The previous post was about JeeNode and receiving KAKU commands. The nodo-domotica solution is also able to handle KAKU commands. I tried the Nodo sketch together with my Arduino Mega and an Aurel 433Mhz RX module bought from Conrad.
The module I used was the RX-4M50RR30SF (433mHz 5V – 102DBM – AM receiver). The productnumber at Conrad.nl is 190264 and it can be found here.
The Nodo schematic shows that Arduino digital pin 2 is connected to the data-out pin of the RX module and that Arduino digital pin 12 is connected to the +5V pin of the RX module. The module’s GND pin is of course connected to a GND pin of the Arduino.
Looking at the photo above you see 8 pins instead of 3 pins; that’s because there is a pin for the antenna, 2 extra GND pins, a test pin (I don’t know how to use this) and an extra +5V pin. I connected all the three GND to the GND, the two +5V to pin 12 and the antenna pin to a approx. 17.5 cm piece of copper.
The nodo website mentions an antenna length of 15 cm but I already found some text about antenna lengths for 433Mhz signals mentioning the 17.5 cm. In close range both will work and that is what I have tested until now. It is also possible to buy a real antenna.
I was very happy to see this piece of hardware work. Before I tested this RF module I tried another module (QAM-RX4-433 from Ideetron.nl) which didn’t work in combination with the Nodo software.
More things to sense …