DTMF Control Four Channel Relay Board
Need to control devices remotely - over the phone? Then you need our DTMF Control Four Channel Relay Board. This is a combination of an MT8870 DTMF decoder board and a four relay board.
- Each relay can switch 250V AC or 30V DC at 10A.
- Relay board requires a 12V DC 1A power supply.
- Board measues 50 x 80 x 18mm
Free delivery, worldwide.
How on earth does this be used?
You need a cellular or wired telephone that can automatically answer a call, and hang up once the originator has ended the call. Connect the included 3.5mm stereo jack cable from the phone's earpiece to the MT8870 module.
Now call the setup's phone from contemporary telephone. When the setup phone answers, you can press numbers on your phone, which will turn the outputs on and off.
You can choose if the keypresses cause a momentary, latched or delayed effect. This is done by bridging the solder pads at the bottom right of the board. See the chart below for modes and settings: