Author Topic: OAK level shifter - wrong pinout of one servo connector  (Read 1557 times)

Solarflare

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OAK level shifter - wrong pinout of one servo connector
« on: March 15, 2016, 03:20:06 pm »
Hi,

could it be that the middle of the 3 servo connectors has GND and port switched?

exeng

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Re: OAK level shifter - wrong pinout of one servo connector
« Reply #1 on: March 15, 2016, 05:50:21 pm »
Yes it does seem that P1 on the level shifter servo header is connected to ground.

 I have 2 level shifters and on both of them P1 Ohm's out to GND (not it's header GND). Now I'm trying to trace where that servo header GND pin goes... hopefully to the Oak P1 through some level shifting circuit. I'll post what I find.

Good catch. I've only used P2 and P5 on the level shifter. When Erik is back online perhaps he can check the schematic.
« Last Edit: March 15, 2016, 10:23:45 pm by exeng »

exeng

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Re: OAK level shifter - wrong pinout of one servo connector
« Reply #2 on: March 15, 2016, 06:08:20 pm »
OK... If I run a unique blink sketch to P1 (which happens to also be the onboard LED) with an external LED connected to the level shifter servo header GND pin on the P1 servo header, the external LED mimics the onboard LED. So yes indeed, it appears that P1 and GND are reversed on the level shifter.

I will make note of this in the level shifter tutorial.