Can you make an example on how to use the library in continous mode using more than one input?

Question

Can you make an example on how to use the library in continous mode using more than one input?

Potul72 opened this issue 4 years ago · 3 comments

Answer 1 · 2020-09-23T16:54:15.000Z

@Potul72; I am hesitating to do that because I do not recommend to use the continuous mode when you want to change channels. There is only one register for the conversion results and if you request it with getResult_V() or getResult_mV() you will get what is currently in the register even if a conversion is ongoing. So it could happen that you change the channel request a result and still get the result from the former channel. The isBusy() function which is used to wait for the latest conversion in the single shot mode does not work in the continuous mode.

If you really want to use the continuous mode despite this issue, you just need to change the channel with setCompareChannels(your choice), but add a delay() before you request the result. The delay needs to be adjusted to the sample rate. The slowest rate is 8 per second. So with delay(125) you are on the save side for all sample rates. But I personally don't like this too much.

Answer 2 · 2020-09-24T06:30:56.000Z

Hi Wollwewald, Thanks for your fast response. Let me ask another question. When the SPS are set to for example 120, and get result is called every second, the register is averaging the previous 120 readings? Thanks, Regards, Roger El dc., 23 de set. 2020, 18:54, Wolfgang (Wolle) Ewald < notifications@github.com> va escriure:

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@Potul72 <https://github.com/Potul72>; I am hesitating to do that because I do not recommend to use the continuous mode when you want to change channels. There is only one register for the conversion results and if you request it with getResult_V() or getResult_mV() you will get what is currently in the register even if a conversion is ongoing. So it could happen that you change the channel request a result and still get the result from the former channel. The isBusy() function which is used to wait for the latest conversion in the single shot mode does not work in the continuous mode. If you really want to use the continuous mode despite this issue, you just need to change the channel with setCompareChannels(your choice), but add a delay() before you request the result. The delay needs to be adjusted to the sample rate. The slowest rate is 8 per second. So with delay(125) you are on the save side for all sample rates. But I personally don't like this too much. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#12 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AOXXWE3XFIOOLGX4VAZ37LTSHIR4RANCNFSM4RW4CNVQ> .

Answer 3 · 2020-09-24T17:03:12.000Z

Hi @Potul72, this would be nice, but is unfortunately not the case. This is a hardware limitation, not a library limitation. This feature would be on my wishlist if someone would design an ADC for me. I would also like to see continuous measurements on all channels in parallel with separate alert thresholds. Haven't found such a device yet. However I still like the ADS1115.