What I am trying to achieve is to connect a 1950s Western Electric rotary phone handset that has two wires leading from it and connect these to the XS838 Hiletgo Bluetooth module, which should support Hands free protocol and full duplex communication.
I have identified the (mic)+ and (mic)- contacts on the chip. Once these wires are connected to the contacts and the module is connected to an Arduino Uno and the cell phone paired with the module, would that be all that is required to transfer the audio to the rotary handset from an incoming bluetooth call?
I should add that the arduino is only there to convert the rotary dials into pulses to make calls from the rotary through the bluetooth module.
I hope I have made my question clear, thank you for looking.
Thatguyatbreakfast:
What I am trying to achieve is to connect a 1950s Western Electric rotary phone handset that has two wires leading from it and connect these to the XS838 Hiletgo Bluetooth module, which should support Hands free protocol and full duplex communication.
I have identified the (mic)+ and (mic)- contacts on the chip. Once these wires are connected to the contacts and the module is connected to an Arduino Uno and the cell phone paired with the module, would that be all that is required to transfer the audio to the rotary handset from an incoming bluetooth call?
I should add that the arduino is only there to convert the rotary dials into pulses to make calls from the rotary through the bluetooth module.
I hope I have made my question clear, thank you for looking.
Does your bluetooth module support carbon microphones? Does your Bluetooth module support magnetic ear pieces?
Paul
Hi Paul, thanks for the reply. I looked around and couldn't find out if the module actually supports carbon mics or magnetic earpieces.
Do you have any idea as to where or how I'd determine compatibility?
Thanks again.
Normally I would say look in the data sheet but when I tried to look for it it said
Your search - XS838 Hiletgo Bluetooth - did not match any documents.
It won’t actually say carbon mike, these change their resistance with the sound where as most mikes actually generate a voltage. Therefore you might have to have a seriese resistor from the microphone to the 5V line of the same resistance value as you measure the mike to be. Then use a capacitor to couple this into the input.
As to the output, magnetic diaphragm actuators have a high impedance so you might get away with that but I don’t know if the volume will be enough. I would also AC couple the output to the headphone.