so I just want a basic logic probe, red = LOW & green = HIGH.
I don't care for frequencies just those two basic needs although I am putting some rules down for my project. Mainly when I'm not touching anything I don't want either of the two LED's to turn on.
Attached is my idea. The probe input would be between R2 and R3. When a logic level high is put on the input the potential will be the same for the top two resisters and no current would flow right? I applied the same idea to the bottom two resistors when the probe input is grounded.
I just can't wrap my head around how to get the top gate not to trigger when the probe isn't touching anything, any ideas?
I would like to keep away from anything too bulky as I'm gonna cram this inside a pen
thanks for the help all!
*** i just realized i attached the one input of both the and gates to ground, that should be to the other side of the 5V source ****
I don't care for frequencies just those two basic needs although I am putting some rules down for my project. Mainly when I'm not touching anything I don't want either of the two LED's to turn on.
Attached is my idea. The probe input would be between R2 and R3. When a logic level high is put on the input the potential will be the same for the top two resisters and no current would flow right? I applied the same idea to the bottom two resistors when the probe input is grounded.
I just can't wrap my head around how to get the top gate not to trigger when the probe isn't touching anything, any ideas?
I would like to keep away from anything too bulky as I'm gonna cram this inside a pen
thanks for the help all!
*** i just realized i attached the one input of both the and gates to ground, that should be to the other side of the 5V source ****
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