tinou

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Attopilot current sensor
« on: November 09, 2017, 12:33:22 pm »
I have received my attopilot 50v 180A. When i connect my batterie i can control 15.9 v between gnd and i (vcc current). Normaly dot not more 3.3v no?
1v between gnd and v.
It's ok?
I can plug this current sensor without dommage for my revo board?
Thankss
« Last Edit: November 09, 2017, 12:58:20 pm by tinou »

Re: Attopilot current sensor
« Reply #1 on: November 09, 2017, 06:21:36 pm »
There are 3 pins
- I
- V
- Gnd
do not connect anything else from this sensor to the Revo.

You always measure Gnd and something else, in this case you measure Gnd to V for voltage and Gnd to I for current.  You measure both of these using the voltage scale on your meter and they should never be more than 3.3 volts.

Use this information to set it up:
https://librepilot.atlassian.net/wiki/display/LPDOC/Configure+a+Current-Voltage+sensor
Connect Gnd to pin 1 of FC connector
Connect I to pin 3 of FC connector
Connect V to pin 4 of FC connector
nothing else

For future reference, if you need your sensor to have a switching BEC, these APM sensors work well for about the same price (about USD $4.50 shipped).  I have installed one and tested it but not flown it yet.
https://www.ebay.com/itm/APM2-6-2-5-2-52-Power-Module-Current-Module-APM-with-5-3V-DC-BEC/272557603567

Here are some good pictures.
« Last Edit: November 09, 2017, 06:34:22 pm by TheOtherCliff »

tinou

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Re: Attopilot current sensor
« Reply #2 on: November 09, 2017, 07:05:28 pm »
Thanks for your answer.
From gnd to v i have vcc curent!!! 16v! So for sure my attopilot is dead!
From gnd to i i have 1v so this its ok.
20dollards lost :(
Thanks for your link i buy a new one

Re: Attopilot current sensor
« Reply #3 on: November 09, 2017, 07:14:04 pm »
From gnd to v I have vcc current!!! 16v!

Use the voltage scale for both of these measurements so:
From gnd to v I have vcc voltage.

But I assume that is what you meant and that you measured it correctly.

tinou

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Re: Attopilot current sensor
« Reply #4 on: November 09, 2017, 07:28:25 pm »
Yes i check this correctly with my multimeter.
Between gnd to i 16v.
Between gnd to v  1v
So can i use only the v for know my voltage without connect i?
Just the time for order and received a new one

Re: Attopilot current sensor
« Reply #5 on: November 09, 2017, 07:40:33 pm »
Which is broken?  "Gnd to V" or "Gnd to I"

You can use just the one that works and not connect the broken one at all, leave that wire disconnected from FC or it will damage FC.

Maybe we can figure out how to fix the broken one.  Use magnifying glass to examine sensor looking for solder blobs shorting things out or damaged / missing components.

Do you understand that the heavy battery + wire is different than the V sensor output?  :)
« Last Edit: November 09, 2017, 07:45:21 pm by TheOtherCliff »

Re: Attopilot current sensor
« Reply #6 on: November 09, 2017, 08:44:24 pm »
One post he says V is broken and the other he says I is broken.  :)
I started writing debugging post but waiting on clarification now.

tinou

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Re: Attopilot current sensor
« Reply #7 on: November 09, 2017, 09:42:23 pm »
Yes sorry.
So for be clear :
Between gnd and i i have 16v
Between gnd and v i have 1v.
This is with 4s battery.
With 3s battery :
Between gnd and i i have 12v
Between gnd and v i have 0.75v
So my i is broken
I have check all connection and i don't see anything wrong

Re: Attopilot current sensor
« Reply #8 on: November 10, 2017, 06:27:27 am »
Bad connection to any of several IC pins could cause that.  Something wrong around the 73.2k resistor could cause it.

Look for damage / broken / bad traces / extra solder with a magnifying glass in these areas.

The circuit is simple enough to use an ohm meter to trace the whole thing and verify resistor values.

Good luck.

tinou

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Re: Attopilot current sensor
« Reply #9 on: November 10, 2017, 08:55:03 am »
Thanks for all your answers and your time its very apreciated.
For sure my multimeter doesnt check a 70kohms. I have a megaohmeter in my job but i don't know if i use this if some dommages can be cause (1000v)
This weekend i will check with a big class. I hope i will find the problem.
You have test the item of your ebay link so i think pourcharse it. Sure i and v outpout don't exceed 3.3v?
Have a nice day

Re: Attopilot current sensor
« Reply #10 on: November 10, 2017, 09:30:36 am »
The voltage factor is 10 and the current factor is 18

I recall that means that sensor signal less than or equal to 3.3v up to 33 volts or 60 amps.  For more than that you can add/change a resistor.

The add says the module can handle 25 volts (not 33) and 90 amps.

The original authentic version was 18 volts so keep it to 4s or less in case the seller is wrong?

Do you need more than 4s or more than 60 amps?

tinou

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Re: Attopilot current sensor
« Reply #11 on: November 10, 2017, 10:43:15 am »
4s its ok but i need 120A mini :P