Ledvance Sun@Home Planon Plus + Ledvance Remote Control

Question

Hi there, I would like to free my Ledvance lamps from the cloud. That should work. But I still have a question. I would also like to continue using the Ledvance Remote Control. They have a BK7231N chip in them. You don't pair the remote with the app, but connect it directly to the lamp. That's...

p.kaczmarek2 · Answer

There are required pads available, can you solder to them? Just make sure to make 2MB flash backup first. Are you sure that this remote works in WiFi mode and not as Bluetooth/?

philippeaellig · Answer

Thanks for your answer.Yes, I can solder to them.Good question, I guess it works with Bluetooth because I can't see the remote in my network.

p.kaczmarek2 · Answer

Well, for a start, you can just do 2MB flash read and it will tell us more about this device. Do not flash OBK yet.

philippeaellig · Answer

I tried it. But I was unsuccessful. I have an USB UART CH340G Adapter. I have connected TX to RX and RX to TX. At first I also connected VCC and GND to the BK7231N. Unfortunately it did not work. That's why I tried it with an external power supply.

I selected the UART port and then clicked on "Read only OBK config". Then I switched on the power supply so that the device starts. That did not work. I also tried to connect 0.25 seconds CEN to GND. But that didn't work either. I tried many times with a metronome.

p.kaczmarek2 · Answer

It is always necessary to connect common ground as well. USB to UART convert ground must be connected to PCB, because RX/TX signals are in reference to ground. It will not work if you don't connect a common ground.

philippeaellig · Answer

I tried this too, but the result is the same.

edit:
i checked the Bk7231N and found a problem: TX is labeled as RX and RX is labeled as TX. So, i have to connect TX to TX and RX to RX.

{
	"Jsonver":"1.0.0",
	"blindt":"8",
	"module":"CBU",
	"nightbrig":"5",
	"bristep":"20",
	"hsvstep":"20",
	"keylt":"3",
	"keyglobefunc":"[[9",
	"step_rate":"20",
	"category":"0505",
	"keyccfg2":"10",
	"tempstep":"20",
	"nightcct":"0",
	"keyccfg1":"9",
	"crc":"30",
	"prod_test":"false",
	"fac_pin":"db3angmsimkndxht "
}

philippeaellig · Answer

@p.kaczmarek2 What do I have to do now with the 2MB flash read?

p.kaczmarek2 · Answer

The 2MB flash read is required to get Tuya JSON config. In most of the devices it will contain your GPIO data, but in the case of your device, I can't see any GPIO information there. It seems that you need to find our GPIO roles manually, maybe with GPIO Doctor from our Web App.

philippeaellig · Answer

I have to give up. The TX and RX pads on the remote control have fallen off. I'm not a good solderer.

What I have figured out:

P7 (PWM 1)	S2 (Book)	P15
P6 (PWM 0)	S3 (B)	P15
P26 (PWM 5)	S4 (Palm tree)	P15
P7	S6 (Screen)	P17
P6	S7 (A)	P17
P26	S8 (Moon)	P17
P8	S9 (ON)	P9
P7	S10 (OFF)	P9
P6	S11 (warmer)	P9
P26	S12 (darker)	P9
P8 (PWM 2)	S13 (less saturation)	P28
P7	S14 (brighter)	P28
P6	S15 (more saturation)	P28
P26	S16 (colder)	P28

I guess that the PIN P15, P17, P9 and P28 are listening to the PWM Signals from O8, P26, P7 and P6. And when a button is clicked and the PWM signal arrives, you then know which button is clicked. Unfortunately, I do not yet understand how to input this into OpenBK.

p.kaczmarek2 · Answer

So it's a classic matrix keyboard. Should be easy to support, but would require some programming knowledge.

philippeaellig · Answer

Developing is not the problem, I am a developer. But I don't know how to implement this with ODK.

p.kaczmarek2 · Answer

Have you ever implemented a matrix keyboard scan on any platform?

In OBK, you can either utilize a RTOS timer or use our quicktick timer, which fires every 25ms. And then, repeatedly, set one of the matrix columns to high state, and then sample the rows. Then again, set another column to high state, and sample rows again. Etc, etc. You may need to take in the account the propagation time, but it can be done easily.

I can write a driver stub for you in C, and then we can finish that one together.

Is the device flashed with OBK already? If so, then you don't need RX/TX, you can update via WiFi.

Alternatively, you could send me the board with the broken pads and I think I may be able to restore them and use it for development.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.

philippeaellig · Answer

Yes, it's already flashed with OBK.

p.kaczmarek2 · Answer

Okay, so, do you know C? Would you like to help with the code, or maybe, I can just try to make the driver draft myself and just let you test?

I could prepare a first version today, but it may require several testing attempts and fixes.

Pseudocode would be:


set P9 to high, others low
sample P8
sample P7
sample P6
sample P26
set P28 to high, others low
sample P8
sample P7
sample P6
sample P26
// etc, etc, etc

gelbetomate · Answer

Hi, I recently had the chance to buy 2 of these Ledvance Planon Plus lamps including this remote control.

The first remote I flashed with OBK. I tried it several times to back up with a lot of tricks and tweaks I read in this forum, but didn't succeed. It always stopped and had a time out after a while. So I took one statement I found "not possible with N" and just started to write OBK and this succeeded the first time without any trouble.

But now I have a blank OBK and wanted to apply a as supported listed Template for this remote, but the Template seems to be empty and is referencing to this thread for more information.

Until now I did not find further information and I'm wondering if one went on with his analyses and can share it?

btw I'm willing to do some tests and I still have this device with the original firmware.

p.kaczmarek2 · Answer

Can you show some detailed photos of your device? I'm not yet even sure how this remote can work, is it using BT or some kind of WiFi like ESPnow? @insmod ,any ideas?

gelbetomate · Answer

It's exactly the same one analyzed by @philippeaellig It's using wifi.

p.kaczmarek2 · Answer

So this remote has a pairing process where you enter your SSID and pass? And it connects to your router?

gelbetomate · Answer

well, I did not use the ledvance app for now, but it looks like you first pair your lamp with the mobile app and then you bring your lamp into pairing mode and connect the remote to it. I do not know if this is using WIFI or BT.

https://www.ledvance.com/00_Free_To_Use/asset...1_smart-_wifi_installation_remote_control.pdf

adding this video, as you can see the process and the app
(51) So einfach koppelst du die LEDVANCE SMART+ WiFi Fernbedienung mit einer LEDVANCE SMART+ WiFi Lampe! - YouTube

https://www.youtube.com/watch?v=7Y7D66_HfMw

it is saying wifi remote.

gelbetomate · Answer

I would be simply happy if I can use the remote buttons in my wifi network to trigger an event in HA or MQTT or both. No need to implement any pairing mode or other features provided by a direct connection between remote and lamp which might be using BT.

So, now trying to understand if the matrix keyboard mentioned above has been implemented and how to use it?

Simple Scenario One: trying to use button S2 on the remote using what I understand from the table listed above:

this is simply triggering the "Toggle Light". Slow but proven now, it's leveraging wifi yeah, but it's not only working for S2 also other buttons are triggering the toggle... hmmm

I don't want the "LED Dimmer/Brightness" slider, but this comes from PWM, I guess.

I'm still new to OBK and this type of configuration. Every hint can help ;-)

pirkelt · Answer

Hello all,

formerly i experimented with this remote control, too. It´s important to know the unit includes a (very low) power stepup converter to boost the battery voltage to 3.3V. The converter is always on. So i use this unit with rechargeable batteries. The ADC Port is free, but they designed solderpads on PCB for 0402 Resistors. One to ground (i use 2,2 Megohm Resistor) and the second to VCC from regulator (why ?). I soldered the second Resistor (2,7 Megohm) directly to batteryport to monitor the Batterysupply. In sleep the Unit draws only 30-40 microamps with regulator.
Wakeup is a simple push on a button in the "Keycross" area. The Remote starts, within 6 seconds is the unit ready connected.
The blue WiFI LED is switched on during operation for 90 seconds, goes off for two seconds to warn me for disconnection/sleep down in 10 seconds.

In my configuration i can use 6 buttons (devices). In my application some buttons supports multiclick (like the old WiFi Shelly Button 1).

Here is my autoexec.bat with comments

// PowerSave 2
alias mode_wifi setPinRole 14 WifiLED
alias mode_relay setPinRole 14 AlwaysHigh

// at reboot, set WiFiLEd
mode_wifi
// then, setup handlers
addChangeHandler WiFiState == 4 mode_relay
addChangeHandler WiFiState != 4 mode_wifi

SetChannelLabel 1 "Taste ON"
SetChannelLabel 2 "Taste OFF"
SetChannelLabel 3 "wärmer"
SetChannelLabel 4 "dunkler"
SetChannelLabel 5 "Taste A"
SetChannelLabel 6 "Taste B"
SetChannelLabel 0 "Tastenkreuz triggert Sleeptimer"

Battery_Setup 0000 3250 1.00 3250 2570 // Spannungsteiler 2M4+2M7 @3V
Battery_cycle 29 // Aktualisierung in sek.

addEventHandler OnClick 7 backlog SendGet http://192.168.0.78/white/0?turn=toggle&brightness=50 // P7 Aufruf GU10 TV
addEventHandler OnDblClick 7 backlog SendGet http://192.168.0.78/settings?mode=white
addEventHandler On3Click 7 backlog SendGet http://192.168.0.78/settings?mode=color // P7 Aufruf GU10 TV grün
addEventHandler On4Click 7 backlog SendGet http://192.168.0.78/white/0?turn=on&brightness=100
addEventHandler OnHold 7 backlog SendGet http://192.168.0.78/color/0?effect=1 // P7 Aufruf GU10 TV Animation

addEventHandler OnClick 8 backlog SendGet http://192.168.0.79/white/0?turn=toggle&brightness=50 // P8 Aufruf GU10 Sofa
addEventHandler OnDblClick 8 backlog SendGet http://192.168.0.79/settings?mode=white
addEventHandler On3Click 8 backlog SendGet http://192.168.0.79/settings?mode=color // P8 Aufruf GU10 Sofa grün
addEventHandler On4Click 8 backlog SendGet http://192.168.0.79/white/0?turn=on&brightness=100
addEventHandler OnHold 8 backlog SendGet http://192.168.0.79/color/0?effect=1 // P8 Aufruf GU10 Sofa Animation

addEventHandler OnClick 6 backlog SendGet http://192.168.0.88/cm?cmnd=Power%20Toggle // P6 Aufruf Pixel LED
addEventHandler OnDblClick 6 backlog SendGet http://192.168.0.88/cm?cmnd=Color%207c2a00 // P6 Aufruf Pixel LED warm
addEventHandler On3Click 6 backlog SendGet http://192.168.0.88/cm?cmnd=Color%2000FF00 // P6 Aufruf Pixel LED grün
addEventHandler On4Click 6 backlog SendGet http://192.168.0.88/cm?cmnd=Color%2050c950 // P6 Aufruf Pixel LED kalt
addEventHandler OnHold 6 backlog SendGet http://192.168.0.88/cm?cmnd=Anim%200 // P6 Aufruf Pixel LED Animation

addEventHandler OnClick 26 backlog SendGet http://192.168.0.49/rpc/Switch.Toggle?id=0 // P26 Philips Scene LED

addEventHandler OnClick 17 backlog SendGet http://192.168.0.47/rpc/Switch.Toggle?id=0 // P17 Funktisch schalten
addEventHandler OnClick 15 backlog SendGet http://192.168.0.47/rpc/Switch.Toggle?id=1 // P15 LED (A2) schalten
addEventHandler OnHold 15 backlog SendGet http://192.168.0.98/cm?cmnd=Power%20Toggle // P15 Aufruf Couch E27

// give user time to play
delay_s 90
setPinRole 14 AlwaysLow
delay_s 2
mode_relay
delay_s 10
// sleep either until pin wakeup
PinDeepSleep

and my pin configuration:

"pins":
"6": "Btn;3",
"7": "Btn;2",
"8": "Btn;1",
"9": "AlwaysLow;0",
"14": "WifiLED;0",
"15": "dInput_n;0",
"16": "dInput_n;0",
"17": "dInput_n;0",
"23": "BAT_ADC;0",
"26": "Btn;4",
"28": "DoorSnsrWSleep_nPup;0"

Thank you very much for this great Project!

Thomas

p.kaczmarek2 · Answer

Good job, make sure to include the new Quick connect to WiFi flag/mechanism by @insmod Well, isn't ADC port used (or supposed to be used) for battery voltage check? I've read reports that having too low voltage corrupts BK7231 flash and then you have to flash whole 2MB image again to recover it.

pirkelt · Answer

-> Good job, make sure to include the new Quick connect to WiFi flag/mechanism by @insmodThanks!I tried this new Quick reconnect feature, but the unit starts two times and the reconnecting is much slower. It needs sometimes up to 30 seconds! Back to 18.76 everything is ok again. I use always a static IP configuration. confused...-> Well, isn't ADC port used (or supposed to be used) for battery voltage check? I've read reports that having too low voltage corrupts BK7231 flash and then you have to flash-> whole 2MB image again to recover it.The ADC is normally not connected (R7 & R8), and from the origin PCB design only measurement to regulated 3,3V power supply is possible. The step-up voltage converter includes an undervoltage detection to switch off in emergency (empty or removed battery). A big 470 microfarad buffer capacitor on battery side is equipped, too. Greetings Thomas

insmod · Answer

>>21525678
You don't need to flash back, just disabling flag 51 would do.
You also need to wait at least ten seconds while connected to fast connect data to be saved. If not - then it connects normally.
It's a random thing, on some of my devices it doesn't work properly too.
I remember that my T device only connected on the second try, but after i rebooted my router (AX3600 OpenWrt 24.10), it started connecting on the first try.

I also recommend to quickly reset 3 times with flag 51 enabled to erase fast connect data - to ensure that it didn't try to use some garbage data.

pirkelt · Answer

Thanks a lot for your very fast reply! I will try it again and will report later! Cheers Thomas

pirkelt · Answer

Hello all, Hello @insmod,back from my family I tried your recommendations and tested again. Disabling flag 51 decreases the connection time to 4-6 seconds. Similar to 18.76 FW. My Router is a AVM FB 7590. It looks like the Unit starts two times with two instances. Both count down timers are visible in Web UI. Old 18.76 FW shows only one and for my opinion is correct. This behaviour is repeatable. Can this be explained? here is my log from beginning with one switching event:N:Time 13, idle 191192/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 14, idle 190262/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 15, idle 176496/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 16, idle 192364/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 17, idle 189727/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 18, idle 189450/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 19, idle 191961/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 20, idle 189475/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:GEN:dhcp=0 ip=192.168.0.80 gate=192.168.0.8 mask=255.255.255.0 mac=4c:a9:19:4c:23:ebInfo:GEN:sta: 1, softap: 0, b/g/nInfo:GEN:sta:rssi=-49,ssid=xxxxxxxxx ,bssid= xx:xx:xx:xx:,channel=6,cipher_type:CCMPInfo:MAIN:Time 21, idle 184448/s, free 67368, MQTT 0(1), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MQTT:mqtt_host empty, not starting mqttInfo:MAIN:Time 22, idle 192064/s, free 67368, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 23, idle 188849/s, free 55672, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 3/38 Info:MAIN:Time 24, idle 188127/s, free 67368, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:GEN:15 Button_OnInitialPressDownInfo:GEN:15 key_short_pressInfo:EVENT:EventHandlers_FireEvent: executing command backlog SendGet // P15 LED (A2) schaltenInfo:CMD: CMD_SendGET received with args // P15 LED (A2) schaltenInfo:HTTP_CLIENT:HTTPClient_Async_SendGet for sizeof(httprequest_t) == 160!Info:MQTT:Channel has changed! Publishing 1 to channel 6 Info:HTTP_CLIENT:Parse url '192.168.0.47', port: 80Info:HTTP_CLIENT:HAL_TCP_Establish: created socket 2Error:HTTP_CLIENT:success to establish tcp, fd=2Info:HTTP_CLIENT:httpclient_recv 131 bytes has been readInfo:CMD:LFS_ReadFile: failed to file //Info:MAIN:Time 25, idle 178350/s, free 67368, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38 Info:MAIN:Time 26, idle 188174/s, free 67368, MQTT 0(2), bWifi 1, secondsWithNoPing -1, socks 2/38 Thanks for your attention,Thomas

gelbetomate · Answer

Hi,

I thought it's because of me still struggling with the setup, but now it looks like it's not only at my place. I can confirm with the same router type it looks the same here:

Also the logs have those entries.

It connects, the wifi light flashes, then it stays connected, until the 2nd sleep timer went down to 0, then the light flashes (connects) again and after the next deep sleep timer went down the light turns off completely and the connection is lost. Only turning power off and on brings it back to life. I didn't solder anything with the voltage regulator or any shunt etc. and I'm still powering my remote with 3.3V from the USB TTL converter.

Cheers

Approach	What users observed	Best use
Read 2MB flash first	Safest path for extracting Tuya JSON before changes	Device identification and recovery planning
Flash OBK directly	One 2025 user succeeded immediately, but got a blank setup	Fastest path when backup fails
Use simple pin roles only	Several buttons can collapse into one action	Quick testing, not full matrix support
Use matrix-aware or reduced-button mapping	Stable practical control was achieved with 6 usable buttons	Home Assistant, HTTP, or MQTT triggers

Ledvance Sun@Home Planon Plus + Ledvance Remote Control

Can I flash a Ledvance remote control with OpenBeken without soldering to the BK7231N pads?

Topic summary

FAQ

Quick Facts

How can I flash a Ledvance Smart+ WiFi Remote Control with a BK7231N chip to OpenBeken using the exposed 3.3V, GND, RX, TX, CEN and CSN pads?

What is a 2MB flash backup on a BK7231N device, and why should I read it before flashing OpenBeken?

Why does the Ledvance Sun@Home Planon Plus remote not show up on my router, and how can I tell whether it communicates over WiFi, Bluetooth, or something else?

What is Tuya JSON config on BK7231N devices, and how does it help identify GPIO roles when porting a device to OpenBeken?

How should RX and TX be wired on a BK7231N module when the board silkscreen appears to label TX as RX and RX as TX?

What steps are needed to enter UART flashing mode on a BK7231N remote using CEN, a CH340G USB-UART adapter, and BK7231GUIFlashTool?

Why is a common ground required between a USB-UART adapter and a BK7231N board during reading or flashing?

How do I map the Ledvance remote's button matrix in OpenBeken when the keys are arranged across pins like P6, P7, P8, P26, P9, P15, P17 and P28?

What is a matrix keyboard scan in OpenBeken, and how would I implement it with quicktick or an RTOS timer for this Ledvance remote?

How can I use a flashed Ledvance remote with OpenBeken to send MQTT or Home Assistant events instead of pairing directly with the lamp?

OpenBeken button roles vs PWM roles on this Ledvance remote: which pin configuration works best for getting reliable button events without unwanted dimmer behavior?

Why do multiple buttons on the Ledvance remote trigger the same action when I configure a single pin in OpenBeken?

How can I add battery voltage monitoring to this Ledvance BK7231N remote using the free ADC pin and resistor divider pads on the PCB?

What is the OpenBeken quick connect to WiFi flag 51 feature, and why can it make this remote connect slowly or appear to start twice?

How do I configure deep sleep, wake on key press, WiFi LED behavior, and multi-click actions on the Ledvance remote using OpenBeken autoexec.bat commands?