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  • Wiring questions

     Lukas updated 3 years, 4 months ago 2 Members · 2 Posts
  • Tornado

    January 28, 2021 at 1:17 pm


    I have a project to manage several fish tanks using Controllino Mega and I have some troubles regarding wiring of some components.

    I already plan to use Inputs A0 to A11 for sensors dedicated to water level, PH, oxygen ect..

    I also plan to use Outputs D0 to D18 to manage pumps, lights, DC motors ect..

    Now my problems is that I still need to connect 4 Ultrasonic sensor, 1 HMI and 1 motorized valve.

    The 4 Ultrasonic sensors are the following :

    With a classical Arduino Mega board I would have use digital inputs pins like for example 8 to 11 for RX and 35 – 41 for TX and use the following code to get my distance value:

    #include <SoftwareSerial.h>
    #include <SPI.h>
    SoftwareSerial A (8, 35); // RX, TX
    SoftwareSerial B (9, 37); // RX, TX
    SoftwareSerial C (10, 39); // RX, TX

    SoftwareSerial D (11, 41); // RX, TX

    For HMI wiring I also need RX and TX.

    My issue is that Digital outputs with Arduino can’t be used as Input and I still need 10 inputs to be connected (8 for Ultrasonic & 2 for HMI)

    I am wondering if I can use the remaining A12 to A15 / Input 16-17-18 / IN0 & IN1 / RS485 B & A to connect the 4 ultrasonic sensors and the HMI ?

    Regarding the motorized valve, I need to invert the DC current to open it or close it. I can do it using 4 relais and create a H bridge but I was wondering if there is a simplest way to invert polarity using Controllino Mega.

    Thank you for reading 😊


  • Lukas

    February 16, 2021 at 2:08 pm

    Hello Tornado,

    regarding the SoftwareSerial – you can use all unused digtal outputs/inputs for this purpose, but at the pinheaders, not the screw terminals.

    Regarding the motor control – have you checked this tutorial?

    Let us know!



    • This reply was modified 3 years, 4 months ago by  Lukas.
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