More free I/O on ALL Androids ;-)

[rayellam]

1. Two channel A/O = send a tone out from the L or R or both channels on the headphone jack.....us a freq to voltage converter at the remote end............. UNTESTED.

2. A/I = use the mic input on the headphone jack, send in a tone from the remote end and do some frequency analysis to convert to a linear level.............UNTESTED

3. D/I = Use the plugged function to provide a free digital input (see my previous post)..........TESTED

All this came about because im using Android 2.3.6 and cannot easily design the remote electronics to be a host mode USB...........wish i chosen a platform with Android 3+ because that would have been easy, a days work BUT iv already bitten the bullet and now have 200+ 2.3.6 devices :-/ .........................maybe i should have researched better.

As my old man used to say "there is always more than one way to crack an egg"

Cheers
Ray

 

[alexhi]

Hi Ray!
I did control the microcontroller atmega48PA via the audio output. Used 8870 chip.
Tablet did tone DTMF.

 

[rayellam]

Hi Ray!
I did control the microcontroller atmega48PA via the audio output. Used 8870 chip.
Tablet did tone DTMF.

Th A/O and A/I are just a conceptual idea and are NOT tested........but in theory they should work?

If/when i ever test this then i will use a low cost $1-2 PIC micro, start a timer and measure the period of the cycle then deduce a frequency. Amplify the input sine wave to clip and be a square wave then use that as an interrupt to start/stop the timer. Using this method i can count MHz with an accuracy of around better than 0.01% (tested)

Try it and report back?

Ray

 

[rayellam]

BUT....sounds like you already tried it

is it possible to upgrade Android version from 2.3.6 to 3.1 and then i will have the ability of using the Android as a USB master? mmmmmmmmmmmmm.......many questions

 

[alexhi]

DTMF signal does not react to the music. How are you going to do signal analysis?

 

[alexhi]

Here is my program terminal for testing microcontrollers via Android (USB OTG)
https://play.google.com/store/apps/details?id=ru.shipov.termusb&hl=ru

 

[rayellam]

DTMF signal does not react to the music. How are you going to do signal analysis?

I was talking just frequency analysis to derive a precise voltage at the remote end for say motor control via PWM but an interesting thought on the music input front? bet u could turn a few heads with the concept of that

 

[rayellam]

F

I was talking just frequency analysis to derive a precise voltage at the remote end for say motor control via PWM but an interesting thought on the music input front? bet u could turn a few heads with the concept of that

Full lighting desk control in ya pocket????????

 

[rayellam]

Alexhi,
I took a look at you app, What Android O/S are you using?

 

[alexhi]

I would have done so ..... Tablet->DTMF COMMAND->CHIP MT8870 ->PIC or AVR or STM32F0 controller -> PWM

 

[alexhi]

Alexhi,
I took a look at you app, What Android O/S are you using?

ANDROID 4.0

 

[rayellam]

I would have done so ..... Tablet->DTMF COMMAND->CHIP MT8870 ->PIC or AVR or STM32F0 controller -> PWM

Im talking about the phone end. is your phone acting as a USB master?

 

[alexhi]

Im talking about the phone end. is your phone acting as a USB master?

Yes. My phone USB Master. Microcontroller SLAVE.

 

[alexhi]

Here is my example of voice control microcontroller atmega48 and Tablet (AUDIO OUTPUT)
( Russian )
Sorry my English