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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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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 …