We strongly encourage users to use Package manager for sharing their code on Libstock website, because it boosts your efficiency and leaves the end user with no room for error. [more info]
Rating:
Author: Shawon Shahryiar
Last Updated: 2016-02-25
Package Version: 1.0.0.0
Category: Communication
Downloaded: 688 times
Followed by: 1 user
License: MIT license
AVR-AVR RF communication using low cost RF modules.
https://www.youtube.com/watch?v=i6FnK8dfE74
https://www.youtube.com/watch?v=hmsoojNCE3k
https://www.youtube.com/watch?v=j92d6KPrgFM
Do you want to subscribe in order to receive notifications regarding "RF Relay Control" changes.
Do you want to unsubscribe in order to stop receiving notifications regarding "RF Relay Control" changes.
Do you want to report abuse regarding "RF Relay Control".
| DOWNLOAD LINK | RELATED COMPILER | CONTAINS |
|---|---|---|
| 1432834422_wireless_rf_rela_mikroc_avr.rar [17.63KB] | mikroC PRO for AVR |
|
There are various methods for sending data between multiple MCUs. Of these the most common methods are custom UART-based protocol, Manchester code and time slotting protocol. In time slotting protocol, 1s and 0s are sent as pulses with variable on time. Logic one is represented with 2ms high followed by 1ms low while logic zero is represented as 1ms high followed by 1ms low. Thus data encoded and decoded using these infos.
When idle, most low cost 315/433MHz RF modules receive ambient RF noise and so constant on/off signals are never recognized by them. However they seem to work properly with high frequency on-off signals. To reliably send data, bursts of relatively high frequency pulses are send out before broadcasting actual data and its CRC. These trigger the receiver RF module to reduce its gain and get ready to catch up data. After responding to these sync bits actual data and CRC are retrieved. The CRC is simply the logical AND of the actual 8 bit data and 0xAA.
Time slotting techniques just like Manchester code doesn't depend on whether a MCU has a UART or not. Any I/O pin can be used and the coding for such is not too large and complex.
