Lilium JSN

Sunday, March 5, 2023

Agricultural IoT Station

Autonomous agriculture IoT GSM station.

OpenLevo - Wave Characterization Buoy

Copyright - OpenIT

OpenLevo is a smart buoy that utilises the latest advancements in the MEMS-based sensors and IMU-Fusion algorithms to measure directional waves. The device can capture significant wave height, wave period and wave direction precisely, without any maintenance, sensing the 3D motion.

Using power-efficient sensors, solar energy and satellite coverage, OpenLevo can be deployed in the sea or lakes and report meaningful wave characteristics around the world 24/7. Wave sensing buoys can improve sea forecasting models, have an important role in research programs and act as a valuable source of information for emergency situations.

Saturday, October 22, 2022

PointAir - Smart devices on your hand

PointAir is a WearOS 3 app that brings home automation to your hand. You can just point to a device and send a command to it. It works by using BLE advertisements of the hand's pointing vector through one BLE anchor device per room. Smart devices are configured per room and pointing vector. The anchors detect the room by rssi and the watch advertises the pointing vector.

Friday, June 10, 2022

Edifier R1280T Generic Remote Hack

Modded Edifier R1280T to change volume with Samsung or any other remote. I used an esp8266 which reads the IR command, and communicates with the onboard amplifier (TAS5713) through I2C in order to change the volume. There is a black tinted OLED in front of the speaker that lights up when volume changes. The ESP is also connected to home assistant through mqtt so it can generate other commands from IR remote button presses. Source code available as a platformio project, and 3D printed parts in .3mf format.

Source Code

Tuesday, March 17, 2020

MaCo FEM Simulations

Coil Flux

Coil Force

Magnet Array Flux Cross Section

Magnet Array Flux 3D

Lorentz Force Results: 6.5N per axis @ 1amp ~ "0.5Kg of force"

Thursday, July 4, 2019

Voice Coil Redesign for Maco

Project Maco redesign tries to create a 2DOF force/haptic feedback analog stick for gamepads.

Using rotary voice coil motors (like HDD positioning motors) we accomplish both force and haptic feedback to the thumbs of the user, plus the linear connection between Force and Current from Lorrentz law for constant field density (F=BnLI). Final targets are:

3D print the whole design (FDM the bigger parts and maybe SLA the smaller ones) and use consumer fittings (bearings, bushes) wherever needed in order to avoid vibration damping and backlash.
Drive the VCMs with the appropriate electronics. Usually, for ERM or LRA actuators, one can use haptic driver ICs like DRV2603 from Texas Instruments, but we also need to drive the VCMs like linear force motors so this scenario is not matching. Also, the available IC drivers for haptic provide very simple functions for click like or vibration like events, no haptic texture or dynamic forms of feedback are available. So, we will use an H-Bridge IC and run it like a D-Class amplifier using low-pass 1KHz filters to cut most of the audible and noisy harmonics from the motor, most probably a DRV8835 which has high freq PWM signalling. The H-Bridge will be driven by a uC, probably a 328P if 16MHz are efficient enough, using PDM signalling to accomplish as smooth current transitions as possible.
Research and develop haptic libraries and force feeback scenarios, like walking a game character on snow, grass, or sand and having "force 3-D valleys", where in xy is the thumbstick position and in z is the needed force. With the latest example something like a cars gearbox can be simulated where the user switches gears with the right analog stick which feels exactly like a car's stick transition pattern.
Develop simple 2-D or 3-D games where users can play using the Maco and obtain feedback regarding the UX in different scenarios.