MCU

The BK1085 is a PLL FM transmitter with 64-125 MHz band, in this example i use an Arduino NANO
and my new BK1085-DEV board.

Even thoug has been used the Nano board, the sourcecode has been compiled with Eclipse and AVR GCC, not Arduino official

IDE and the code is pure C, for the upload i use a USBASP programmer, that wipes out the Arduino bootloader.

The example code simply switches between some stations and pushes a PWM signal inside the R and L inputs
to send noise for a little time on each station, you could connect an audio source.

The project started with a FM car modulator for MP3 music, then i decided to build my development board, you
can see the "history" of my work in the pictures below.

Arduino connections:

D2 MOSI
D3 SCK
D9 L-CH/R-CH NOISE (+ 470ohm to gnd)
5V 3V3 (power all the system with 3v3)
GND GND

Download gerber

Download sourcecode

Download BK1085 datasheet

The MCU has been removed, it provided the clock source so i used a crystal and 2 capacitors for the oscillator.

395

Then i designed my small DEV board....

bk1085 scheme

 

473

 

472

 

bk1085 00

 

bk1085 01

 

 

 

MCU

ANALOG

MODS

RASPBERRYPI

SLACKWARE LINUX

Bad resolution,but is a starting point, the central trimmer should have been the speed, but with this PWM settings is not easy to deploy.

Sourcecode here

GERBER here

PDF scheme here

servo

 

servo 02

 

 

Another small dev board for your breadboard for Tiny13, 25, 45, 85 etc..for SO8 packages.

The video with the example code uses two source codes according to the video, the first uses a timer + interrupt, the second uses timer + ADC.

Sourcecode here

GERBER here

board

 

scheme

 

tinyDev00

 

tinyDev01

 

tinyDev02 

Same as the Arduino one here, but this is cheaper. PAY ATTENTION, put 10K resistors between the BT5/BT6 out and the actual buttons or it freeze

the USB stuck, i don't know why but it seems to be a current sink problem, maybe because all the PULL-UPs enabled, but the strange thing

is that these inputs only have the problem. 

Sourcecode here

GERBER here

PDF scheme here

20160423 170810

 

layout