event counting between periodic calls

[mgarza]

It would be great to have a module for a wind sensor available, so I tried to write one. There are sensors that generates pulses/edges on each turn. To measure the wind speed it would be great to count the number of pulses/edges between 2 periodic calls of the module and get the time between these 2 calls.
I've managed to add an event counter function, however this only measures the pulses when the module is active. Is there a way to have the event counter active all the time?

def pulse_callback():
global pulse_count, last_pulse_time
with lock:
pulse_count += 1
last_pulse_time = time.time()

def windspeed(params, event):
btn = Button(WIND_PIN,bounce_time=DEBOUNCE_MS)
btn.when_pressed = pulse_callback

    time.sleep(interval)  <-- callback only active during this time

[Alex-developer]

Intersting idea,

I would not do that in python on the Pi though for a few reasons

• Pulses will be lost at high rates
• The debounce can cause pulses to be lost

An improved solution would be to count the pulses on something like an esp32 or arduino then get the results from that.

To answer your original question in the current release you cant do this as the module only runs when the flow does. In the next release there is a 'server' that you could add the code to that runs all of the time

Alex

[mgarza]

Thank you for you feedback, is there a rough date for the next release with the "server" version.

[Alex-developer]

Not as yet but its very close and in testing / Bug fixing at the moment