
Rudolph led driver
electricant/rudolph_led_driver
Driver for LED fairy lights using Li-Ion batteries

An add-on pressure sensor module for the unitree GO2 for foot contact detection
Go2 pressure sensor is an open-source printed circuit board by VincidaB, from the VincidaB/go2_pressure_sensor repository on GitHub. It is a 2-layer board of 17.5 × 19.6 mm with 11 parts on 8 nets, routed with 44 tracks and 22 vias.
It is built around the LP2980-ADJDBV. Its parts include 4 capacitors, 3 resistors, 2 ICs, 1 diode and 1 connector. It belongs with the sensors and measurement boards of this library.
The pressure sensor used is the GZP6859A040KPP33Z, as a replacement for the original XGZP6869A040 (Both have a pressure range between 0-40KPa).
The tube on the GO2 EDU is 1mm ID and 3mm OD silicone tubing, but I could make it fit on the pressure sensors, so I used 1.5mm ID instead. A small piece of tape or heat shrink can be used ont the foot side to make it fit better.
The screws needed are M2 length 4mm countersunk screws, the original being Philips head. 7 screws are needed per leg, for a total of 28 screws. They fix the tubing using two small plastic brackets than can be 3D printed, the files are in the 3d_models folder (4 of each must be printed).
By removing a plastic cover on the inner part of the leg, a connector is revealed, which connects to the sensor once it has been fastened :

One of the 3D printed brackets, fastened, holding the tube in place:

Here is the final PCBs manufactured and assembled:

| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric | C2 |
| 1 | 10pF | Resistor_SMD:R_0603_1608Metric | C3 |
| 1 | 1uF | Resistor_SMD:R_0603_1608Metric | C4 |
| 1 | 4.7uF | Resistor_SMD:R_0603_1608Metric | C1 |
| 1 | 51.1k | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | 5k | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 86.6k | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | Conn_01x03_Socket | Connector_JST:JST_GH_BM03B-GHS-TBT_1x03-1MP_P1.25mm_Vertical | J1 |
| 1 | D_Zener | Diode_SMD:D_SOD-123 | D1 |
| 1 | LP2980-ADJ | Package_TO_SOT_SMD:SOT-23-5 | U2 |
| 1 | XPGZP6859A | Ensmasteel_librairy:XGZ6859 6pin | U1 |

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It measures 17.5 × 19.6 mm and has 2 copper layers, 1.09 mm thick.
11 parts, built around the LP2980-ADJDBV. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the VincidaB/go2_pressure_sensor repository on GitHub, at the commit this page was made from: the board is go2_pressure_sensor.kicad_pcb and its schematic go2_pressure_sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask VincidaB before reusing the design.