Hi,
the device address in Mervis is decimal (eg. "71" with all DIP switches on EMO set to "On"). The connection via I2C-Bus to UniPi is indicated by a LED below the address DIP switch. This is the hardware side. In Mervis you can check in debugging mode if your solution with EMO-AO5/12 works.
I cannot answer your question regarding HMI, because I only use the PWM channels 4-12 with PI/PID-controller.
Best regards
@tomas_hora I wish all at UniPi.technology a happy new year! and thank you for the answer.
Hello,
I did some tests with the EMO-AO4/12 extension board. I did measure the pwm output frequency of the PWM outputs 5-15. The frequency is 200Hz. According to the datasheet of the PCA9685 the PWM output frequency can be changed from 24Hz (min) to 1526Hz (max) by setting the PRE_SCALE register of the PCA to a different value.
I need a slower PWM frequency (for controlling a heater element). Can I change the frequency with Mervis?
Best Regards,
Matthias
There is a new version of UniPi Mervis OS downloadable (date 2016-06-02). Can I apply the debian security updates normally after mounting the filesystem writable?
There is a new version of UniPi Mervis OS downloadable (date 2016-06-02). Can I apply the debian security updates normally after mounting the filesystem writable?
Tomáš,
the BD13 helped. Thank You.
I have a further question. I want to control heating in this way:
A heating element is controlled by Relay 1, temperature is measured by 1Wire sensor, now I want to set a temperature setpoint (e.g. 90 deg.C) -> "Start" -> heating until reaching the setpoint (measured temp => temp setpoint) -> hold temp for x minutes -> switch off heating.
For holding the temperature I did test the B31_REVERSE_ON_OFF_CONTROL_SEQUENCE, but I don't no how to configure the whole application.
Best regards,
Matthias
I want to configure a timer functionality in Mervis like "press button connected to UniPi Digital In 1 -> switch on Relay 1, start a timer with an adjustable preset of x minutes to off -> switch off Relay 2 after timer runs out"
I did discover a library box called "Lib.Hvac.V1_0.Timer". Unfortunately this box is not listed in the F1 Help of Mervis. The library box uses the local variables "TStart (udint)", "TimeFirstPart (udint)", "TImpMin (udint)", "TimePeriod (udint)" and "Status (sint)". Can someone explain the functionality of this library box, the variables and the usage please?
Best regards,
Matthias
I want to configure a timer functionality in Mervis like "press button connected to UniPi Digital In 1 -> switch on Relay 1, start a timer with an adjustable preset of x minutes to off -> switch off Relay 2 after timer runs out"
I did discover a library box called "Lib.Hvac.V1_0.Timer". Unfortunately this box is not listed in the F1 Help of Mervis. The library box uses the local variables "TStart (udint)", "TimeFirstPart (udint)", "TImpMin (udint)", "TimePeriod (udint)" and "Status (sint)". Can someone explain the functionality of this library box, the variables and the usage please?
Best regards,
Matthias
I did use "assign sensors". Using "detect sensors" in commissioning mode did the trick. Thank you!
Tomaš, a question regarding this Sensor topic: I need to integrate three 1Wire DS18B20 sensors in Mervis. I did follow the tutorial and did add three devices to the 1Wire channel instead only one device like in the tutorial. But after plugin the sensors I see only the parameters for one sensor in Mervis (I did boot the Raspi with a different image containing Evok for verfication, Evok shows all three sensors correctly).
Should I configure 1Wire devices in Mervis one after another?
Best regards,
Matthias
…and is there a documentation for the default function blocks in Mervis?