Connecting a Chinese (Aliexpress) edge finder V6 failed!

[pgram]

Hi,
I updated my DRO installation (Bridgeport, four-axis) to TouchDRO and am VERY satisfied.
I tried to connect a V6 edge finder, but it did not work. After many attempts, I found that the output yellow wire was not consistent (it sometimes did not follow the red LED when touching), so I sent it back.
Is the Edge finder connection a straight-on procedure, or must I insert a pull-up (or pull-down) resistor in the connector?
By the way, the connector is very tiny (my old retired hands are becoming all thumbs), and I'd like to have a reference number to buy some spare connectors from Mouser or Digi-key, if possible.
My compliments to Yuriy. Good job. If you want, I can post some installation photos.
Paolo from Italy

 

[pgram]

I decided to buy another, different Edge Finder from Aliexpress:

How do I connect his NPN-NO output to my TDA-420 adapter to avoid repeating the same mistake twice?
Just a straight connection to pins 1-2-3, or do I need any pull-up or pull-down resistor?
Sorry to ask, but I cannot see any example anywhere...
Paolo

 

[tq60]

If you measure the voltage on the wire that this should be connected to, and you see volts present, it should be fine.

If no volts you may need pull up.

Does the device need a power source?

Wait for yurili

Sent from my SM-G781V using Tapatalk

 

[MidniteMachinist]

The signal pin on the TOUCHDRO board wants to see a ground.

Do you have a picture of the probe schematic? I couldn't find a listing on AliExpress for that style of touch probe, that had a schematic among the pictures.

 

[ycroosh]

The signal pin is pulled up internally. When the probe triggers, it should be grounded. It can be the other way around too (i.e. grounded when inactive, and not grounded when triggered). In either case, the probe must be plugged in when the board powers up.

Also, mid-way down on this page: Recommended Scales and Touch Probes covers recommended probes.
Mid way on this page: TouchDRO TDA-400/420 Adapter Manual covers connecting a touch probe to a TDA adapter.

Regards
Yuriy

 

[flutie98]

The signal pin is pulled up internally. When the probe triggers, it should be grounded. It can be the other way around too (i.e. grounded when inactive, and not grounded when triggered). In either case, the probe must be plugged in when the board powers up.

Also, mid-way down on this page: Recommended Scales and Touch Probes covers recommended probes.
Mid way on this page: TouchDRO TDA-400/420 Adapter Manual covers connecting a touch probe to a TDA adapter.

Regards
Yuriy

After initial board bootup with the probe connected can you then disconnect/reconnect at will? Have not tried it out with new drewtronics probe but would prefer to unplug and store in tool chest when not in use.

 

[MidniteMachinist]

I have THIS probe. I wired it exactly as the schematic on that page shows (V+ to V+, GND to GND, SIG to SIG).

I don't leave the probe connected to the TouchDRO, as it's shared between 2 machines (both with T-DRO). I've had no issues powering down/booting up the adapter with the probe disconnected, and I connect/disconnect it all the time once the board is powered up.

I think as long as the probe is normally open (NO), you don't need to have it connected at boot.

 

[Alan]

I have THIS probe. I wired it exactly as the schematic on that page shows (V+ to V+, GND to GND, SIG to SIG).

I don't leave the probe connected to the TouchDRO, as it's shared between 2 machines (both with T-DRO). I've had no issues powering down/booting up the adapter with the probe disconnected, and I connect/disconnect it all the time once the board is powered up.

I think as long as the probe is normally open (NO), you don't need to have it connected at boot.

I have that same probe and also shared between machines. Working great so far.

 

[ycroosh]

As a general rule, you should not be plugging or unplugging things into/from TouchDRO when it's powered up. Besides the fact that MiniDIN connectors have insertion count rating of 5000 in the best case scenario, you introduce a decent chance of damaging something internally with an ESD zap. Things that are hot swappable usually have extra protection (like a USB port, for which there is specked out protection circuit. Scale and aux inputs have some basic protection (on the non-DIY adapters), but those are good enough only up to HBM (Human Body Model).

Regards
Yuriy