low5545 WROTE:Does that mean that pins K5 - K8 are set as input and pulled LOW; K1 - K4 are set as input and set high. And when you press button 1 (example) C1 and R1 will connect. When that happens, the voltage will short to K5 instead of K1 because K1 is pulled up to high (internal pull up resistor). This will make the reading on K1 to show LOW from HIGH and at K5 HIGH from LOW. This way, I can read the keypad, right?
low5545 WROTE:If columns are set as input, rows are set as outputs (LOW). If a button is pressed, the current will short to the row and columns will get a LOW reading. If so, how can you determine the row of the button?
Return to Electronic Component
Users browsing this forum: No registered users and 0 guests