 chinese plug watt meter and ESP8266. No api no fancy stuff, just a webpage with three numbers.

Very cool. Only thing I don't like is that when something goes really wrong with my circuit, I could probably harm my PC. Normally I just risk destroying RPi.

by comboy 12y ago

Very cool. Only thing I don't like is that when something goes really wrong with my circuit, I could probably harm my PC. Normally I just risk destroying RPi.

gbin 12y ago

Indeed, at least I've added a fuse and Schottky diodes to protect the PC but I'd love some advises on how to be sure people won't fry their USB controllers :)

comboy 12y ago
It's awesome that you made it all open source. You could probably spin up some kickstarter since making them in bulk would be cheaper (plus you get something for all the work you've done). I'd be happy to get one.
- deleted 12y ago
  [deleted]
Sanddancer 12y ago
An isolating transformer, like the ADUM3160 ( http://www.analog.com/en/products/interface-isolation/isolation/standard-digital-isolators/adum3160.html#product-overview http://www.analog.com/en/products/interface-isolation/isolat...) should be more than overkill in protecting there.
- gbin 12y ago
  Interesting, thanks for the pointer !
  - andyjohnson0 12y ago
    I use an Olmex isolator [1], which I believe is also based on Analog's ADuM chip. Its worth knowing that the ADuM only supports USB "Full speed" mode (12Mbit/sec) and not the normal "High Speed" mode (480Mbit/sec). [1] http://uk.farnell.com/olimex/usb-iso/usb-isolator-1000vdc-for-pc-laptop/dp/1795095 http://uk.farnell.com/olimex/usb-iso/usb-isolator-1000vdc-fo...
kenrikm 12y ago
Resettable PTC fuse for overvoltage and P-Channel MOSFET for reverse voltage protection without a large voltage drop.

deeviant 12y ago

Yep. Although not related to this kit specifically, a friend of mine built a energy meter much like a kill-a-watt using a raspberry pi. It plugged into 120 vac on one side, and usb to computer on the other side. He didn't end up doing enough to isolate the 120 vac side from the usb side and fried his computer. It was pretty impressive damage as it managed to fry the motherboard, CPU and memory.

rasz_pl 12y ago
haha nice :) I made wifi power meter using $15 chinese plug watt meter and ESP8266. No api no fancy stuff, just a webpage with three numbers.