HI, Im trying to count the amount of signals of a stamping machine. Every 200miliseconds there is a signal. Is this possible to count within node-red and a Raspberry PI 3b+? or is the processing time to count a signal more then 200 miliseconds?

While 200 mS should be fine - for something that is happening like that all day I would probably use something more dedicated like an arduino or esp8266 chip to be a dedicated counter - then feed the result to Node-RED. That way you won't miss anything if you have to restart the Pi for whatever reas…

Sounds well within the capabilities of a Pi and Node-RED

Any recommendation how to count it?

That's a very open ended question. Are you looking for a daily count? An hourly count? A total lifetime count? A rolling average? Different use cases will require slightly, or possibly even very different approaches.

The node-red-contrib-counter would be the place to start [image] node-red-contrib-counter A Node-RED node to create a counter with messages. [image]

[image] Carloj: Every 200miliseconds there is a signal. If there is a signal every 200 milliseconds then the signal count per day is 432000, or do the signals themselves contain more information? Or are you trying to count how long the machine is working per day?

It is the amount of products the machine makes. Every 200ms +/- there is a product

Well, i understand it. But it's only for 1 shift, so 8 hours a day. Any updates or upgrades i can do before or after that time. About the esp8266 or esp32. Could i use Mqtt to communicate? It's just a signal 1 or 0.

I tried the counter node but when the manual counter on the machine counts 50 the counter node counts 3? And when i look into the raspberry pi pin node it flashes (1,0) way to slow like every second it changes. Or could this be a framerate issue?

I don't think its a framerate issue - I can count pulses every 200ms very reliably [image] Do you know the specification of the pulse width coming out of the machine? Try adjusting the Debounce time parameter to a value of 1 ms and see if reliability improves [image]

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Carloj 13 June 2019 19:26 5

A daily count would be the best if possible

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