Make Teufel smart home capable with MQTT

The Teufel e450 digital is a nice HomeCinema system, but it lacks some features like auto-on or automatic input selection. Lets change this.

Description

I want my Teufel e450 to automatically turn on when Echo dot starts playing music. With its capacitive touch buttons and glue sealed housing, there is no simple way to hack it direcly into the device. But luckily it comes with a remote control at least able to power on/off, select next audio source and volume control.

The Teufel Puck-Control uses a NRF51822. I first have tried to figure out the wireless protocol, but without success. So I ended up cloning the firmware (luckily there is no read out protection enabled) onto a cheap NRF51822 board and hooked it up to an ESP32, which then is controlling the "buttons" by setting the input levels. The rotary encoder is emulated by a simple state machine.

For audio level detection I use a coupling capacitor connected between the line-out and the ADC and used a high pass filter feeding a low-pass-filter which then triggers the turn-on-command when hitting a threshold value.

Pinout is included in the arduino source.

Quick & dirty hardware. small pitch of NRF518022 module requires magnet wire

Files

teufel.hex

NRF51822 firmware file

hex - 64.64 kB - 04/10/2022 at 16:15

Download

teufel.ino

ESP32 code

ino - 6.48 kB - 04/04/2022 at 11:20

Download

Components

1 × ESP32 I used a Pico D4 dev module

1 × NRF51822

1 × Photoresistor cheap china one

1 × 3nF ceramic capacitor other values work as well

1 × Wires & RCA/3,5mm audio jack, USB cable, Power supply...

Discussions

walter wrote 09/12/2024 at 09:42

Thank you for this great project, it's running now at least. I had some problems with finding the right way flashing to NRF51822, but now its runnig using esp32 and node-red. Thank you very much. waltino

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florianpfaelzner wrote 09/03/2024 at 12:36

Hey guys, I would like to make my e450 smart too, but I am a beginner in stuff like that. I don't understand where to connect the cables! Has somebody a picture or a graphic from this project?

And what cable is meant by "RCA/3,5mm audio jack"?

Thanks and greetings

Flo

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Flo wrote 04/11/2023 at 10:15

See comments in Arduino Code:

// Teufel remote functions

// P0.0 Source switch
// P0.04 Power/Mute/Encoder C
// P0.01 Encoder A
// P0.03 Encoder B
// P0.09 LED2
// P0.29 LED1
// P0.13 RX - (unused)
// P0.14 TX - (unused)
// All inputs are pulled up, so active LOW

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David wrote 04/11/2023 at 10:07

I just saw, the documentation of the pins is in the teufel.ino file.

Edit: Just finished to replicate the project. Works like a charm! I did'nt use the photoresistor to get the real current power state of the Teufel AVR, because the transmission of the commands is pretty reliable and there are separate commands for on and off. So now I finally again only have one (harmony) remote to control all of my devices.
BTW: Instead of an ESP32, I used an Arduino Nano with an Ethernet Shield and had to add the pairing function (>15s input-keypress) to make it work.
So last but not least, I want to thank you for your efforts! I also tried to analyse the protocol and therefore already had a 2G4M04S1D-Dev-Board laying around, but would never have had the idea to simply clone the binary from one NRF51822 to the other one. You saved me a ton of time! Thanks.

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Bullo wrote 01/07/2023 at 08:17

Hello, a very successful project that I would like to replicate. Could you document which pins of the NRF51822 you used? Thank you very much, Bulli223

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Make Teufel smart home capable with MQTT

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Files

teufel.hex

teufel.ino

Components

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