I forgot to add, that as well as all the other benefits, the ETRX2 come with 16 digital I/O and 2 A/D inputs. The device can be set to wake up at a preset interval (measuring anything from seconds to hours) and transmit the state of the I/O pins as well as the A/D inut reading ( in the 0-1.2V range)Originally Posted by Chris Barron
I use this feature in one of my designs to measure the output from a thermistor via a voltage divider and the unit therefor transmits a value relating to the temperature. The unit can be made to sit in a low power mode in between transmissions, and that means that a couple of AA batteries could last for a couple of years.
You can leave the remote unit powered up all the time of course, and then you send it a simple command to return the contents of the 'S-register' which carries all the information about the I/O pins. You are also able to SET and CLEAR the I/O pins remotely. This sort of functionality means that if your application is very simple, such as a remote control device, you are not required to use a host processor as yoiu are with conventional 433MHz modules
I bought a batch of older AM/FM/ASK/FSK 433MHz transmitters and receivers a long while ago and don't imagine ever using them, now that devices like the ETRX2 are available
Bookmarks