Yotta A-1019 analog modules acquisition speed

[Authorless]

We have a latency problem on reading analog sensors on Yotta A-1019 modules. In the same installation we have A-1055s and A-1051 modules but with the latter everything appears quite fluid (at the limit of 10Hz declared by the manufacturer).

On the A-1019 modules, on the other hand, we notice very considerable signal delays. We have not yet taken any measures but it seems to us that these are well beyond 1sec of latency. Unfortunately with these latencies it is very difficult for us to perform timely checks on the reading of the sensors.

Is there any way to intervene on these latencies to reduce them?

[Sergio Bertana]

With reference to the analog acquisition modules A-1019 the manufacturer declares a Sampling Rate of 10sample / second (Total).

This indicates that the analog / digital converter takes 10 readings per second (0.1 Sec per reading), since there are 8 analog inputs on the module, each input will be acquired every 0.8 seconds.

I asked the supplier if it was possible to decrease the sampling time but he confirmed that it is not possible. Here is his answer ...

There is no way to improve this because it is restricted by the performance of the sampling chip. Usually high-precision analog data acquisition requires multiple samples to average data to be accurate, so the converted refresh rate is 10Hz (total). The cost of high-refresh rate sampling chips and high-precision analog chips is relatively high. If we use such hardware, the product cost will be high, and most users do not need such high refresh rate products.

[Sergio Bertana]

I add this post remembering how it is possible to use one or more analog acquisition module combined with compact CPU module to build a remote acquisition system.

The acquisition module has a sampling time of 32 mS per channel so on 5 channels we will have a maximum time of 150 mS. Time that remains so even when using the 10-channel model because it is made with two different A / D converters (one every 5 channels).

Having to create a mixed remote I / O module between digital and analog, it will be possible to combine other extension modules with the CPU module.

[Author]

Post