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I have two Arduinos each one is powered by a 9 volt wall plugin adapter.( I paid around 8 dollars for each plugin adapter ).
Can I connect the ground from one Arduino to the ground in the other Arduino?.
I read online I should not connect an i/o line from one Arduino to the i/o line of another Arduino unless the both share the same ground. Is that correct?
I am looking for someone to create Gerber files or maybe a finished PC board from my instructions. the PC board will be an Arduino Mega sheild with 26 relays 26 resistors and pcb terminal block connectors
thank you
Steven
I am doing a lot of repetitive stuff. Connecting 45 I/o lines with 45 relays.
So I don't want to draw a schematic.
But again I have a problem with the eagle size limitation. What can I do about that?
I want to etch an Arduino Mega shield.
What software do you recommend I use to draw my layout?
I don’t like Eagle because it forces you to draw a schematic and my project exceeds its size limit of 4x3.2 inches .
Thank you
Steven
aren't the 100 ohm pull-ups better for my noisy environment? ( to increase the current and reduce effects of noise coupling)
Any comments on my bigger question?
I have built in place 22 momentary SPST pushbutton switches with 23 wires (one common wire and 22 separate running to all the switches). Note there is electromagnetic interference noise in the area.
Option one .
Use Arduino Mega2560
Put my common wire to ground
Put a 100 ohm pullup resistor on...
I don’t understand. Are you talking about the input impedance on your oscilloscope?
Or are you saying I can build the circuit with no resistor as pictured?
Regarding the relay it should be able to drive .5 amp at 5V on the contact side I think maybe I’ll use a small reed relay like HE721A0510.
And I think I’ll use the ULN2803 instead of the 4069 hex inverter because the former has more gates per package( eight as opposed to six).
My question is...
I have (about 22) momentary SPST switches which I want to control corresponding relays ( And I want the relays to fire for 3 seconds).
I saw a one shot monostable multivibrator circuit Consisting of a 555 and two resistors and two capacitors.
So 22)555s and 44) resistors and 44) capacitors...
I would like some help in selecting the simplest micro-controller for my project.
I will have 22 momentary SPST switches and 22 very small relays whenever a switch is pressed (regardless how long the button is held down for) a corresponding relay will fire for 3 seconds. So I need a minimum of...
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