Tag • #arduino

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Send data to weather station over 433.92 MHz (2)

pubsub.slavino.sk / onetransistor · Thursday, 13 January, 2022 - 18:49 edit

In a previous post I used a software defined radio (SDR) to analyze and decode data transmission over 433.92 MHz of a simple weather station. As I mentioned then, the indoor unit can receive data from up to three outdoor units. I found that outdoor units use basic OOK modulation to send data to indoor unit. Knowing this I can make my own outdoor unit using a 433 MHz transmitter module controlled by an Arduino.

Obviously, I had to use a temperature and humidity sensor such as DHT11, DHT22, AM2302 to get environment parameters. I emulated full original outdoor unit functionality by adding a display and a push button to trigger immediate transmission of data to indoor unit.

Send data to weather station over 433.92 MHz

Arduino based data transmission device

Značky: #Arduino, #Radio, #LPD433, #Elektro

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Update GRBL firmware on CNC 3018 Pro

pubsub.slavino.sk / onetransistor · Saturday, 4 December, 2021 - 20:49 edit

CNC 3018 Pro is a low-cost CNC router that should be used mostly with wood and acrylic plastic. It can also be used to mill PCBs and cut soft metals like aluminum with proper settings. The machine uses both metal and plastic parts. Electronics is based on a custom made ATmega328p board with A4988 stepper drivers. Spindle uses a common DC775 motor fitted with ER11 chuck.

I recently bought one from Banggood (I chose the version with offline controller because it allows me to load gcode from SD card and use the CNC without a computer next to it). To my surprise it came with an old version of GRBL firmware (0.9j) so I started gathering information about how I can update it.

Update GRBL firmware on CNC 3018 Pro

Značky: #Arduino, #GRBL, #CNC, #Elektro

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Progress indicator with addressable pixel ring

pubsub.slavino.sk / onetransistor · Thursday, 18 November, 2021 - 19:34 edit

Individually addressable pixel rings are WS2812 based RGB LED strips also known as NeoPixel strips. When interfaced with a microcontroller this strip can display any different RGB color on every LED it contains. They are versatile and can be used in a lot of projects. I bought a 24-LED LED ring which I originally intended to use to build a clock but until then I noticed it could make a nice progress indicator.

In the middle of the LED ring, I added a simple 4-digit 7-segment LED display with TM1637 controller. I opted for red display, yet you may use whatever color you like. Both display and LED ring, together with a buzzer are glued on a disc shaped piece of plastic. I could have 3D printed a better stand, yet the plastic disc does the job.

Progress indicator with addressable pixel ring

Značky: #LEDs, #WS2812, #Electronics, #Arduino, #Elektro

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Sending messages through Signal or Whatsapp

pubsub.slavino.sk / arduinodiy · Wednesday, 14 July, 2021 - 12:20 edit

Earlier I described how to send messages from your ESP8266 (or ESP32 for that matter) via the Telegram message app.Signal is a slightly less known app that is getting more and more popular and it is also possible to send messages from your microcontroller through that app. It is even simpler (in my humble opinion … Continue reading

Značky: #Elektro, #Arduino

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Parametric 3D Box and Lid

pubsub.slavino.sk / arduinodiy · Friday, 9 July, 2021 - 11:20 edit

Often, when doing a project, it stays i sort of a ‘experimental’ state coz of lack of a proper casing. I designed a universal box and lid in Freecad. It is parameter driven, which means you can just fill in the required measures in a spreadsheet and you are good to go. Mind you that … Continue reading

Značky: #Arduino, #Elektro

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Modifying the AsyncElegantOTA library…..or should you??

pubsub.slavino.sk / arduinodiy · Tuesday, 29 June, 2021 - 15:41 edit

The AyncElegantOTA library is an easy way to add WebOTA to your projects with well, uh an ‘Elegant’ interface. A recent discussion an facebook was about ‘how can I modify the AsyncElegantOTA?’ Ofcourse it is not so hard to do that if you know something about JavaScript and/or HTML, but one who dives into the … Continue reading

Značky: #Arduino, #Elektro

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50 Shades of Blink

pubsub.slavino.sk / arduinodiy · Thursday, 27 May, 2021 - 13:31 edit

Well, not really 50, but I will dive into various ways to make an LED blink, after all, if you can control an LED you can control a relay and if you can control a relay you can control the world. This article is mainly aimed at showing beginners various approaches to a specific functionality, … Continue reading

Značky: #Arduino, #Elektro

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Cold frame monitoring with an ESP8266 WebServer

pubsub.slavino.sk / arduinodiy · Monday, 19 April, 2021 - 10:54 edit

In this post i will describe a monitor for a Coldframe (that is sort of a small unheated greenhouse). It has the following functions/uses the following sensors: A HTU21D to measure humidity and temperature inside the coldframe. The HTU21D is a very stable easy to use sensor….but after it has been exposed to 100% humidity … Continue reading

Značky: #Elektro, #Arduino

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Strange behaviour in ESP8266 AccessPoint was password related

pubsub.slavino.sk / arduinodiy · Thursday, 25 February, 2021 - 21:01 edit

In my previous article, I made a skeleton program for a tutorial about the various ways of WiFi connection of an ESP8266, I ran into an odd problem that turned ourt to be related to the password.the code aimed to include both STA and AP connection and I set up the credentials like this. After … Continue reading

Značky: #Elektro, #Arduino

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