Lookc 4x4 software

For example, if we give a high on row 3 and reads the status of column 1 as high, that means, S9 has got pressed. So we check every possible combination here. Please note: there are many ways to this step, but we are doing the easily understandable way. Set a row bit high and then scan each line in the column to check whether it is high.

If it is high then a key is pressed. The above steps are essential, but we need to add some noise filtering techniques because noise spikes may get detected as false keypress event in above scanning methods. These are spurious spikes generated during keypress events. Normally several spikes get generated during a key press because of the mechanical contacts in the switch and it causes multiple spikes, which may be detected as multiple keypress events instead of a single event.

Below is an Oscilloscope screenshot of the keypress event. There you can see, there are multiple spikes during the low to high transition. We can filter these spikes with the help of either a hardware circuit or a software routine. Hardware methods need to use low pass filters in each line which increases the number of components in the circuit. Here we use the easiest way, the software.

We are going to use time window for reading the port status. Introduce a delay between detection and scanning. By introducing a delay of ms between detection and scanning, we can differentiate between spikes and actual key press. In this mode, row pins are connected to the microcontroller in pull-up mode, i. So we need to set low to the port to check for the keypress.

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