Invert TTL signal?

els

I want to turn off an LED during one state and I would like to know if there is any way to invert the TTL: i.e., have one of the "TTL out" always high, and then trigger a switch to low (off) during a state. Is there any easy way in the code to invert the TTL?

Thanks!

Josh

Hi Els,

In any state where you want the line to remain high, add
{'BNC1', 1} to the OutputActions section of the state description (assuming it's BNC output channel 1 you're using). For an LED, use {'PWM1', 255}
In that state where you want an inverted pulse, you can omit this - all lines are low and LEDs are off by default.
The line will go low during the inter-trial interval, while the next state machine is being prepared. If you use TrialManager to write your protocol, you can limit the off time to ~ 200 microseconds.

-Josh

els

Josh wrote[quote='Josh' pid='1304' dateline='1580141967']
Hi Els,

In any state where you want the line to remain high, add
{'BNC1', 1} to the OutputActions section of the state description (assuming it's BNC output channel 1 you're using). For an LED, use {'PWM1', 255}
In that state where you want an inverted pulse, you can omit this - all lines are low and LEDs are off by default.
The line will go low during the inter-trial interval, while the next state machine is being prepared. If you use TrialManager to write your protocol, you can limit the off time to _~200 microseconds.

-Josh

Josh,

Thanks for the prompt reply! This is what I had been doing, but there was a visible pause in the light between trials, but I wasn't aware of TrialManager. I'll give it a go and see if it reduces the off time in my protocol.

Thanks!

Emily