Using an ATmega 2560 and therefore the heart of Arduino, we have developed a universal remote control with GSM. This allows  to control 2IN/2OUT, DTMF key, gate control and GSM thermostat activated remotely.

We have already presented several remote control with different functions.
But now we want to present the best remote control ever made with Arduino.
The remote control is easier, thanks …

Excellent to remotely control via GSM the activation of engines, lightening or watering systems and alarm systems. It sends commands through SMS as well as with DTMF dual tones and allows you to check if they were successful.
In this post we present the last application created from the development of the modular remote control we started describing in the issue …

Let’s now look into the schematic diagram; in it you can note the usual Microchip microcontroller governing the GSM/GPRS module activity, controlling the logical condition of the two opto-isolated inputs and managing the two relays. Moreover, the PIC interacts with the DTMF decoder in order to recognize the dual tones used for the phone selection in modern telecommunication systems; it …

On the construction perspective, the remote control does not present many difficulties, just the obvious ones that appear when working with circuits requiring superficial assembly components. As usual, there is a PCB with double plating where to mount all components.

The set of commands of this remote is divided into two categories: the SMS ones and the DTMF tones.
The former are simply summarized in the corresponding table, since they are the same as the ones described for remote 2 IN/2 OUT.
Here we will only describe in detail the DTMF commands, first stating that unlike those from SMS, that can be …

A modular solution allowing for the use of a single circuit for numerous functions, such as gate opening, bidirectional telecontrol, and many others. It adopts a newly-conceived low-cost GSM/GPRS module.
Nowadays, creating a remote control is much simpler and safer than it used to be, even if it is to be used from the other side of the world; what made …

Let us start by describing the device’s electric scheme in its entirety, that is, along with all its components; we should also state in advance that the module we call GSM is, in reality, the small board hosting the cell phone, so the pin numbers refer to the contacts of the pin-strips that have been used. In the next issue, …

Now that we are familiar with the structure and functions of the base circuit, we can look at how it is built; let us state in advance that its realization presupposes a double-layer printed board with metallic holes, a choice we made in order to be able to reduce the overall size of the device. As a result, you need …