Where do this blog’s visitors come from? Two years of Google Analytics data visualized in Tableau, out of pure curiosity.
Hello, world
The YAPM PCB is done
The YAPM (Yet Another Power Monitor) PCB is done and preliminary tests pass – built between a new job and scarce hobby hours.
Hot water tank controller project – part 2
Hot water tank controller part 2: code finalized, a week of runtime, and a small HTML page driving it through an emoncms.org feed.
Smart IoT solar hot water tank controller
A smart IoT controller for my solar hot water tank – mode switching (manual/auto/anti-freeze) driven by an emonCMS feed.
Funky v3 PCB populated
Funky v3 PCBs populated and briefly tested – double-row headers soldered on the test unit, first impressions of the new board.
OLED status display on the RFM2Pi board
The RFM2Pi board gets a 6 pin port that happens to exactly match the Digole 0.96″ OLED – instant plug-on status display.
Funky v3
Funky v3: a major reshuffle of the v2 board routes 8 more pins (D9, D7, D12, D6, A3, A4, D0, D1) to pads in the same tiny form factor.
Yet another power monitor
Yet another power monitor – this one runs off a small dual-winding transformer that both powers the circuit and senses voltage.
Analysis of electricity usage per year
Comparing this year’s electricity usage against last year’s – checking whether all my energy use optimizations actually show in the kWh.
Thoughts on AVR ADC accuracy
How accurate is the AVR’s internal bandgap battery measurement? Comparing it against a Fluke 27 and digging into the datasheet numbers.
emoncms base-station with SD card based .ini file configuration
An emonCMS base-station configured from an .ini file on SD card – no re-flashing a NanodeRF for every user-specific setting.
CR2032 battery discharge pattern
9 months and 10 days on one CR2032: the discharge pattern of a coin cell powering a Funky v1 + DS18B20 room temperature node.
Clapping to control RF power sockets
Clap-controlling RF power sockets with a Funky v2 and a cheap sound sensor breakout – silly, fun, and it works.
Raspberry Pi kernel with Frame Buffer TFT support
Adding FBTFT frame buffer support for the 1.8″ TFT to Raspbian in 5 minutes flat – @notro’s work ends the kernel patching nightmare.
Door sensor
Toying with a cheap magnetic reed switch door sensor – wireless open/close events for doors and windows via a Funky.
Domestic hot water for free
Domestic hot water nearly for free – my hacked Daikin air-to-water heat pump captures heat in both heating and cooling modes.
Rock-solid RFM2Pi gateway solution
A rock-solid RFM2Pi gateway: after killing several SD cards, the Pi now boots read-only and survives every power failure.
Raspberry Pi root file system in read-only mode
Mounting the Raspberry Pi root file system read-only – the next step after USB flash also proved corruptible on power loss.
Every μA counts
Every μA counts on battery powered wireless nodes – the hardware and software tricks I use to keep sleep current microscopic.
Non-contact AC detection
Non-contact AC detection with a 1M resistor and a wire antenna – testing insideGadgets’ trick and learning why it works.
Trying out bistable/latching relay
Trying out a Ciseco bistable/latching relay – a brief pulse to switch, zero holding current, pretty cool for battery projects.
Raw infrared <> serial
Raw infrared to serial and back – one interface for every IR protocol my air conditioners, TVs and media gear happen to speak.
Installing emoncms’s “events” module
Installing emonCMS’s events module – rule-based alerts and actions on top of the telemetry my sensors already log.
Pong clock on Raspberry Pi + 1.8″ TFT
A pong clock on the Raspberry Pi and my 1.8″ TFT – adapting Don Clark’s code for the ST7735R frame buffer.
Micro IoT gateway RFM12B shield update
The new uIoT RFM12B shield adds a plug-on OLED port – gateway and status display in one stack.
Putting Raspberry Pi’s hardware watchdog to work
Putting the Raspberry Pi’s built-in hardware watchdog to work – automatic reboots when the Pi hangs, no external hardware.
Moving the root file system of Raspberry Pi to external USB drive
Three corrupted SD cards later: moving the Raspberry Pi root file system to a USB drive to survive our frequent power outages.
Flood alarm
A wireless flood alarm after my father’s leaking pipe flooded his place for days and cost thousands of Euro – cheap insurance.
Funky v2 revision 2
Funky v2 revision 2 adds a reset button – no more unrecoverable boards when a sketch disables USB to save power.
Tweeting coffee machine using Raspbery Pi
Connecting my coffee machine to Twitter with a Raspberry Pi – a silly social appliance and a good learning exercise.
Wireless body temperature monitor/logger
A wearable wireless body temperature monitor for sick kids – remote logging plus a bedside status display with an alarm.
OLED analog clock
Adding an analog clock face to my OLED status display, plus a bitmap thermometer tracking the solar water tank temperature.