Hi,

The best way to calibrate the AI on the Unipi 1.1 is to turn off the transformation for the AI, connect a voltage source with an output of exactly 10 VDC and look at the value on the AI in the Mervis IDE. Remember this value and then insert it as parameter X2 in the two-point linear transformation.

Set parameter Y2 to 10 if you want to get the voltage value directly, or set to 100 if you want to get the percentage value [%].

Set both parameters X1 and Y1 to 0.

In the attached picture you can be inspired by the settings for my Unipi 1.1.

Have a nice day
Regards

Antonín Všetula,
Technican

Hi,

What version of Mervis IDE/RT do you use?

Hello,
Mervis platform developers are already researching this issue. According to tests, the block has bad timing and for long events it is visible.

Thanks for reporting.

Best regards,
Antonin

Hello @Petr-Helebrant
When converting a project from Mervis IDE version 2.3.0 to version 2.4.0, it is necessary to make the adjustment described here.

Hello,

Here's a new tutorial: https://kb.unipi.technology/en:sw:01-mervis:hmi-image-hidden

Good luck!

Hello @HVAC-Arthus

First, I recommend downloading and installing the latest Mervis IDE and Mervis OS available here: https://kb.unipi.technology/en:files:software

Then open the project in a new IDE and save to convert the project to the new version. Before converting to the new version, we recommend that you always create a project archive with a suitable name.

If you use the RaspberryPi 4 computing module for Unipi 1.1 / Lite, this should also solve your problem, as support for these computing modules was added only in the last version. With my RaspberryPi 4 and Mervis v2.4.0 your project works.

Hello @HVAC-Arthus

Please send us your project to: support@unipi.technology. We will check if everything is in order in the project.

Best regards,
Antonin

Hi Sabina,

The best way to communicate between SW Mervis and third party devices is to implement the Modbus protocol on these devices. Subsequent operation and modifications are simpler and faster. Another great advantage is that this protocol basically allows you to operate multiple slave devices on one serial line.

In this case, Openport is a functional block that takes care of opening the port, ie its reservation within the system.

In the input string (def) for FB io.openport it is necessary to enter for UART port 1: "def: = 'serial: 1: 9600,8, N, 1';". I also enclose a tested code example in ST for Unipi 1.1.

Hi,

You can use power from the I2C connector for this current. The 5V pin in the I2C connector is directly connected to the 5V power supply from the DC connector.

If you want to be sure, use the capacitor (1000 μF) mentioned in the article on the sensor.

Hi,

The sensor output is 0-5 VDC. The analog input on the Unipi 1.1 measures in the range 0-10V. Directly measured voltage values are available in EVOK, so it is not necessary to perform further calculations.

You can connect the sensor as you type: connect the ground (-) of the sensor to AI- and connect the analog output (A) of the sensor to AI+.