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kimmoli's Avatar
Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#1
This is thread for FM Receiver/Transmitter TOH (about 87.5 .. 108 MHz)

FAQ:
Q: Are you going to make this TOH for sale also or just to make a tutorial?
A: No decision made yet.
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TOH ideas, concepts and creations since 2013 toholed tohuart toheink Heebo tohIRi i2ctool tohmm LeTOH FMTOH

Last edited by kimmoli; 2014-08-21 at 06:17.
 

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kimmoli's Avatar
Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#2
Those who follow me on twitter may have seen this short video;

https://www.youtube.com/watch?v=xTO2Q3jX8Z8

It is simply RRD-102 V2.0 board attached to MyHalf breakout board. The board contains RDA5807M chip and 32.768kHz crystal and passives for bypass and antenna.



MyHalf bare PCB's available through OSHPark https://oshpark.com/shared_projects/6TWMNB35

RRD-102 Boards are available from ebay, aliexpress e.g.
http://www.aliexpress.com/item/Free-...988842002.html

Datasheet can be found here http://www.seeedstudio.com/wiki/imag...sheet_v1.1.pdf

Topview of breakout board


Simply connect the SDA(=DATA) and SCL(=CLOCK) to I2C bus which is converted to 3.3V levels.
3.5mm audiojack to L/R out and GND
3.3V from phone to VDD
Antenna (piece of wire) goes to FM pin
Leave N.C. and RCK pins not connected.

For reference 3.5mm plug contacts:


Sourcecode in my github https://github.com/kimmoli/fmreceiver

This contains minimalist UI with tuning and RDS station name and radio-text display:


For the transmitter side, i did order some KT0803L chips - currently waiting them to arrive:


datasheet http://radio-z.ucoz.lv/kt_0803/KT0803L_V1.3.pdf

To get the audio from FM receiver (and to FM transmitter) to jolla audio-system is under planning. More about that when it is time for that.
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TOH ideas, concepts and creations since 2013 toholed tohuart toheink Heebo tohIRi i2ctool tohmm LeTOH FMTOH

Last edited by kimmoli; 2014-08-15 at 18:59.
 

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#3
Subscribed to this thread. Nice idea, be successful. ;-)
 

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#4
I'm interested too! Thank you for your effort
 

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#5
Nice, Kimmoli!
 

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#6
It's a pity that you don't do things for (far superior) N900. You got clever ideas
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#7
Great!! Good work!! I'm very interesting on this TOH.
 

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#8
I'm in.

(And about what Estel said, I do hope you'll do things for the Neo900! N900 is indeed the King, but it's becoming a bit slowish for nowaday's standards. )
 

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#9
I'd like to see a bunch of these TOH's merged into one uber "kitchen-sink/swiss-army-knife" TOH ;-P
No easy task; I imagine it'd take many iterations of miniaturisation, plus the I2C BUS may start to get saturated.
 

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Posts: 559 | Thanked: 2,701 times | Joined on Dec 2013 @ Espoo, Finland
#10
Originally Posted by Estel View Post
It's a pity that you don't do things for (far superior) N900. You got clever ideas
It might be due that fact i have had no pleasure to own a N900.

Originally Posted by jalyst View Post
... "kitchen-sink/swiss-army-knife" TOH ...
Yep. Getting started with one feature/TOH, maybe next will already combine few things.
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