Switch that can be activated from remote via GSM phone call.
The A6 GSM module connects to the GSM network and wait for calls.
When a call is received, the circuit count the number of RINGs, and on the third ring it activates the switch.
The switch stays active for 15 minutes, then it's automatically deactivated.
WizLab.it
WizLab.it: https://www.wizlab.it/
GitHub: https://github.com/wizlab-it/gsm-switch/
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
To get a copy of the GNU General Public License, see http://www.gnu.org/licenses/.