Digital Output (Open Collector) to Analog Ground?

[Why Not Indeed]

Bonus points for putting the coloured bands in your sketch

 

[RandomGrinch]

Bonus points for putting the coloured bands in your sketch

Ssh, we won't mention that Brown, Blue, Red is 1.6k Ohms

 

[bernardgreen]

- just the one resistor in your final diagram, will work fine.

Still need the two 0 volts to be connected together

 

[twixx]

Still need the two 0 volts to be connected together

Will they not be connected at their earth points?

 

[twixx]

Ssh, we won't mention that Brown, Blue, Red is 1.6k Ohms

What’s good, red, blue, brown? Or vice versa?

 

[Harry Bloomfield]

Ssh, we won't mention that Brown, Blue, Red is 1.6k Ohms

Do I lose points, for not spotting that?

 

[twixx]

This now gives me 12v on the brown/grey line. Triggering DOUT has no impact.

I've tried both Normal and Inverted.

I'm lost/stuck

 

[Harry Bloomfield]

This now gives me 12v on the brown/grey line. Triggering DOUT has no impact.

I've tried both Normal and Inverted.

It will be very fast batches of data, you likely will not spot it with a multimeter. You would need a 'scope to see the brief pulses.

 

[twixx]

I'm triggering DOUT for a specified period of time... My receiving unit needs analog ground... The setup is basically a trip switch that triggers DOUT, the receiving unit needs to receive GND. Then for "defined period of time" DOUT remains tripped, and GND remains locked, during which the "light" comes on, after period of time DOUT changes and the light goes off again.

 

[Harry Bloomfield]

I'm triggering DOUT for a specified period of time... My receiving unit needs analog ground... The setup is basically a trip switch that triggers DOUT, the receiving unit needs to receive GND. Then for "defined period of time" DOUT remains tripped, and GND remains locked, during which the "light" comes on, after period of time DOUT changes and the light goes off again.

OK, try the opposite - a pull down resistor...

Connect your resistor between DOUT and ground.. It seems wrong, for an open collector, but it will do not harm to try it.

 

[twixx]

Will try, appreciate it!

This is from the manual of the device, does this suggest there's no float?

I mean, you've probably guessed I know nothing, so...

 

[RandomGrinch]

Can you tell us exactly what devices you are trying to wire up?
A photo of your connections may also help us.

 

[twixx]

OK, try the opposite - a pull down resistor...

Connect your resistor between DOUT and ground.. It seems wrong, for an open collector, but it will do not harm to try it.

Without the resistor in place, the DOUT <> GND line has 5v. With the 1K, it has 0.47v. I see no movement at all when I toggle DOUT. There was reference to needing more than 1.7 or something before to go from H to L. Could the 1K be too much?

Edit: I tried 100 ohm, and it stuck at 0.50, but again, no movement on DOUT toggle.

Can you tell us exactly what devices you are trying to wire up?
A photo of your connections may also help us.

GPS Tracker & Amp

The theory is that I can have the tracker send a "GND" signal via DOUT to the Amp and hold ground "until I say so".

The wiring is "good", well, for "normal functionality"... it's just this DOUT <> GND issue. That said, each device has it's own direct line to +, and own - ground points.

 

[danechip]

Ssh, we won't mention that Brown, Blue, Red is 1.6k Ohms

And 20% tolerance!!

 

[twixx]

I've just noticed something..................................................................................................................

The colour scheme on the website, suggests DOUT as being "Grey", and I was also advised Grey by two separate sources....

But on the unit itself, it says DOUT is white... Might be a nice win in the morning...

I always always always get stung by the obvious/taking things as gospel.