Customizable RF frequency Generator and receiver
kowshik1729 last edited by
I would like to know how can we generate RF waves with customizable frequency. For example the generic RF modules which we get in the market operates at a frequency of 433MHz. But I wanna make a transmitter and receiver pair that can operate on freqeuncy that can be customized by me. How can I do it? Please guide me. Thanks in advance..!!
salmanfaris last edited by salmanfaris
This is an interesting question, Traditionally we are using mixers, filters, amplifiers, modulators/demodulators, detectors, etc to build a radio communication system and it's tightly coupled with hardware. And there are many types of frequency modulation like FM, AM, FSK, LoRa etc.
(Source : https://en.wikipedia.org/wiki/Radio)
To generate a different band we need to use a specific combination of mixers, filters, amplifiers, modulators/demodulator, also most of the scenario we only use a specific frequency to communicate in cost-efficient ways like 2.4 GHz for WiFi and Bluetooth but we use different modulations like GFSK in BT Classic and DSSS, FHSS in IEEE802.11 etc. And building many different combinations of mixers, filters, amplifiers are not cost-effective and economic.But using the SDR (Software Defines Radio ) we can achieve this,
A basic SDR system may consist of a personal computer equipped with a sound card, or other analogue-to-digital converter, preceded by some form of RF front end. Significant amounts of signal processing are handed over to the general-purpose processor, rather than being done in special-purpose hardware (electronic circuits). Such a design produces a radio which can receive and transmit widely different radio protocols (sometimes referred to as waveforms) based solely on the software used. (Source: https://en.wikipedia.org/wiki/Software-defined_radio)
So as an answer to your question, yes we can generate radio frequency but it's high cost and not economical, also with the help of the SDR system we can solve the issues.
You can also try SDR via online using https://eshail.batc.org.uk/nb/ , it was hosted at Goonhilly Earth Station in Cornwall, England.
@milanvarghese No, the battery comes into the play only if there is no power from the solar cell. It's like inverters in our home. They activate only if main power is gone, rest of the time they keep charging. similarly here the direct power will be coming from the solar cell, only if the solar cell can't produce enough voltage battery comes into the loop and starts providing voltage to our circuit.
@kowshik1729 I have seen this, but doesnt it damage that battery? dischargeing and charging at the same time?
@milanvarghese Basically you have cited the solution to your question. yes, you can run the Arduino microcontroller from a solar panel with some protection circuitry in between. There are many tutorials and blogs out there. You can start with something as following.
Hello I am working on a project using nodemcu.
In my home for years every day, someone has to walk up to the terrace of the house to check the water level and then turn the motor on/off.
I am planning to read the water levels in the tank using an ultrasonic sensor and push data into the cloud so that we don't need to go to the terrace to check the water level.
I would like my nodemcu module to run infinitely all the time using solar power. I have an old solar panel at home which is left unused and was used to charge a solar lamp. What other things do I need to implement this project? what battery should I use?
How do I implement this project?
@Mennyt The general right angled header pins are the cheapest option. Something like this https://robu.in/product/2-54mm-2x20-right-angle-male-header-strip-pack-of-2/?gclid=CjwKCAiA4o79BRBvEiwAjteoYDcmnOSwTUviMZzRBeHz_aENF_fQgj3BrKXAzYs6GIHknHSOJ4_2KhoC1fAQAvD_BwE