Tag Archives: 433MHz

Ultrastable UHF transmitter – A super Tiny Radio Transmitter

Dire situations require unpleasant solutions, an excellent example of this statement is spying and we have seen what the NSA has done in this regard. It goes against proper ethical character, however, it might be needed in certain circumstances. Usually, the first thing a person who wants to spy would do would be to check and closely monitor the internet presence or life of the party being suspected and possibly try to access their profile(s). You could also buy an expensive bug or listening device, plant it somewhere the person goes every day, this could be the person’s house and start eavesdropping.

Another method could be to hire a private investigator or a detective to monitor the person’s actions. However, if they are suspicions, you would probably want to do things discreetly. Going the professional route might work, but is also expensive and somewhat not fun to do (less of learning involved). Do It Yourself (DIY) is the talk of the day, why don’t we go that route? And it’s not like this will be the first time someone is doing that, I once did a project sometime ago that can eavesdrop conversation from a person behind a wall.

TomTechTod released an open source radio transmitter, which measures 5mm by 9mm and is powered by a small battery which has a 4.8mm diameter. This device is actually the smallest radio transmitter I have heard of, and it is super tiny, yet this 433 megahertz (Mhz) transmitter has a high-frequency oscillator and a low-frequency amplifier to ensure maximum efficiency no matter the condition.

Other features include the microphone, the battery holder, two transistors, a resonator too. There is also an antenna with a wire and a resistor. The board is 0.8m thick and can transmit up to 120 meters even with obstacles in the area.

One great advantage that comes with going for a super tiny board such as this one is that the PCBs are not expensive thereby making the board super cheap. The boards are being sold for just 45 cents each.

Files needed to create your own transmitter can be found here, with just a bit of soldering here and there, you have your very own spy bug. A super tiny one to be precise. Of course, I am not encouraging you to start spying on everyone you see I am just saying you should go and have fun.

Arduino 433Mhz RF Wireless Data Transfer

runtimeprojects.com has a tutorial on how to use 433Mhz modules to communicate between 2 Arduinos.

The most practical and cool way of sharing data from 1 Arduino to another is by far using a radio transmitter and receiver. The simplest form of wireless transmission (I could find) is the 433Mhz ASK modules. They come in pairs, a receiver and a transmitter. They are ridiculously cheap, selling at $1 or less a pair!!

Arduino 433Mhz RF Wireless Data Transfer – [Link]

433MHz wireless module configuration

pic-hc-12-433mhz-wireless-module-600

Dziku discuss how to configure a cheap 433MHz wireless module for serial communication:

HC-12 are cheap 433MHz wireless serial port communication modules with a range up to 1800m in open space. Each costs about $5 when bought from China, and 2 of them can create wireless UART link that can be used, for example, to transfer telemetry data from UAV. Or drive IoT device. Or connect sensors. Or whatever else one can think of.

433MHz wireless module configuration – [Link]

HC-12 433MHz wireless serial communication module configuration

HC-12-433MHz-wireless-module-1024x651

HC-12 are cheap 433MHz wireless serial port communication modules with a range up to 1800m in open space. Each costs about $5 when bought from China, and 2 of them can create wireless UART link that can be used, for example, to transfer telemetry data from UAV. Or drive IoT device. Or connect sensors. Or whatever else one can think of.

HC-12 433MHz wireless serial communication module configuration – [Link]

How to do serial comms using the cheap RF 433/315 MHz modules

RFmodule_pinout2

RomanBlack.com explains in details how to use 433/315Mhz modules for serial communication.

These cheap RF modules usually come in a pair, with one transmitter and one receiver. A pair can be bought on ebay for as cheap as $4, and even as cheap as $2 a pair if you buy 10 pairs.

Much of the information on the internet from people’s projects is sketchy and not very comprehensive. I test these modules out, and show how to get good reliable serial comms direct from USART -> USART, and I also show how to greatly speed up the data rate and reliability by using an alternative bit encoding system.

How to do serial comms using the cheap RF 433/315 MHz modules – [Link]

How to Use Arduino and a RF 433 Long Range

FE4ZO22IOKBXPR9.MEDIUM

This is a tutorial on how to use a 433MHz long range transmitter/receiver with Arduino.

I just explain how i have use the 433MHz RF Long Distance Transmitter / Receiver Pair and a arduino to install it on my rc truck for a firework ignition, lamp , pan tilt camera system

How to Use Arduino and a RF 433 Long Range – [Link]

Arduino 433Mhz RF Wireless Data Transfer

transreceiver-433mhz-300x300

Here is a tutorial on how to use 433MHz RF modules to send data from an Arduino to another. The example code transmits a message to the serial port of receiver.

The most practical and cool way of sharing data from 1 Arduino to another is by far using a radio transmitter and receiver. The simplest form of wireless transmission (I could find) is the 433Mhz ASK modules. They come in pairs, a receiver and a transmitter. They are ridiculously cheap, selling at $1 or less a pair!!

Arduino 433Mhz RF Wireless Data Transfer – [Link]

Wireless communication between two Arduinos using inexpensive RF modules

Title-580x294

Raj from Embedded Lab has posted a new article exploring an easy wireless communication setup between two Arduinos using low-cost ASK RF transmitter and receiver modules. He used a 433MHz Tx/Rx pair with two Arduino boards to illustrate how to construct a low-range wireless temperature and humidity monitor.

Wireless communication between two Arduinos using inexpensive RF modules – [Link]

ATMEGA328 based Weather Station

IMG_1715-904x602

Vlad @ denialmedia.ca has build a solar powered weather station based on ATMega328 microcontroller that is able to measure temperature, a humidity, and UV radiation and it uploads measurement on WeatherUnderground network. The data are send to the air using a 433MHz link. The sensors used are DHT22, ML8511, BMP180 and a TP4056 charger IC is used to charge the Li-Po battery from a solar cell.

ATMEGA328 based Weather Station – [Link]

Decoding and sending 433MHz RF codes with Arduino

F2EWRTTIF9UABZ7.MEDIUM

by liwenyip @ instructables.com:

In this tutorial I’ll show you how to use an Arduino to decode signals from RF remotes, and re-send them to remotely control some mains switches and a garage door.

Decoding and sending 433MHz RF codes with Arduino – [Link]