Open Source Ecology KiCad 101, 4 Oct 2020

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From YouTube: KiCad 101 + Minimalist Arduino Build - Part 3

Description

KiCad 101 + Minimalist Arduino Build - Part 3

Here we add an LED to the basic microcontroller design.

KiCad is an open source electronic design software suite. Here we provide a tutorial where you learn to design circuits on a printed circuit board - or more simply - on a stripboard. We design and build a minimalist Arduino - OSEino - and then build it by making connections.

This is a 5-part series.

The next tutorial series to be made will include generating toolpath files for milling circuits using the OSE D3D CNC Circuit mill.

https://wiki.opensourceecology.org/wiki/D3D_CNC_Circuit_Mill

We will use the minimalist arduino as a basic test case for milling a circuit, so that we can build a CEB press controller with the circuit mill.

https://wiki.opensourceecology.org/wiki/CEB_Press

This is part of a toolchain that includes the 3D Printer, CNC torch table, and CNC Circuit mill for building heavy machines that can be controlled with a , microprocessor such as the OSEino.

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What you see here at Open Source Ecology is an ambitious open source project for the common good. Join our development team:

http://opensourceecology.org/wiki/OSE_Developers

We run One Day Extreme Build workshops in many locations. Please put yourself on our map if you'd like us to host a workshop near you:

https://microfactory.opensourceecology.org/request-a-workshop/

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Welcome in this video we're going to drive an led with the minimal arduino that we created in the previous video, in addition to the minimal arduino, we are going to use a red led and a 220 ohms resistor, both of which you see here.

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In addition, we will use an arduino uno to program the atmega328 microcontroller and a couple of more dupont wires and some electrical tape.

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We will build on the previous keycap project and we'll add the led and resistor to the schematic. So, let's open the schematic layout editor, where we see the schematic of the minimal arduino that we created in the previous video.

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As explained in the first video, the arduino drives the built-in led on pin 13, which matches with pin 19 on the atmega328. As you can see here, this means that we have to connect the led to pin 19..

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Let's add the led to the schematic, we press a to add a component search for led and choose the first most general one.

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Let's place it here and rotate it such that it flows from pin 19 to ground.

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Let's edit, the text to state that this is a red led.

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Let's then add the resistor searching for r is enough and let's place it here.

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Let's edit the text and add 220.

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In the previous video we marked pin 19 to have no connection. Let's remove that now.

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We can now connect all the components with.

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We've just completed the schematic and are almost done. We only have to annotate the components and perform the electrical rule check. So, let's annotate the components.

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We can see that the resistor and led have automatically been assigned unique identifiers, and now we can perform the electrical rule check.

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Running the electrical rule check shows no issues, which means that we successfully created the schematic for the minimal arduino with an led before we connect the led to the microcontroller. We have to program it. We can place the atmega328 in a regular arduino uno and connect the arduino unit to our computer. With usb, we will open the arduino ide and in my case it opens in the program blink.

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If it doesn't, you can open it with the files, menu, examples, basics and blink.

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We are going to change blink slightly, let's copy the body of loop and add it to the end.

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Let's change these values to 500 from thousand milliseconds.

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This means that the arduino should blink for one second and for half a.

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We can then verify our program and upload it to the arduino. You can see that the led blinks for a second and then for half a second.

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This means that the microcontroller has been programmed. So let's pull it out of the arduino uno and use it for the minimal arduino.

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You can see the minimal arduino working here after we have connected this vcc and ground to a 5, volt power source.

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