Pulse to AUX1 example

Notecard API
1

Hi all,

I’ve been experimenting with switching the AUX1 pin and it works fine by sending JSON via the USB e.g. the JSON below switches AUX1 high

{“req”:“card.aux”,“mode”:“gpio”,“usage”:[“high”,“”,“”,“”]}

It also works fine using the Environment

_aux_gpio_set=high,

However, I’ve had no success pulsing AUX1 using the example in the Docs “[Pulsing GPIO Outputs High or Low with Environment Variables]”.(Working with the Notecard AUX Pins - Blues Developers)

I have tried JSON with no success

{“req”:“card.aux”,“mode”:“gpio”,“usage”:[“high,1300,1713311000,60”,“”,“”,“”]}

or the Environment

_aux_gpio_set=high,1300,1713311000,60,

I’m using

DeviceUID dev:867730051231110 (NOTE-NBGL-500) running firmware 7.2.2.16518

When I apply changes to the Environment variable and use send the JSON {“req”: “hub.sync”} via the USB, then the Notecard connects to the server, then immediately AUX1 goes HIGH. It does not pulse & AUX1 did not go high at the correct time.

I’m stumped. Can anyone suggest what I’m doing wrong.

Thanks,

Paul H

2

Hi @hussat,

I think you’re just missing some commas in that string. The first set of args specifies which of the 4 AUX GPIO pins you want to work with (including empty spots for those that you aren’t using, which is the confusing part):

_aux_gpio_set=high,,,,1300,1713311000,60

…will pulse AUX1 high for 1300 ms for 60 seconds starting at 1713311000.

1 Like
3

Thanks Rob. Got it.

I’m using AUX1 to switch power to my sensor, which is probably a common application. As measurements are taken on a regular interval, it would be great to also be able to specify an interval.

For example, _aux_gpio_set with a value of ,,,high,1300,1713322315,31536000, 86400 means pulse AUX4 HIGH for 1300ms, valid for 3153600 seconds (1 year) from 1713322315 until 1744858315, repeating every 86400 seconds (1 day).

2 Likes
4

Hi @hussat,

This is an interesting idea. In the meantime, I would suggest looking at implementing this with a paired host as the “timer” to manage the interval.

Rob