2camjohn
Member
Im not sure whether i should post this in the microcontrollers section, either way Nigel Goodwin is gonna answer and thats all i really need :wink: :wink: :wink:
I have a PIC circuit which runs off a 9V battery to control a powerful motor.
I have two inputs which are both connected to the interrupt pin. One of the inputs is external and I am detecting the rising edge of this signal, the other is from a switch on the board with a weak pull down resistor.
They are connected to the same interrupt input using diodes.
The problem is when the battery is very low the switch will not go high enough to cause an interrupt.
The pull down resistor is 100k ohm.
Can I change the value of the pull down resistor to stop this from happening.
I am already using schotty diodes to reduce the voltage drop.
Cheers
John
I have a PIC circuit which runs off a 9V battery to control a powerful motor.
I have two inputs which are both connected to the interrupt pin. One of the inputs is external and I am detecting the rising edge of this signal, the other is from a switch on the board with a weak pull down resistor.
They are connected to the same interrupt input using diodes.
The problem is when the battery is very low the switch will not go high enough to cause an interrupt.
The pull down resistor is 100k ohm.
Can I change the value of the pull down resistor to stop this from happening.
I am already using schotty diodes to reduce the voltage drop.
Cheers
John