I'm creating a logic circuit to manage the position of a door which is controlled by a DC motor.
I'm attempting to utilize a 555 chip along with an "OR" logic chip to make use of an LED as an error indicator.
1. Solid Light - Door is closed.
2. Blinking Light -
a. Door is in transit
b. System is operating on back-up power
The LED is connected to a Logic OR gate.
(1) is feed into the OR logic gate as one of the two inputs.
(2a) is managed by feeding a signal into a 555 chip which then outputs to the OR logic gate
(2b) I cannot figure out how to get 2b to work.
I'm thinking I need to feed the source signal from 2a and 2b into another OR logic gate, the output of which would feed itno the 555; however, the back-up power signal would be 9vdc (logic gates are only expecting 5vdc). I'm reluctant to use a voltage divider, as that could flucuate too much and I don't have room for another voltage regulator.
I'm attempting to utilize a 555 chip along with an "OR" logic chip to make use of an LED as an error indicator.
1. Solid Light - Door is closed.
2. Blinking Light -
a. Door is in transit
b. System is operating on back-up power
The LED is connected to a Logic OR gate.
(1) is feed into the OR logic gate as one of the two inputs.
(2a) is managed by feeding a signal into a 555 chip which then outputs to the OR logic gate
(2b) I cannot figure out how to get 2b to work.
I'm thinking I need to feed the source signal from 2a and 2b into another OR logic gate, the output of which would feed itno the 555; however, the back-up power signal would be 9vdc (logic gates are only expecting 5vdc). I'm reluctant to use a voltage divider, as that could flucuate too much and I don't have room for another voltage regulator.