|6th January 2014, 06:16 PM||#11|
Join Date: May 2010
Update 2014: remote pinouts
I have one of these boards on my desk and I took the time to study the connections to the remote control connector.
2. Headphones 1
4. Headphones 2
6. +5V power to remote
10. not connected (I think so)
11. STBY command from remote to system
12. MUTE command from remote to system
13. Spatial stereo command from remote to system
14. I2C SCL from remote to system (NJW1150)
15. I2C SDA from remote to system (NJW1150)
Pins 1,3,5 are analog ground. The other grounds are digital.
I don't know which Headphones signals is left and which is right.
Pins 11 and 12 go to the bases of two NPN transistors, so series limiting resistors are mandatory (10k should be fine). The bases of these two transistors are tied to +5Vcc on the system board through 20k resistors.
Tie pin 11 to GND to get the TDA power IC's out of standby. Leave open or to +5V for stand-by. The thermal sensor (normally closed connection) is connected between pin 11 and the base of the standby transistor. When overheat, it opens and the power ICs go to standby.
Tie pin 12 to GND to get the power ICs out of MUTE mode. Leave open or tie to +5V for MUTE On.
Tie pin 13 to GND to get the same effect as setting the swith on the back of the board to the "2ch" mode. In this mode, the rear channels are obtained from processing the two front channels (a sort of spatial stereo, they filter FR and FL then get the R-L and L-R signals which become the rear signals).
Pins 14 and 15 go straight to the system's volume and tone controller, NJW1150.
Its datasheet can be found on the internet, and I believe it's piece of cake to control with an Arduino.
I'm working on a small controller based on a PIC mcu (18F2550) because that's what I've got laying around.
Edit: I've just realized that the series 10K resistors are not needed because of the on-board pull-up 20k resistors. It would be best to use open-collector outputs to attack pins 11 and 12. Perhaps 13 too. Or better, use latching switches to GND.
Last edited by ceteras; 6th January 2014 at 06:20 PM.
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