Funky v3 PCBs populated and briefly tested – double-row headers soldered on the test unit, first impressions of the new board.
Funky v3 PCB populated
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.
Raspberry Pi email/SMS doorbell notifier + picture of the person ringing it
Step-by-step Raspberry Pi doorbell notifier: email/SMS plus a webcam snapshot of whoever is ringing. A simpler follow-up to my SMS doorbell.
High AC mains voltage
My house sits second to the transformer and the multimeter agrees with the cheap one: AC mains voltage is high. Time to log it properly.
Reducing RFM12B transmission power
Reducing RFM12B transmission power to stop overloading nearby receivers – better link quality and lower battery drain.
Temperature to color encoding for visual status display using RGB LED
Encoding temperature as RGB LED color – read the solar hot water status from across the room, no display needed.