Wanna to make interphone with Arduino? This module makes everthing simple.
With foldable antenna, this device could work over 1km in open area. The antenna could be extened as 45cm.
There is an external MIC on the board. It works while the earphone jack is unloaded. If the earphone is plugged in, the external MIC is disabled. Note that the earphone jack has 4 poles. So use could plug in earphone with Mic such iPhone's or Samsung smartphone's. As earphones from Apple and Samsung are different, the earphone switch was added to make it compatible with both. While the earphone is unloaded, you could also manual disable external MIC by setting the earphone switch to A.
If necessary, a speaker could be connected to the 4-pin header. There is a 2 channel 3W amplifier chip on the board. And the 4pin header is the output of the amplifier.
There is a switch on the board to setting the consumption. That means, it would affect the working distance. By default, the setting is HIGH (you don't have to bridge right two). By bridging the left 2 pins (L pin and the middle pin), the power consumption is lower. And the working distance is around 530m.
The device would draw large current. So the Arduino might get hot.
The module is designed for Arduino UNO/Duemilanove. You only need to plug in and play.
Please visit our Github page for the liarary
