Sign In Register. Quick Links Categories Recent Discussions. Categories Ron Czapala Posts: 2, Parallax Key Fob remote I suppose I could experiment with this but decided someone might know the answer immediately, for maximum range, should the coiled antenna be uncoiled or left coiled?
I did determine the VT pin goes high when any of the buttons is pushed. I wonder how many milliamps the outputs can handle - I suppose using a transistor or ULNa would be the safest approach.
EDIT: Opps! The antenna wire should be Found some more information on the receiver and ways to set it for Latch, Momentary or Toggle modes with jumpers Output A. Ron, that formula you found is an approximation. In a situation like this, where you're not working with a ground plane anyway, it's good enough. These small antennas can be very weird depending on what else is around that conducts electricity.
For best range it should be sticking up vertically from a nice ground plane. Clock Loop Posts: 1, After I purchase another key fob, and hope it works this time, I will scope it out to determine second smaller IC type, and then repair it.
More images of possible chips I ordered one of these and it arrived bad, the little IC gets too hot to touch, and because they purposefully erased the ic type, I cannot try to repair it.
I am forced to rma it and waste all that cost in shipping And it pisses them off so much, they WILL completely reverse engineer it, and then purposely compete, for the principal. The smaller chip is as such. I think its a pic chip. It decodes the data from the rx chip and outputs the lines. You can see this if you probe pin 13 of the smaller ic while pressing one of the remote buttons.
The data looks sharky when free floating. And datasheet on dataout from the bigger chip, rxa, shows pull resistor. This smaller chip also accepts input from big button, and outputs indicator led state. Top view Dot in upper left chip. Now you know why the faces were rubbed off. Easy bypass of all other parts direct desired microcontroller interface to rxa, in all applications.
I would have never even cared and stopped, when I saw the chip was a pic with a program, I wouldn't have tried to find out what chip the bigger one was, or even looked at it much.Pages: . Fulliautomatix Sr. Increasing range on a Mhz transmitter.
Hi, I'm using this keyfob transmitter Everything works fine except for one teensy problem - range.
The manual says the range is "up to 25 ft" about 7m - I need a range of about 6 meter so this ought to be fine but in practice at 6 meters operations is intermittent and inconsistent. What can I do do boost range - even by a little bit? Despite what the manual says, the transmitter seems to use a PT chip. Perhaps I should add some sort of short antenna?
Would this help? Or is there a simple way of boosting the performance of the receiver? To pre-empt any questions about why distance is so critical I'm using one keyfob to control two motors, and they have to be 12 meters apart, so I need to stand mid-way in-between the pair to control them both. Currently I need to walk a couple of meters to the left to control the left-hand motor, and then a couple of meters to the right to control the right hand motor.
Ideally I'd like to be able to control them both without the need to move! Re: Increasing range on a Mhz transmitter. Range is largely a function of antennas.
Key FOB Remote more info - 315Mhz vs 433Mhz
Quote from: Fulliautomatix on Sep 12,pm. If I'm not mistaken, the RF portion of those is the garbage superregenerative design like the cheap green OOK receivers, just piped to that chip to decode it. Those receivers are garbage the problem is the receiver, not the transmitter - I tested a bunch of transmitters, and a bunch of receivers. The transmitters made much less difference than the receivers.
Amateur radio sinceapproximately. Live in Central Oregon desert. When using the FOB, you are the antenna. So only solution is in the receiver. Better antenna or better receiver, or both. I think that replacing the pigtail aerail on the receiver with a DIY sleeve earial is the easiest solution. Gently push the ground braid backwards over the cable.
It only takes a minute to sign up. It appears that you cannot choose. The part on the image you show us, says "BX RA". Here is one that says "BX RA":.
So this module probably sends on the frequency showed on the metal can. Now it's your job to get the right one And yesit does matter when you send at MHz and the receiver listens at MHz. Your transmitter and receiver should have the same working frequency, or nothing will happen. Those will most likely be two different versions of the same module. It's either MHz or MHz, not both. A different crystal frequency is used to define the type.
Therefore, the receiver is compatible with transmitters of different frequencies. On the other hand, the transmitter has a fixed frequency, which is stamped on the metal casing.
Sometimes the sellers shipped transmitters of one frequency when you ordered another.Download cracked android apps apk
So, you need to tune the receiver frequency with your own software. Networks of different frequencies cannot talk with each other. Receiver should not be powered by power pins from the micro controller. They should be powered by separate external power source.
Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 7 years, 1 month ago. Active 7 days ago. Viewed 8k times. Now i wonder: what does that mean? What you might have guessed: it does not produce the desired result yet :- EDIT: does it matter when i send at mhz and the receiver is at ? Michel Michel 1 1 silver badge 5 5 bronze badges. Active Oldest Votes. Here is one that says "BX RA": So this module probably sends on the frequency showed on the metal can.
Good luck! A Johan. A 1, 1 1 gold badge 13 13 silver badges 25 25 bronze badges.Pages: . Read times previous topic - next topic. But since I'm a beginner, I tried first to test the RF transmitter and receiver to control two motors. I did a very simple set-up. However, I'm limited to about 6 to 12 inches of range only. Beyond this distance, there is no more response or sometimes erratic response from the receiver. I tried to install an antenna on the transmitter but it just did not work.
I don't know if i got the antenna connection correct. On the receiver, there is no label for antenna connection and i could not find documentation on the receiver that could indicate proper connection. Can anyone please help. I have attached the pictures of the actual setup and transmitter and receiver.
Receiver Back. Receiver Front. Transmitter - Back. Transmitter - Front. Was able to find a seller in eBay with my needed information, antenna location and length of wire. Although it was for a transmitter-receiver with Mhz, the chip resembles that of the Mhz that I have. I formed a coil and soldered each to the transmitter and receiver. With these, the range was increased to 5 meters.
At distances greater than 5m I get erratic results. First, you are likely to get better results with a straight antenna. For mhz, the length you want is There are tuning issues with a coiled antenna. The antenna connection point on the receiver is the solder blob at the lower left corner of your picture. Next to the copper coil.Hindi web series list 2019 download
First, I used a mono-pole straight antenna with it and used the transmitter to send data to receiver! The transmission and reception was working for quite a good range.
Next, I thought of attaching both the receiver and transmitter to my two microcontroller modules. I did this so that when my Master Transmitter would transmit some data, then my Slave receiver could acknowledge him back too that the data had been received successfully.
After I programmed it that way it was still working fine. The problem came when I tested it's range which had reduced considerably. The range went to almost more than half as it was when I was using just a single transmitter and receiver.
My question is does anyone know what might be the problem as to why my range of data communication has reduced so much? And can anyone please also do give me some tips as to how can I resolve this issue? I have attached a picture of transmitter and receiver I am using! I would be very thankful If I could get some pointers on how to solve this issue! Scroll to continue with content.
So, each microcontroller has one of each: receiver and transmitter? If so, then your transmitter might be making the gain in the local receiver decrease since the signal source is so close and strong. If so, you could try transmitting the data several times, while the other transmitter is off, of course this is half-duplex, afterall in order to get the other receiver to get to the correct gain.
Roman Black just posted a rather interesting look at those little modules, you may want to take a look, here. Thanks for mentioning my page Tshuck. To Shamaas, re the drop in range after using both TX and RX at each end, how have you arranged the antennas? Are you running 4 stick antennas now? Or have you connected the TX and RX modules both to the same stick antenna? Photos would help! You must log in or register to reply here. Power measurement meter price range?
High voltage protection regulator - V range. Stabilisation issue in the negative range of my LM You May Also Like. Continue to site.
Circuit Simulator that has a wide range of series integrated series. Mar 22, Mar 12, Mar 9, Connectivity continues to be one of the most important features of any device in recent times, even for devices which are not directly connected to the internet, the need to send data from one device to the other is an important part of the ubiquitous world being built today. Short-range RF Transceivers like the MHz transmitters discussed in one of our previous post are very popular among DIY hobbyist and makers, however, their short-range was a bottleneck for users as they barely offer signal coverage for an area bigger than a standard room.
For instance, when VCC is 5vthe modules are able to reach m range in open space, as such, the range can be improved further by increasing the supply voltage. Two Arduino boards are required because we will build a complete system with a transmitter and receiver. As mentioned during the introduction, we will essentially build two projects. One will serve as the transmitter while the other will serve as the receiver as such, we have two schematics. The image of the short-range RF modules will be used since the connection is the same and the Long-range RF modules do not have a fritzing package.
The transmitter schematics is quite simple, we only need to connect a push-button and the transmitter of the MHz transceiver to the Arduino as shown in the image below. The pin-to-pin connection between the Arduino and the RF transmitter module is described below:. Go over the connections once more to ensure everything is as it should then proceed to the code section. The Code for this project is heavily dependent on the popular Virtual Wire Library.
The library can be installed via the Arduino library manager or by downloading the library from the attached link and installing it by extracting it into the Arduino Libraries folder. The Virtualwire library comprises functions that allow us to perform actions like set the transmission power of the RF modules, encode the data, etc.
With the library installed we can now proceed to write the code.
Range Issue of RF 315Mhz Receiver and transmitter using PIC18F4520 microcontroller!
Just like the schematics, we will write two sketches for this project; one for the transmitter and the other for the receiver. We will start with the code for the transmitter. As mentioned during the introduction the sketch for the transmitter will simply send commands a for ON, b for OFF to the receiver when off.
We start as usual by importing the libraries that we will use, which in this case, is just the VirtualWire library.
Long Range 315MHz RF Wireless Transceiver Kit
Next, we create variables that will be used to hold different data like the characters to be sent by the transmitter, the buffer length, and the buffer name. We also declare the pin of the Arduino to which the push-button is connected. With that done, we then proceed to the void setup function.
With that done, we move into the void loop function, which is where the real action happens. The void loop function comprises of two if statements which check the state of the push-button. The complete code for the transmitter is available below and also attached under the download section of the tutorial. Receiver Sketch. The sketch for the receiver is quite straightforward. When data is received from the transmitter, the receiver processes the data and issue commands turns the LED ON or OFF depending on the command that was received.
We start the sketch as usual, by including the library that will be used, which is still the same virtual wire library used for the transmitter sketch.
Next, we create variables buf and buflen that will be used to store the data received from the transmitter along with its length and also declare the pin of the Arduino to which the LED is connected. The void loop function is quite straight forward. If data was received, a select case statement is then used to compare the data that was received.Long range, 1.8km, Arduino to Arduino wireless communication with the HC-12
The complete code for the receiver is below and also attached under the download section of the project. Go over the connections once again to ensure all his correct then connect both devices to the computer and upload the sketch one after the other.Does a fish tank lid need holes
With the sketches uploaded, power both devices and press the push-button on the transmitter. You should see the LED connected to the receiver light up. The long-range RF modules provide an alternative way to implement cheap communication over somewhat large distances as such, it is worth considering for your low-budget, local network of devices project. Feel free to ask any question you might have about this via the comment section. A video of the project in action can be found on youtube.
Well, that is all very interesting, its quite simple with the proper boards. Thanks for the idea.Planning a visit to the United States? Or have friends and family in the U.
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