433MHz superheterodyne transmitter and receiver modules. (my bad)

[Poty]

Good evening.
I´m trying to establish a link between 2 microcontrollers (PIC 12F508), using cheap RF modules (Those used with arduino), and bought 2 kinds of them.... a FS1000A with its receiver and a WL102 341 (superheterodyne) with its receiver.
I know... a lot of people will strt yelling "USE AN ADVANCED MICRO, WITH AN UART!!!!"... and I´ll agree with all of them... but I only have 15 x pic 12F508... so, it is the one that I´ll use.
Best of all, I was able, (with de FS1000 couple), to interconnect 2 protoboards till 3m distance, and using 3 different on/off switches with the transmitter, and 3 different leds in the receiver.
I have to recgnize that I don´t know even a little about radio transmission, only the use of a carrier frequency, and the ASK/OOK protocol which simplifies the data transmission. That´s all.
So, with this equipment, started to try different frequencies of data transmission over that carrier, using the NEC (infrarred led remote control) protocol, and IT WORKED with the FS1000 couple, on a distance up to 3m... Then, when trying to enhance this, stopped working and never connected again... Well, I have 3 couples of each pair, and tried to make it work again, and nothing... So I decided to use the WL102 couple... and worst... Not started even once.
As a try, I conected microcontrollers directly, to evaluate discrepancies between emitter and receiver programs (frequencies, etc), and all was ok, so I discarded problems with the programming step. Of course, there is always a variable, which is the time lenght of each transmitted pulse, wich can affect the performance of the couple, and I´m testing this right now... But just in case any of you had tried this before, and have a suggestion (besides the UART thing), I´ll accept and thank any one.
I´m trying to make it work with 3.3V, and later use higher voltage on the module that accept this.
Of course... you´ll tell me "just buy some TX/RX devices from amazon for a couple of bucks"... and yes, if I were in a first world country, I´ll just don´t even hesitate in doing that... but here, in the 6th world, I have to buy one of those (for only one channel) in around U$S24.50... which is a robbery...
So, thanks in advance.
Regards.

[ero]

Most probably your problem is the level difference between 3,3V logic and 5V logic.

Check the following link and try to make or buy similar circuit.
https://www.sparkfun.com/products/12009
You can look for also some simple solutions made by some resistors and transistor also. There are a lot in internet.

https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.gadgetronicx.com%2Flogic-level-converter-5v-3-3v%2Fvoltage-level-converter%2F&imgrefurl=https%3A%2F%2Fwww.gadgetronicx.com%2Flogic-level-converter-5v-3-3v%2F&tbnid=F2Q_htzDGnnvWM&vet=12ahUKEwi5_onIjb_8AhXUxwIHHfI-CdwQMygEegUIARCaAQ..i&docid=9XrSXhdD3afswM&w=768&h=629&q=level%20converter%205v%20to%203.3v&ved=2ahUKEwi5_onIjb_8AhXUxwIHHfI-CdwQMygEegUIARCaAQ

Ero

[pushycat]

FS1000A module TX works on a wide voltage 2.5v to 12v, but even for testing use the module on the same voltage used for the interfacing microcontroller. (5V) But the same gives best range on 9-12 volts . On the Receiver module, 5v is mandatory.

[titi]

Hi Poty,

here is some advices using cheap RF modules.

http://www.romanblack.com/RF/cheapRFmodules.htm

Best regards.

[jackjames]

I have used the HC-12 module with great success.
It is an RTX with more than 100 channels and can be programmed with AT commands.

https://it.aliexpress.com/item/32805756453.html?pdp_npi=2%40dis%21EUR%212%2C52%E2%82%AC%212%2C09%E2%82%AC%21%21%21%21%21%40211b80c216843454258023950e0001%2112000031355642123%21btf&_t=pvid%3A7dd7e899-0413-4d2f-8dfc-c65141c8ee34&afTraceInfo=32805756453__pc__pcBridgePPC__xxxxxx__1684345426&spm=a2g0o.ppclist.product.mainProduct&gatewayAdapt=glo2ita

[Poty]

Thanks for you suggestion. I was checking it on Ali Express, and seems to be a nice RTX, but looking for it in here, in this country, the price is crazy.... Almost U$S 50 Each one.. Not a good medicine...
Besides that, what are for those parameters following the URL of Ali Express and the ht12 (marked in red)?

https://it.aliexpress.com/item/32805756453.html?pdp_npi=2%40dis%21EUR%212%2C52%E2%82%AC%212%2C09%E2%82%AC%21%21%21%21%21%40211b80c216843454258023950e0001%2112000031355642123%21btf&_t=pvid%3A7dd7e899-0413-4d2f-8dfc-c65141c8ee34&afTraceInfo=32805756453__pc__pcBridgePPC__xxxxxx__1684345426&spm=a2g0o.ppclist.product.mainProduct&gatewayAdapt=glo2ita

[Parmin]

Sorry if my reply is out of topic but I think this could help solve your problem.

I gave up with the common 433 MHz or 325 MHz modules and now solely use NRF24L01 modules from ebay or such.
I find NRF24L01 are cheap and give awesome range with ease of application.

[pickit2]

Sorry if my reply is out of topic but I think this could help solve your problem.

I gave up with the common 433 MHz or 325 MHz modules and now solely use NRF24L01 modules from ebay or such.
I find NRF24L01 are cheap and give awesome range with ease of application.

Also look for NRF24L01 plus SMA Antenna 2.4 GHz 1100M & NRX6M2 you can find all 3 for very little money.

[Poty]

Nice suggestions! NRF24L01 is a pretty effective RTx... In fact, I have 4 modules, 2 with SMA antenna, and 2 with onboard ones. But I didn´t tell you all the story. I´m trying to make those work with a PIC12F508, which has only 8 pins... and NRF needs 4 or 5... which make it unusable in this project. It is intended to make a remote control from one TX to multiple RX, and then command lights, or whatever I want... and using NEC protocol. In fact, I made it work until 3m(10ft) distance... But I want more distance, to make something really useful...
Regards.

[Parmin]

With the CE and CS line tied to the supply, you only need 3 pins to control SCK, MISO and MOSI lines.
12F508 should be able to control this, I think.
This I have not yet tried so I might be wrong.

[Poty]

I agree, but there is another issue.... program memory.. 12F508 is almost the smaller one that you can get on 12F series.... Anyways, I´ll try. Thank you.

[Parmin]

Looking through my past work, I found that rather than standard serial transmission, I tend to use a modified Manchester coding to carry the signal across with an old 315 MHz transmitter and receiver.

I used 15ms of high signal as a "1" and 5ms as "0" and read the code at 10ms time slot.

I would send $AA as preamble then a series of codes to ensure that the right transmitter goes to the right receiver.
Then a short payload of not more than 10 bytes.