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20x pulse input with cr6, how?


mortenx Nov 25, 2018 06:28 AM

i want to use 20 pulse sensors(rain gauges) with cr6, what is the best way to do it ?


mortenx Nov 26, 2018 10:41 AM

is it possible to connect i2c IO module to cr6  ?

https://www.ebay.com/p/Pcf8575-IO-Expander-Module-I2c-to-16io-for-Arduino/7004521755?_trksid=p2047675.l2644


GeodeNZ Nov 26, 2018 03:11 PM

This could get you most of the way https://www.campbellsci.com/sdm-io16


mortenx Dec 19, 2018 07:20 AM

is it possible to use SDM-IO16 as 16 pulse input ?


GeodeNZ Dec 19, 2018 04:00 PM

From the specifications;

  • Provides 16 digital I/O ports
  • When configured as an input, each port can monitor logic state, count pulses, measure signal frequency, and determine duty cycle

mortenx Dec 20, 2018 02:17 AM

from SDM-IO16 spec.. "Maximum Pulse Measurement Interval 15.9375 s"

What this means ? that raingauge pulses(pulse interval usually more than 15s) are nort read?

Maximum Pulse Measurement Interval 15.9375 s


aps Dec 20, 2018 06:24 AM

The pulse measurement interval is a limit for frequency measurement.   You can count pulses over longer periods.  Normally you would simply ask the interface for the pulse count total every minute or perhaps hour if measuring raingauge.


mortenx Mar 5, 2020 08:47 AM

i want to use cr6 and read 40 raingauges what is better ?

can i read raingauge pulses with AM16/32B and how many pulse channels there is ?

https://www.campbellsci.com/am16-32b

or is it better to use 2x SDM-IO16

https://www.campbellsci.com/sdm-io16


JDavis Mar 5, 2020 02:18 PM

You cannot use multiplexers to read pulses. The solution is to use the CR6 with 2x SDM-IO16.


mortenx Mar 6, 2020 03:38 AM

how many SDM-IO16 can be used with one CR6?

and what distance?


mortenx Mar 22, 2020 02:04 AM

what is max distance between cr6 and SDM-IO16 ?


nsw Mar 23, 2020 04:56 AM

Up to 15 x SDM-IO16 can be used on one CR6. Giving up to a capacity of 256 pulses inputs through that one SDM port.

The manual for the SDM-IO16 states a maximum SDM cable length of 6m. You may be able to use longer cables, but they will need to be good quality, shielded, etc. In most cases, you simply have to try it out to find whether you can use longer cables. The manual is on the website.

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