The data sheets for those cheap 433 Mhz transmitter / receivers are a bit confusing.The 3 - 12 V spec applies to the Transmitter only.The receiver needs 5V regulated and the super regen receivers (the ones without a crystal) are the most critical , voltage wise.
What's confusing? The datasheet does clearly say 3-12V for transmitter and 5V for receiver. (4.9V-5.1V in my datasheet)I only mentioned powering the transmitter with 12V. I used 5V on my receivers, which suited the PIC chips that I used to control this system. (And the usual Arduino setup, of course, but I hadn't started using Arduinos when I built the alarm systems.)But you raise a good point that I overlooked - DrAzzy used 3.3V on both ends.
Not even, in some tests ;-)I got >800' (LoS) with 2.1v on the transmitter! (one of the cheap green transmitters, too - with a good receiver, ofc)
One last question, I'm using the cheap moisture sensor YL-69. It will be plugged on the arduino board of the receiver, it will send data every hour to a database. However, I know that this sensor get damage easily, so I want to power it only when I read the data (when it will send the data every hour). Do you have an easy way to do that ? I need to use a digital pin right ?
I just tried to find one on the internet but no luck so far. The name of this sensor is the YL-69.But the analog pin deliver 5V?
Oups, yes Steve I meant the digital pin, I didn't know it supplies 5V. I've edited my previous message, I found a source. I bought it in the chinese market directly at a small shop ^^And yes my sensor is the same with the comparator
Yes, sorry... I bought exactly the same than this one in the tutorial : http://www.instructables.com/id/Soil-Moisture-Sensor/?ALLSTEPSI'm new to this, I'm a bit confused too, I've started recently.
It could be damaged by corrosion, that's what I've seen a lot in other projects, a lot of people advice to do that from what I've seen.
I'll try what you said