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edited Oct 24, 2018 at 21:16

I wonder how to calculate pulldown resistor to make interrupt work? I need to connecteconnect 5 buttons to A0 and get pressing event via interrupts. Using different resistors, finally, I made work only 4 buttons. On 5th interrupt does not fire. Currently I use the following resistors for the buttons:

R1      Vout
0       5,00
2,7K    4,45
5K      3,70
10K     2,77
22K     1,78

And Pulldown Resistor = 22K.

If pulldown Resistor = 10K I can get event for 1-3 button only. Looks like the voltage 1,78V is quite low. But I’d liked make it work with 1V at most. I use RISING mode.

PS. Arduino Nano

I wonder how to calculate pulldown resistor to make interrupt work? I need to connecte 5 buttons to A0 and get pressing event via interrupts. Using different resistors, finally, I made work only 4 buttons. On 5th interrupt does not fire. Currently I use the following resistors for the buttons:

R1      Vout
0       5,00
2,7K    4,45
5K      3,70
10K     2,77
22K     1,78

And Pulldown Resistor = 22K.

If pulldown Resistor = 10K I can get event for 1-3 button only. Looks like the voltage 1,78V is quite low. But I’d liked make it work with 1V at most. I use RISING mode.

PS. Arduino Nano

I wonder how to calculate pulldown resistor to make interrupt work? I need to connect 5 buttons to A0 and get pressing event via interrupts. Using different resistors, finally, I made work only 4 buttons. On 5th interrupt does not fire. Currently I use the following resistors for the buttons:

R1      Vout
0       5,00
2,7K    4,45
5K      3,70
10K     2,77
22K     1,78

And Pulldown Resistor = 22K.

If pulldown Resistor = 10K I can get event for 1-3 button only. Looks like the voltage 1,78V is quite low. But I’d liked make it work with 1V at most. I use RISING mode.

PS. Arduino Nano

arduino-nano interrupt

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asked Oct 24, 2018 at 21:10

zhekaus

Pull-down resistor value for interrupts

R1      Vout
0       5,00
2,7K    4,45
5K      3,70
10K     2,77
22K     1,78

And Pulldown Resistor = 22K.

If pulldown Resistor = 10K I can get event for 1-3 button only. Looks like the voltage 1,78V is quite low. But I’d liked make it work with 1V at most. I use RISING mode.

PS. Arduino Nano

interrupt