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Please note: Because this question is concerned with integrating a BlueTooth chip to a PCB and a remote device, I do believe this is an electronics question at heart.


I have an experimental/hobby project where I want to use a momentary switch like this one to communicate to an app running on either my (Android) Samsung Galaxy as well as my iPhone 7+. Anytime the switch is pushed down, I want my app (regardless of whether its running on my iPhone or my Galaxy) to be notified and react accordingly.

Unless anyone has any better idea, I'm thinking about using BlueTooth for the communication link, because iPhone's have now deprecated the use of 3.5mm audio jacks, and so BlueTooth appears to be the only platform-agnostic way I can send signals from my momentary switch to my app.

So I'm looking for a BlueTooth transceiver that would fit the bill here:

  • Will likely solder the switch and the BlueTooth transceiver to a PCB and power it externally (battery, not sure what the needs are there yet)
  • When powered on, I need the BlueTooth chip to start attempting to connect to any other devices (such as my phone) that are listening for a similar connection
  • Once a connection is made and the app (running on the phone) is listening, then when the switch is being pushed (closed), I want it to fire "a signal" to the BlueTooth transceiver/chip which would in turn then fire "a signal" on to the phone; the app would then respond accordingly

So my question: is there a BlueTooth chip (maybe such as these ones?) that can be integrated with a switch, and be used to scan for -- and connect to -- my phone in keeping with my needs above? Are there any "tricks" to configuring them or getting them to work with Android vs iOS devices?

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    \$\begingroup\$ Have you checked the links under "Related" section on the right? \$\endgroup\$
    – Eugene Sh.
    Oct 3, 2017 at 16:26
  • \$\begingroup\$ Thanks @EugeneSh. (+1) - the one that jumps out is this one but I don't think my question is a dupe of it because that other solution requires the device to be on a MCU board (like a RaspberryPi, etc.). My device will consist of: a power source (battery), a momentary switch, and a BT chip, and nothing more (unless BT demands/requires there to be more). \$\endgroup\$
    – smeeb
    Oct 3, 2017 at 16:35
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    \$\begingroup\$ shkspr.mobi/blog/2016/02/cheap-bluetooth-buttons-and-linux \$\endgroup\$ Oct 3, 2017 at 19:38
  • \$\begingroup\$ Thanks @BruceAbbott so is an MCU a requirement to run a BT transceiver? Meaning I'd have to put my switch and BT transceiver on a breadboard that was also connected to an MCU or something like a RaspberryPi? \$\endgroup\$
    – smeeb
    Oct 4, 2017 at 0:23
  • \$\begingroup\$ "AB1126A is an optimized single-chip solution which integrates baseband and radio for wireless human input device applications especially for remote smartphone camera control." - No need for an MCU or (gasp) Rpi - just buy a Bluetooth Button, wire your switch to it, redirect Bluetooth input to your app in phone. \$\endgroup\$ Oct 4, 2017 at 7:59

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