With the new RN-42 Bluetooth module we created a Bluetooth remote control board and transform it into an Android Based system: a board that manages input/output and it’s equipped with four outputs relays and four optically isolated inputs, that can be controlled via Bluetooth.

At the software layer, the unit sports three operation modes: manual, automatic and semi-automatic (between each shutdown and restart the last selected mode is kept in memory). In the first functioning mode, by using a special Android software, you can connect it to a mobile device and, by using special commands, you can enable and disable the relays and acquire and display the inputs status.

During the automatic mode, when the unit detects a, previously paired, phone within the BT range (the maximum number of devices paired is 5) it triggers a procedure to activates a relay (RL1 more precisely), which remains energized as long as the same device is out of range. This mode can be used in the same way as an RFID tracker: triggering actions on the base of proximity.

The third (semiautomatic) mode is similar, but differs in the sense that the proximity of a Bluetooth phone (also in this case the maximum number of devices Matching is 5) not directly activates a given relay, but gives the consent for the direct control of all relays (RL1, RL2, RL3, RL4) by means of a voltage level applied to the inputs: giving tension to an input determines the activation of the corresponding output. Basically input 1 acts on RL1, input 2 on RL2 and so on. In practice approaching the receiver with an enabled device, can trigger certain functions.

This project comes in  kit . Some components have to be soldered to the included PCB.

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