Introduction
A TWI devices shield for Arduino was listed in previous post. In this post I show only a simple digital input/output shield for Arduino Uno.
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| Finished assembling of this shield |
However this stuff can be easily hook up on a single breadboard. I made it because of free time and components stocking.
Copper Board Design of Arduino Shield
It’s not necessary to draw a schematic diagram for this board. All component’s connections are easily seen on Arduino Uno board.
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| Diagram of this Arduino Uno shield |
Analog Input
A 100kOhm variable resistor or POT placed on board to connect to pin A0 of the Arduino Uno. It varies the input voltage between 0 to +5V.
Digital Inputs
Two tactile switches connect to digital pin 4 and 5 of Arduino Uno. They don’t have any external pull up resistors because the programmer can pull them high in program.
Digital Outputs
A single red common cathode seven-segment display connect between pin 7 to 13 of the Arduino Uno. It’s already have its current limiting resistors to make it work safe.
An active buzzer connects pin 6 of the Arduino Uno. Since the output current of Arduino Uno digital pin is up to 40mA, it no need to be driven from a transistor.
Copper Circuit Pattern
This circuit board was design in Proteus 8.x using its built-in Arduino Uno board template.
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| PCB design view in software |
Using toner-transfer-method can make this PCB easily done.
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| Copper layer soldering side |
Top side may ignored to printed it on board panel.
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| Top components silk screen side |
Click here to download zip file of this light-weighted PCB project.
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| Top component layer |
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| Bottom copper soldering layer |
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