There is another version that is not using LVGL:
Note
⚡ Eletronics are dangerous
🤓 Tinkering with your smart desk might void your warranty. Proceed with caution. I tested it with one specific desk and one MCU series.
I got inspired by Adrian's ESPHome touch display mount and Mick's LoctekMotion IoT project, so thanks for this opportunity!
Basically, I first found the printable screen mount on Makerworld and then started tinkering around my Flexispot-Desk.
I got a Flexispot E7Q, also sold as Odin/E7Q Pro in the English-speaking market:
- Flexispot Odin (EN)
- Flexispot E7Q (DE)
- It is using a HS13B-1 controller, pinout similar to the HS01B-1
- If the table/controller does not respond, try unplugging the RJ45 connectors to your display(s), whether it's an ESP32 or the original Loctek MCU which is probably STMicroelectronics-based.
- Different versions of the "cheap yellow display" – Mine has two USB inputs (USB-C and Micro-USB). The mounting holes were slightly off, so I used a 4/6mm drill to fix it (carefully).
- Set limits for the desk - Or the table will crash or interfere with obstacles.
- Disable the hardware UART or at least the console on the ESP32.
- Not all pins are needed for this project. At least the 🟣purple, ⚪white, 🟤brown wires from the original cable are not required (SWIM and Reset are probably needed to program the controller in the factory).
- If you're unsure about the pinout, open the original controller and write down the cable colors and its function. I can also recommend the archive page on the LoctekMotion_IoT-Prject or a simple google search to find the correct pins.
- The inbuilt display graphics from ESPHome are quite slow, so if you're having live values on the screen, then it is probably too slow. The new YAML for ESPHome features LVGL
You might need some physical and virtual tools, such as: a screwdriver, pliers/something to trim the ethernet cable, 3d-printer, ESPHome installed within Home Assistant and some technical knowledge (not really programming, but you should be able to read those YAML files etc)
| Part | Count | Price (€) | Comment |
|---|---|---|---|
| ESP32-2432S028 | 1 | ~17€ | "cheap yellow display" 2*USB: ESP32-2432S028R (eBay) |
| Small screw | 2 | ~0.10€ | ~3.5x16 (flathead), screws to connect the 3d-printed mount with the base |
| RJ45-Push Fit-Keystone | 1 | ~2.50€ | Easy RJ45 breakout-socket: RJ45 Keystone Adapter (Amazon) |
| RJ45-Patchcable 2m | 1 | ~4€ | Connects controller and keystone module: RJ45 Keystone Adapter (Amazon)) |
| Surface Mount Keystone RJ45 | 1 | - | 3D-printable: Makerworld Model |
| Touch Display Mount | 1 | - | 3D-printable: Makerworld Model |
| Flexispot E7Q Desk Frame | 1 | ~700€ | Other tables/controllers might be compatible Flexispot E7Q (DE) |
The following picture and the tables showing the pin usages/assignments, cable colors for the RJ45-wiring
This table shows the RJ45 pin assignments with the corresponding wire colors for LoctekMotion HS13B-1 and Ethernet T568B wiring standards.
| RJ45 Pin | Name | HS13B-1 Color | Ethernet / T568B Color |
|---|---|---|---|
| 8 | +5V / VDD | 🟡 Yellow | 🟤 Brown |
| 7 | GND | 🔵 Blue | ⚪🟤 White-Brown |
| 6 | TX | ⚫ Black | 🟢 Green |
| 5 | RX | 🟢 Green | ⚪🔵 White-Blue |
| 4 | PIN 20 | 🔴 Red | 🔵 Blue |
| 3 | N/A | 🟣 Purple | ⚪🟢 White-Green |
| 2 | SWIM | ⚪ White | 🟠 Orange |
| 1 | RESET | 🟤 Brown | ⚪🟠 White-Orange |
Example: Yellow cable/Pin 8 is used for +5V voltage on the Loctek RJ45, it will be Brown on a standard ethernet cable. 🟡->🟤
Here is an overview of the ESP-Pinout. Unfortunately, some Pins have multiple functions, preconfigured pullups, so i used the hardware UART and IO22. The Pin headers are 2/4 pin JST headers, 1.25mm pitch
Picture source: reddit.com
The following table shows the pin assignments for the P5 connector. All four pins are required, used for power and data.
| Pin | Function | Color (JST) | Color (T568B) |
|---|---|---|---|
| 1 | Vin (5V) | 🔴 Red | 🟤 Brown |
| 2 | TXD | ⚫ Black | 🟢 Green |
| 3 | RXD | 🟡 Yellow | ⚪🔵 White-Blue |
| 4 | GND | 🟢 Green | ⚪🟤 White-Brown |
- If you use USB while connected to the desk-controller, UART0 is blocked. So please disconnect USB and power the CYD just via the Desk or use another serial port (which is sharing its pins with the Led) . See that issue on the repo
The following table shows the pin assignments for the CN1 connector. Only IO22 is required, GND is optional, already satisfied by the first connector.
| Pin | Function | Color (JST) | Color (T568B) |
|---|---|---|---|
| 1 | 3V3 | ⚫ Black | |
| 2 | IO22 / PIN20 | 🔵 Blue | 🔵 Blue |
| 3 | IO27 (Pullup 10k 3V3) | 🟡 Yellow | |
| 4 | GND | 🔴 Red | ⚪🟤 White-Brown |
Legend:
- ⚪🟠 = White in combination with the second color of the twisted pair e.g. ⚪🟠 = White-Orange, 🟠 = Orange
- Ethernet colors are based on the T568B standard, if using T568A, the connectors use other colors
- Bold means this pin or function is mandatory
- JST (P5/CN1) wire colors might differ, please check it carefully.
I decided to hop on that train and use ESPHome (quite new for me). I will provide two YAMLs which can easily installed from the Home Assistant GUI/ESPHome Addon.
This one is basically a fork of ESPHome-touch-display-mount but instead of using other HA components, i enabled it to control the LoctekMotion/Flexispot Desk.
The UI is nice, but there are some considerations:
- In case the display is updated, that will take some time, so to get rid of that I decided to show no live values when manually lowering or rising the desk.
- 8 Bit color only, in the current (02/2025) ESPHome release there is a bug, so there's a workaroud
- Loads of YAML and lambdas, the UI is in German at that time, so if you're into translating it, you should probably adjust the weekdays. BTW: Höhe means height in German
- Only two presets are used: Preset 1 and 2, I did not use the "sit" and "stand" preset
- Buttons are deactivated in yaml, but no visual feedback for the user
- HA Time Sync replaced with NTP, but you can change that at any time
- Glyphs (for the symbols) and Letters adjusted, used anchors in the yaml
Here you will find flexispot-e7q-esp32-2432s028-default_graphics.yaml
Still there are many parts from ESPHome-touch-display-mount and the LoctekMotion IoT project there is LVGL to control the display, buttons and its UI
Some special things about this one:
- 16 Bit graphics and even faster then default_graphics
- The bar-graph at the bottom indicated the current height. The min/max values are used from the yaml, even if its below or above that (those desks tend to overshoot a little)
- Less lambdas for the buttons, buttons have automatic touch mapping and still: Buttons are deactivated if certain heights are below or above a treshold (Up/Down button)
- More or less useful features, such as a bootlogo, status icons, burn-in prevention for the lcd, and even flash-stored information on the last preset beeing used
- The UI is less appealing than the first version, but its more flexible and faster (live height-data during movement)
- Its still not a finished product, so please take some time to validate if thats fine for you
Here you will find flexispot-e7q-esp32-2432s028-lvgl.yaml
