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The transmitter circuit uses Microchip's dsPIC33FJ16GS504 for the analog-to-digital conversion of the input signals on two channels. The processed data on the dsPIC are then transmitted to the phone (for waveform display) via the LMX9838 bluetooth SPP module.
specs/ranges:
time per division: {5us, 10us, 20us, 50us, 100us, 200us, 500us, 1ms, 2ms, 5ms, 10ms, 20ms, 50ms }
volt per division: {10mV, 20mV, 50mV, 100mV, 200mV, 500mV, 1V, 2V, GND}
analog input (depends on external pre-amplifier configuration): {-8V to +8V }
The source codes for the bluetooth communication is based on Bluetooth Chat example from http://developer.android.com. That example contains three java source files. And, I've completely copied the "DeviceListActivity.java", which is used for searching remote bluetooth devices. Then I've modified the "BluetoothChatService.java" to use only the RFCOMM Client functions, and used the well-known UUID "00001101-0000-1000-8000-00805F9B34FB" for the Bluetooth RFCOMM/SPP.
For the plotting of waveforms, I'm using SurfaceView object to draw on its canvas. This tutorial found on www.helloandroid.com helps me a lot for this task: "How to use canvas in your android".
The rest of the job mainly involves porting of my previous Python S60 script to JAVA language. It was too painful on my side, because I had to convert a single script file to multiple java + xml source files! Nonetheless, it was a good experience for me on learning the Android SDK (JAVA programming).
Project source codes for Android and dsPIC (with APK and HEX) :
Here's now my circuit. Nothing special on it, all are based on existing circuits.
*The dsPIC I have used is most probably NOT the best choice for this project because of the many left unused peripherals (extra pins). But, this is the only part readily available in my bin and it has the fastest ADC (2 x 2MSps) among the chips I have.
*If you prefer to change the input range via the op-amp preamp, the computation is located on the "adc.xmcd" file.
*You can use other SPP bluetooth modules aside from LMX. (accdg to manufacturer, it's already obsolete)
The TDA1566 is a car audio power amplifier with a complementary output stage realized in BCDMOS. The TDA1566 has two Bridge Tied Load (BTL) output stages.
The TDA1566 can be configured in a single BTL mode and drive a 1 Ω load. For the single BTL mode it is necessary to connect on the Printed-Circuit Board (PCB) the outputs of both BTL channels in parallel.
The TDA1566 is a car audio power amplifier, whose schemematic is shown below, built on a model schemematic include chips TDA1566. The TDA1566 is a car audio power amplifier does not require the establishment and therefore suitable for repetition, even beginners.
In a unipolar power load (speaker system) includes a bridge circuit which does not require the separation of electrolytic capacitors of high capacity.
Schematic TDA1566 Car audio power amplifier
At a load resistance of 4 ohms and power voltage 14,4 Volt chip developed 2X23 Watt's, and at a load of 2 ohms - 2x40 Watt's. Tues Rejection Ratio ripple voltage 70 dB, frequency response at the level of -1 dB 20 Hz ... 20 kHz, the gain 26 dB, the level of intrinsic noise of -100 dBA.
The developed diagnostic system provides protection against overcurrent and overheating with indicator LED CLIP restrictions and protection operation LED DIAG. Mute and standby modes are included, respectively,
intermediate (from 2,5 to 4,5 V) and zero levels at the control input EN and connector STBY.
