Sensor Pilot: A Progressive Web App (PWA) for Bluetooth Sensors

From kaspars.net 2 years ago in Blogs Podcasts

Did you know that Chrome-based browsers (including on Android phones) can interact with Bluetooth Low Energy (LE) sensors and devices without any additional software using the Web Bluetooth API? Bundle that with the off-line features enabled by the progressive web apps (PWA) and we get a real application using pure...

Articles from Kaspars Dambis

Notes on Tuya Air Quality Sensors

From kaspars.net 4 weeks ago in Blogs Podcasts

These are two devices with an identical air quality sensor for PM2.5 and PM10 (boxes with metal cover in the middle), temperature and humidity (top center) that are connected to Tuya controllers with either WiFi or Zigbee radio. The 6in1...

Using Ventilation Air for Heating and Hot Water

From kaspars.net 4 weeks ago in Blogs Podcasts

The Passive House standard has two magic numbers related to the heating and cooling requirements for buildings — 15kWh is the maximum allowed heating and cooling demand per square meter per year and 10W maximum allowed instantaneous heating or cooling...

Notes on Zemismart HomeKit Zigbee Hub

From kaspars.net 4 weeks ago in Blogs Podcasts

Zemismart ZMHK-01 is one of the few hubs that is compatible with Apple HomeKit and can expose non-HomeKit Zigbee devices in the Home app similar to the Aqara G2H camera hub. Behind the scenes it uses the Tuya TYZS4 radio...

Use Hiking DDS238-2 ZN/S Energy Meter with Home Assistant

From kaspars.net 1 month ago in Blogs Podcasts

Hiking DDS238-2 ZN/S is a cheap €25 single phase energy meter which can measure import and export energy in addition to all the standard parameters, and has a Modbus interface over RS485. I used this Modbus registry information to create...

Use Aqara G2H Zigbee Camera Hub with Home Assistant

From kaspars.net 1 month ago in Blogs Podcasts

Aqara G2H (ZNSXJ12LM) is a really nice Zigbee hub and indoor camera with official HomeKit support. Of course it runs Linux so people have discovered ways to connect it to Home Assistant which exposes most of your HomeKit devices to...

Notes on Gree Amber Nordic GWH09YD-S6DBA1 Heat Pump

From kaspars.net 3 months ago in Blogs Podcasts

As part of an experiment to add domestic water heating capabilities to conventional mini-split ACs, I purchased an air-source heat pump Gree GWH09YD-S6DBA1 which has an inverter controlled compressor and an electronic expansion valve that allows it to work efficiently...

Notes on MySensors

From kaspars.net 4 months ago in Blogs Podcasts

MySensors is a great project for building IoT devices but it tries to do many things — define a general serial communications protocol (similar to ModBus, CAN), provide a software library for many hardware devices on top of the Arduino...

WireGuard on MikroTik RouterOS

From kaspars.net 5 months ago in Blogs Podcasts

WireGuard can be used for a lot of things: Managing router configuration remotely behind NATed networks such as mobile connections. Connecting to your home network while on the road for home automation and safe internet access. Connecting several networks over...

Using Mini Split Air Conditioner for Space and Hot Water Heating

From kaspars.net 7 months ago in Blogs Podcasts

Mini split air conditioners are great little air-source heat pumps that can work in the reverse and provide heating to the building, too. For highly insulated houses built according to the Passive House standard they technically provide enough power to...

Notes on Lollette LE3U PLC

From kaspars.net 8 months ago in Blogs Podcasts

Lollette LE3U is a “copy” of the Mitsubishi FX3U PLC for $60 on AliExpress while the original costs around $1000. All configuration is done using Mitsubishi’s proprietary software GX Developer or GX Works2 which cost another $500 but have a...