Column: Electronics design


Te analogue input can handle


Vcc + 0.5. Tis means that the only way to voltage greater than that is to use a suitable potential divider. Finally, a PWM on D3 runs at 31kHz,


with a duty cycle of 0 to 100%. A PWM is a digital signal that can have a high portion changed in width compared to the low portion, thereby changing the average equivalent level: 0% = 0V, 50% = 2.5V, 100% = 5V


Troubleshooting Unexpected results would will most likely be due to communication faults, hardware issues such as a faulty potentiometer or ECIO40P, for example, or a soſtware bug. To determine if it’s a communications


issue, open the console (View menu, select Consoles), and undock it so the app developer panel can be made larger. Select the ECIO40P API tab. If communication is OK, you will see


something like:


To resolve a communications issue


check the following: • Is the correct comport selected within properties?


• Has some other soſtware taken over the port?


• Is only one instance of the app developer running at the time? With the hardware issue, if


If there is a problem with communication or firmware, then you will see:


communication is confirmed working, measure the voltage on the pin that is showing unexpected results. It should be steady and not floating. If the voltage is correct, then


make sure the ECIO40P has the ECIO40P app developer firmware programmed.


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