LoRa radio remote control (433 MHz) – assembled

Because the remote control is small and carries its own power source, it can be placed wherever a mechanically triggered sensor is needed. Add a small circuit acting as an ultra-low-consumption timer (a few nanoamps) and the pushbutton can be operated electronically, for example through a MOS transistor working as a switch. The unit could then periodically send the server an analogue value read on pin A2 or a digital value on pin D8. For this alternative use an enclosure of comparable size to the remote control one could be chosen, such as the G1013 (with some adaptation), if the pushbutton window is not wanted.

These alternative uses of the remote control all rely on the circuit being switched on only momentarily, as it is powered by a small non-rechargeable battery. A further development of the remote control circuit is, however, already being studied. This new small board, not far in size from the remote control one, will add a charger for 3.7 V LiPo batteries. The result will be a board complete with processor and radio module, able to power itself and to stay on permanently.

The system will then be able to listen for incoming messages or to originate its own on the back of alarms of various kinds. The number of analogue and digital pins available on the small board will also be increased.

In short, a family of three types of device is planned:
• a shield for Arduino (and therefore for RandA as well), intended for server duties or more elaborate stations;
• a small board able to power itself from a rechargeable battery, complete with Arduino processor (LilyPad type) and radio module, intended for remote stations, solar-powered ones included.
• the remote control/mechanical alarm presented in this article.

• Library