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Example of Raspberry Pi HMI Node-RED. NORVI has a set of node-red nodes that makes programming easy.
Here is an example of using the Raspberry PI HMI Digital Input node for Node-RED. This node facilitates the control of NORVI-RPI-HMI inputs.
The HMI-I1 node serves as a digital input node, representing the inputs of the HMI. It generates a “msg. payload” with either a 0 or 1 depending on the state of the input pin. Configuration of this node involves selecting the desired input.
Inputs: msg. payload (Boolean) – The payload will be a TRUE or a FALSE.
Outputs: msg. payload (Boolean) – The payload will be a TRUE or a FALSE.
TRIGGER TYPE: RISING, FALLING, BOTH
INPUT = SELECT INPUT NUMBER
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Let’s create a simple example program using the RPI-HMI-IN node. When a button is pressed it contains true and false and this represents a trigger. Here, to display the program in the Node-RED dashboard added a switch node (digi 01 & digi 02) to it as a dashboard node.
After setting the configuration of the program, the user interface of the RPI HMI should be as below.
This schematic shows the connection between the RPI-HMI inputs. When the inputs are in the OFF state, the GPIO goes LOW, and when the input is in the ON state, the GPIO goes HIGH.
Creating sustainable solutions that empower integrators, solution providers, and consumers.