I've had a 433Mhz shield for a couple of years and never seemed to have much success with it. Todad I got the device out of the deep freeze and had another go. I have at least 2 433 devices in the house, one is a Scientific Oregon basic weather station the other an Efergy household energy monitor. I had visions of figuring out the Efergy protocol.
To cut the story short when I turn every device I can find off - this includes the 433 devices and most of my computing equipment (especially WiFi et) but I still get a string of pulses from the device. I've cut it down to just the shield, a 5V power supply and a HP 100Mhz CRO and it never changes. I get a consistent rapid collection of 3V pulses from the device. Removing the antenna or touching the antenna connection makes no difference to the pulse trains (probably shouldn't vary the amplitude) but I thought it might change the pulse trains.
Should I be getting any output from the device with no 433Mhz transmitters anywhere in the vicinity? I have a sketch which just counts the pulses and I get appoximately 1500 pulses / second.
315MHz and 433MHz wireless connections are very commonly used by consumer electronics including weather stations, home automation remote controls, power consumption meters, car alarms, and also many DIY projects.
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