Raspberry Pi of Goemon

Raspberry Pi3 learning blog

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AD converter: LED responsive to room brightness

If you use a toggle switch, it’s enough  that you just monitor the HIGH/LOW signal. But what about monitoring brightness/darkness? If you allocate “0” to the night as it’s dark and “1” to the noon as it’s bright, what would you allocate to the morning and evening? Maybe you have no solution because brightness/darkness is not digital value, which can be expressed 0/1, but analogue value. Analogue value is infinitely continuous. For example, there is 0.5 between 0 and 1, there is 0.25 between 0 and 0.5……. But if you want to handle those analogue values with computer, what do …

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How to deal with switch bounce

2016/10/04   -Beginner, Electric work

Today, I will deal with switch bounce. Then I will toggle the switch to control LED (OFF/ON). Now let’s start! Table of contents Switch bounce Bounce time Code Result Reference 1. Switch bounce Switch bounce is a phenomenon that occurs when you use a physical contact switch such as a tact switch. When you push a switch, you may think it gets immediately ON. However, that’s not correct in the micro-scale world. When a switch is toggled, metal contacts of a switch come together and close. During this time, metal contacts are bouncing and that causes noise. This noise is …

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Utilize an internal pull-down resister

In the previous post, I checked how a pull-down resister functioned. When it’s there the system worked as expected. However once it’s taken off, then LED became unstable. Actually, Raspberry Pi 3 contains an internal pull-down resister and you can enable it by coding. Today, I’m gonna show you how you can enable an internal resister and how it works. Don’t worry, it’s very simple 🙂

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Control LED by tact switch

In a previous post, how to blink LED with Raspberry Pi 3 was introduced (Blink LED on Raspberry Pi 3 ). In this work, I just got an “output” from Raspberry Pi. Today, I will send an “input” to Raspberry Pi by using a tact switch.By sending an input, you can get Raspberry Pi to send an output. With this work, you can turn on/off your LED with a tact switch. Table of contents Tact switch Hardware setup Code Result Reference What you need You may want a nipper to cut the legs of resister if they are long. Name Qty Resistor …

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How to use your tablet/smartphone as screen

2016/09/27   -Beginner, VNC
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Raspberry Pi is small and portable in itself. Also you can easily carry a charger for it. However, you are unlikely to carry a screen with you. It’ll be super convenient if you can use your smartphone/tablet as screen for Raspberry Pi. Today is about how to make your tablet/smartphone screen for Raspberry Pi. Please note that this method is possible only when both of your mobile devices and Raspberry Pi are connected to a same network. Table of contents Check Raspberry Pi IP address Set up SSH Install & set up VNC server on Raspberry Pi Install & set up …

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Blink LED on Raspberry Pi 3

Blink LED is a very first step for beginners. You can learn how to connect each electric component and control it with minimum numbers of components and a small chunk of code. Table of contents GPIO pin layout Hardware setup Code Result Reference The necessary parts and tools are here. The selection of resistor depends on LED’s Vf (forward voltage). You can usually find the value on its specification/catalog. Name Qty Resistor 1 330 Ω Red LED 1 Vf = 2.0 V Breadboard 1 Breadboard jumper wire (male-female) 2 Nippers 1 1. GPIO pin layout GPIO (General Purpose Input/Output)  is an …

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Install Raspbian on Raspberry Pi 3

2016/09/17   -Beginner, Raspbian
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The very first thing you have to do is to install OS on your Raspberry Pi. Today I install Raspbian on which various programs for learning are available. Table of contents Format SD card Download NOOBS Hardware setup Raspbian installation & setting Connect to Internet OS update What you need Micro SD card (larger than 8GB) *class 10 is recommended PC connected to Internet Mouse Keyboard Micro USB power supply PC monitor (HDMI or DVI-D) Monitor cable (monitor <=> Raspberry Pi 3) 1. Format SD card If your SD card is new, you can skip this step. Mine was used …