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@ -1,47 +1,90 @@ |
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# Flahsing Bedlight |
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# Flashing the Yeelight Bedside Lamp 2 |
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## Tools needed |
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* imbus or torx screw driver (3mm?) |
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* Allen key (2mm, 5/64") or torx (T8) screw driver |
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* Soldering Iron |
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* pehabs some Sticky tape |
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* a serial to USB adapter with 3,3 Volt output |
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* Perhaps some sticky tape |
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* A serial to USB adapter (FTDI) |
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* Some wires |
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## Warning |
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We have writen this instructions with care, but we will gave absoultly no warnenty. Perhabs you will destroy your device and your computer. |
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We have writen these instructions with care, but we will give absolutely no |
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warranty. Perhaps you will destroy your device and your computer. |
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## Opening the Yeelight |
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Remove the rubber pads from the botton of the device. |
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## Opening the yeelight |
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Unbolt the 4 screws which were hidden by the rubber pads. |
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Remove the rubber on the botton of the bottom of the light. |
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Unbolt the 4 Screws which was hidden by the rubber. |
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Remove the bottom from the device, exposing the PCB. |
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This might take a bit of force. Just pull it up bit by bit until it pops loose. |
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Remove the plastic. |
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For some good picture of disassembling this device, take a look |
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[at this blog post](https://mysku.ru/blog/china-stores/78455.html) |
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It is in Russian, but the translation by Google works well and moreover, the |
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pictures are the most important thing here. If you scroll down, you will |
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find them easily. |
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## Solder the wires |
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Solder the wires to the points of this picture. |
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Many of the serial to USB adapter have some header pins to which you can |
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connect the wires of a device. Therefore, I find it most useful to take some |
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dupont wires with a female end to them, and cut off the other end. Strip the |
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wire on the other and, and then it can be used to solder it to the board. |
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Solder the wires to the RX, TX and GND debug pads that are shown in this |
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photo. It is not required to solder a wire to the 3.3V debug pad. This pad |
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is not directly connected to the 3.3V Vin of the ESP32 chip, making it a |
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less than optimal candidate for powering the board during flashing. Instead, |
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powering the lamp using its own power supply works best. |
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You can use stick tape to fix the cables before soldering. |
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You can use some sticky tape to fixate the cables before soldering. |
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## Connect to your flashing device |
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Make sure that your that your flashing device is given 3.3 Volt between GND and VCC. If not you can use the regular power adapter instead. |
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## Connect the wires to your serial to USB device |
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The wires must be connected as follows: |
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| Soldering point| Serial USB Adapter name | |
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| -------------- |:------------------------:| |
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| Gnd | Gnd | |
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| GND | GND | |
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| TX | RX | |
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| RX | TX | |
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| GPIO0 | Gnd | |
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| 3.3 V | VCC or regular power adapter| |
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| GPIO0 | GND | |
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To be able to flash the device, GPIO0 must be connected to ground while the |
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device is booted. Therefore, connect these wires before plugging in the |
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device's power adapter. Flashing will not work if you connect these wires |
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when the device has already been powered up. |
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## When you only have one GND pin on your USB Adapter |
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Connect all wires execpt VCC or Power Adapter, then plugin the power in the last step. |
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If your USB Adapter does not have multiple GND pins, then you'll have |
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to find another way to attach GPIO0 to ground. Some options: |
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- Use a breadbord, so you can connect the USB Adapter GND pin to a row on |
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the bread bord, and connect the GND and GPIO0 wires of the board to that |
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same row. |
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- Solder a button on the board that connects GPIO0 to GND when pressed. Then |
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you can hold down this button while plugging in the device's power supply. |
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After booting up, you can release the button (the serial console will also |
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mention that the device is now in flash mode). This is not the most |
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practical solution for most people (since only one such flash operation is |
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needed, from then on OTA - Over The Air - updates are possible), but it |
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was a great help to me during the initial reverse engineering and firmware |
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development. |
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- Manually hold a wire connected to both a GND surface (e.g. the silver pad |
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on the left of the board) and the GPIO0 debug pad, while plugging in the |
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power supply. After booting, the wire can be removed. This is very fiddly |
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way of doing it, but I did it a few times and it can be done. |
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## Download and install esptool |
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@ -50,41 +93,59 @@ See: https://github.com/espressif/esptool/blob/master/README.md#installation--de |
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## Make a backup of the current firmware |
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``` |
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python esptool.py -p /dev/ttyUSB0 read_flash 0x 0x400000 original-yeelight-firmware.bin |
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python esptool.py -p /dev/ttyUSB0 read_flash 0x0 0x400000 original-yeelight-firmware.bin |
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``` |
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/dev/ttyUSB0 is the port of the usb adaper on linux you will see it with `dmesg`. On Windows this is often `COM1`, `COM2` or `COM3` |
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/dev/ttyUSB0 is the port of the usb adaper on Linux. You can find what port |
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is used by the adapter by running `dmesg` after plugging in the USB device. |
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On Windows this is often `COM1`, `COM2` or `COM3`. |
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Caution: You will find WLAN SSID and Password of the lasted used Wifi in this file |
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**Caution**: You will find the WLAN SSID and Password of the latest used WiFi in |
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this file. |
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**After each step with esptool, you have to unplug you power line and connect it again.** |
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## Flash new firmware |
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Setup a ESPHome Project, see [README.md](../README.md) |
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Setup an ESPHome Project, see [README.md](../README.md) |
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Now you can flash the device directly with esphome or by esptool. |
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You can flash the device using esphome or esptool. |
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I normally use the [esphome-flasher](https://github.com/esphome/esphome-flasher) |
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tool, which is an easy to use utility app for flashing ESPHome devices. |
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If you want to flash with esptool, compile with esphome and download it. |
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If you want to flash with esptool, compile with esphome and download the |
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generated firmware. |
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``` |
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python.exe .\esptool.py --chip esp32 --port COM3 --baud 115200 write_flash 0x1000 <yourfile.bin> |
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``` |
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One your firmware is flashed, you can flash more OTA via ESPHOME. |
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## Troubleshooting flash |
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Once your firmware has been flashed, unplug the power and the serial USB Adapter. |
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Then plug the power back in to boot the device using its new firmware. |
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From here on, it is possible to flash the device OTA via ESPHOME. Tuck |
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away those soldered wires in the bottom and add the bottom cover back on. |
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If you have **A fatal error occurred: MD5 of file does not match data in flash!** |
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you can try to use the regular power adapter instead of the vcc line. |
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## Troubleshooting flash |
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If you have **A fatal error occurred: MD5 of file does not match data in |
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flash!**, then make sure you are powering the board using the device's own |
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power adapter. We've seen these errors when trying to power the board using |
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the 3.3V debug pad. |
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After this error, user @tabacha successfully flashed esp with tasmota bootloader with the regular power adapter and the following command: |
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After seeing this error, user @tabacha was able to successfully flash his |
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device using the regular power adapter and the tasmota boot loader using |
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the following command: |
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``` |
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python esptool.py --chip esp32 -p /dev/ttyUSB0 --baud 115200 --before default_reset --after hard_reset write_flash -z --flash_mode dout --flash_freq 40m --flash_size detect 0x1000 bootloader_dout_40m.bin 0x8000 partitions.bin 0xe000 boot_app0.bin 0x10000 ~/Downloads/schlafzimmerbedlight.bin |
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``` |
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You will find the missing tasmota boot files here: https://github.com/arendst/Tasmota/tree/firmware/firmware/tasmota32/ESP32_needed_files |
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You will find the missing tasmota boot files here: |
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https://github.com/arendst/Tasmota/tree/firmware/firmware/tasmota32/ESP32_needed_files |
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User @tabacha was not able to use tasmota with the bedside lamp 2. |
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(remember that the [esphome-flasher](https://github.com/esphome/esphome-flasher) |
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will give you a bit less of a hard-core experience during flashing) |
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User @tabacha was not able to use tasmota with the beedlight. |
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Maurice Makaay
3 years ago