Here comes the setup guide. I have to thank Vincent77 for getting this project started.
Bulding a 6 channel volume control based on the VxD boards:
- Build 3 VxD boards. One board will act as the master, two boards will act as slaves. Only one LCD display, one rotary encoder and one IR receiver is needed.
You can use a common (bigger) power supply for all channels.
- Solder a wire to the tx pin of the master board (blue wire on photo).
- Solder a wire to the rx pin of each slave board (yellow wire on photo).
- Upload the master software (firmware_LDR_v1_multi3) to the arduino of the master board.
- Connect power supply display, rotary encoder and power supply to the board.
- Run setup and calibration process on the master board.
- Turn the rotary encoder while watching the tx led on the arduino. The led should be flashing as long as you turn the rotary encoder.
- Upload the slave software (firmware_LDR_v1_slave3) to the arduino of the first slave board.
- Connect power supply display, rotary encoder and power supply to the board.
- Run setup and calibration process on the slave board.
- Repeat the procedure for the second slave board.
- Connect power supply to all boards, connect blue wire of the master board to yellow wires of the slave boards. Connect display and rotary encoder to master bord.
- Power up all boards. Turn the rotary encoder while watching the tx led on the master arduino and the rx leds on the slave arduinos. The rx leds should show the same flash sequence as the tx led but slightly delayed.
- Connect the volume control to your audio system.
Drawback of the current implementation:
- Code of master and slaves are based on the initial sketch provided by Vincent77 including some modifications regarding the handling of the rotary encoder. There is no
support for OLED displays
- There is no individual volume adjustment of single channels. All channels will show up the same attenuation.
- The code for serial communication needs additional memory. Using more then 40 volume steps might cause problems, as the arduinos might be running out of memory.
bodo
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Hi bodo,
Thank you for sharing your work.
I just received the elements to build a 2 ways preamp.
nounouchet
Thank you for sharing your work.
I just received the elements to build a 2 ways preamp.
nounouchet
Hi, I'm building this preamp, I passed everything and all working now except the IR Remote. It seem not working. To be clear, I didnt have the Apple Remote and only use my phone (LG V10) app to test the IR.
Could anyone help me how to troubleshot the IR?
Could anyone help me how to troubleshot the IR?
I still not try to use this one on my system but I did use another simple LDR volume control on one of my amp. It is very transparent and I highly recommend it. That why I decided to build another advance once.
I'm ordering the apple remote. So I have to wait ... I play with IR code but not success yet due to my lacking in adruino code.
I think from memory the air remote app works. I will check for you tonight.
https://play.google.com/store/apps/details?id=com.splashythings.macremote&hl=en
Thankf! It is the same with me when I tried. I modified the code to show ir code on screen but it is completly different than Apple Remote code. I ended up add the IR Code for the Sony remote and use it until I got the Apple Remote.
I still have few all-in-one pcbs with relays available, if someone needs them.
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