HMI design
The first thing we should do is lay out our HMI. Based on the requirements, we are going to need the following at the minimum:
- An alarm table
- A series of inputs to allow the user to input the temperature of the oven
- A gauge to show the current temperature of the oven
- A power switch and LED for the oven
- An LED for the following:
- Oven ramping up to temperature
- Oven at temperature
- An alarm acknowledgment button
With the requirements, we can lay out our HMI to look like the following screenshot:
Figure 15.1 – Oven HMI
This is a simple HMI layout for our project. We have a simple Power button in the lower left-hand corner with a ramp-up and target temperature spinner above it. In the center of the screen, we have an alarm table for our alarm readout as well as three LEDs to indicate that the oven is on, another LED to indicate that the temperature of the oven is human-safe, and finally, an LED to indicate that...