Problems with 433 Mhz relays

[jpetep]

Hello,

I've been working with scoreboard project for teensy 4.1 , where have 433 Mhz garage door relay openers as remote controllers. For some reason those are not working with teensy as they should, range decreases very much when teensy is on. I have been trying different CPU speeds, but that doesn't matter. I have also I2C devices installed bmp180, ds3231 and aht10, and tried different clock speeds for I2C. I have also tried two different antenna, but no success. Does anybody has had similar problems?

Br.Petteri

 

[defragster]

Well packed box. Lots of metal, active parts and wires. Which part is the transmitter? Antennas placed within or outside?

 

[jpetep]

Upper left there are two transmitters with blue relays, other has two relays, and other has four relays, those has built in antennas with black helix wires, which I have extended with external antennas outside with 3M stickers showing in picture. Between those there is 5v to 12 v step up convertor. In previous versions I have also tested to put transmitter relays 20 cm above the box, but it didn't work either. With Arduino Mega everything worked fine. My opinion is that for some reason Teensy interferes with 433 Mhz signal.

 

[MarkT]

Because a 600MHz processor is a strong source of EMI if you don't take careful measures to contain it such as shielded enclosure and ferrites on cables.