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10 years, 5 months ago.
simple RF system
Hi, I want control two motors with RF system. Using this system: http://dx.com/p/433mhz-rf-transmitter-module-receiver-module-link-kit-for-arduino-arm-mcu-wl-green-220194 on the receiver device can I mount only power system, rx module and motor controller? The motor controller is a MDSMC (micro dual serial motor controller by pololu). On the TX I use an mbed to read thwo joystiks and create the correct packages for the motor controller.
3 Answers
10 years, 5 months ago.
One issue with the transmitter and receiver modules at the link above is that they use OOK (on-off keying). The receiver is super regenerative, so there is a lot of hight frequency noise on the output when the transmitter is not transmitting (there is no squelch).
To use these, the transmit end needs to send some coded message for the receive side to decode before any information is passed further down the line. One such encoder/decoder IC pair is PT2272/PT2262.
I was going to do something with these type modules but after buying two pairs and seeing the same thing, I didn't end up using them.
Although I never completed that project, I expect to sometime soon. I now plan to use the Nordic Semiconductor nRF24L01+ (or some equivalent) because it offers a much higher data rate, which for my application, should work out better anyway. This chip is also a transceiver, so there can be bidirectional communication. And lastly, these can be picked up for about the same cost on eBay as the OOK 300-400MHz data modules that are one way.
10 years, 5 months ago.
Hello Davide, you also need a mbed on the receiver side. Using such cheap RF devices is like using a serial line. The transmitter have to transfer commands and the receiver has to decode and do the motor control. See https://mbed.org/users/4180_1/notebook/ir-and-rf-remote-controls/ for details.
Be carefull with china modules - you have to meet the national regulations. In most cases - If you have no HAM radio licence - you have to use modules with a approval ... These modules have only some meter range, so nobody will be harmed.
Regards, Peter
10 years, 5 months ago.
Thank you!
Did you finish this project?
posted by Alan Silva 23 Jan 2018