What kind of decoder/encoder will work with these tx/rx modules? - Page 1
Forum section: electronics / rf-microwave

author: Beamin
author_rank: Super Contributor
timestamp: November 01, 2017, 07:15:57 am
content: So I found these little moduals. I saw a youtube video where you can put four switches on the tx and light four leds on the RX depending on the switch that's what I'm looking for. So I can make a low power long range pair that will teach me about antenna building.I found a chip that goes with it: (HT12D HT-12D + HT12E HT-12E) IC Remote decoder encoder(CY14). Unfortunately I can only find this chip from China or india and I am probably moving so I can't wait 1-2 months. I'm in the US. Can you just put any data into the pin on the tx and as long as it's below a certain baud rate it will just modulate and transmit it? Also I'm trying to stay away from surface mount last time I ordered these little transmitters they were way too small for my soldering abilities.Very little info on this other then generic ads.What are substitute chips that will work for this receiver/tx pair? I didn't know they had matching en/de coders. Is that what they are called? Are they only used in this application?._____________________________________________--Product Specifications:Technical parameters of the receiver:1.Product Model: MX-05V2.Operating voltage: DC 5V3.Quiescent Current: 4mA4.Receiving frequency: 433.92MHZ5.Receiver sensitivity: -105DB6.Size: 30 * 14 * 7mm7.External antenna: 32CM single core wire, wound into a spiralTechnical parameters of the transmitter:1.Product Model: MX-FS-03V2.Launch distance: 20-200 meters (different voltage, different results)3.Operating voltage: 3.5-12V4.Dimensions: 19 * 19mm5.Operating mode: AM6.Transfer rate: 4KB / S7.Transmitting power: 10mW8.Transmitting frequency: 433Mhz9.Pinout from left ? right: (DATA; VCC; GND)https://www.ebay.com/itm/433Mhz-RF-Transmitter-and-Receiver-Module-link-kit-for-Arduino-USA-seller/122345523978?epid=1279635964&hash=item1c7c5c8b0a:g:24kAAOSwHaBWlXJ8__________________________________________________________HT12E HT12D Encoder Decoder Pair

author: Mjolinor
author_rank: Frequent Contributor
timestamp: November 01, 2017, 07:23:27 am
content: You will not get the range or reliability you desire using AM modules unless you put a lot of effort into data protection and recovery. The FM ones are much more stable and easier.These things do not like DC content in the data so you have to encode with Manchester coding or some other method of removing the NRZ present in ASCII.There are much better ones available for not much more money but it is a large area to learn and the only way is to buy it then bin it and buy a better one.

author: Beamin
author_rank: Super Contributor
timestamp: November 01, 2017, 08:24:43 pm
content: Quote from: Mjolinor on November 01, 2017, 07:23:27 amDo you know what I should search for? They are only a few dollars each. What would we be cool is to make super low power fox hunt modules where you have to put a lot of time into finding them.

author: xaxaxa
author_rank: Regular Contributor
timestamp: November 02, 2017, 01:57:54 am
content: you can consider single chip transceiver modules like cc1101 where you feed it packets over an spi interface; these are fairly cheap on aliexpress and will give you much longer range than the AM transceiver modules.If you want even longer range use the ax5043 plus a frontend (saw filter, LNA, PA, tx/rx switch); you can get 10km+ with line of sight and very little antenna gain. GSM amplifier chips are very cheap on aliexpress (search acpm-7868) and can operate into the ISM bands but be careful to throttle it back to legal output powers as they will do 3W by default.

author: Beamin
author_rank: Super Contributor
timestamp: November 03, 2017, 04:25:45 am
content: Quote from: xaxaxa on November 02, 2017, 01:57:54 amCould I get a simple decoder/encoder chip pair to work over SPI? I was reading about how to do this with an Arduino but it involves adding libraries and seems likes its a bit above my level. Unless there are simple example sketches. I have a pair of Arduino nano or what ever they call the super cheap 2cm by 6cm units. The software end usually frustrates me that's why I like building the hard ware and just copy/paste the programing. These seem like a lot more flexible option I will try as well provided I can find some example projects.

author: MarkF
author_rank: Super Contributor
timestamp: November 03, 2017, 06:57:35 am
content: How far do you want to go? The nRF24L01+ chips maybe what you're looking for. There are several varieties (with or without external antennas). They have a SPI interface and one can talk to multiple others. Supply voltages up to 3.3V. DO NOT USE 5VDC!https://www.amazon.com/Makerfire-Arduino-NRF24L01-Wireless-Transceiver/dp/B00O9O868Ghttps://www.amazon.com/MakerFocus-NRF24L01-Transceiver-Antistatic-Compatible/dp/B01IK78PQA/ref=pd_bxgy_147_3?_encoding=UTF8&psc=1&refRID=8QN6RTH5NC3KTCRJFH3Z

author: JimRemington
author_rank: Regular Contributor
timestamp: November 05, 2017, 04:00:03 pm
content: QuoteThe PT2262/2272 are the functional equivalent of the HT12 chips, and are readily available.You can buy pushbutton transmitters and matching receivers from Adafruit or eBay.https://www.adafruit.com/product/1095https://cdn-shop.adafruit.com/product-videos/1024x768/1095-02.mp4