Poor man’s spectrum analysis with the RFM12B – scanning the 868MHz band to check how noisy my chosen channel really is.
Spectrum analysis with RFM12B
Using RFM69CW instead of RFM12B
Swapping the RFM12B for the pin-compatible RFM69CW – +30% range and better sensitivity for roughly the same price.
NodeRED RFM2Pi to emonCMS gateway
Replacing my python gateway script with Node-RED: RFM2Pi packets decoded and forwarded to emonCMS in a visual, easy to extend flow.
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.
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.
Installing emoncms’s “events” module
Installing emonCMS’s events module – rule-based alerts and actions on top of the telemetry my sensors already log.
Micro IoT gateway RFM12B shield update
The new uIoT RFM12B shield adds a plug-on OLED port – gateway and status display in one stack.
Reducing RFM12B transmission power
Reducing RFM12B transmission power to stop overloading nearby receivers – better link quality and lower battery drain.
Cheap USB to 3.3V TTL FTDI Cable goes to the trash bin
My cheap ebay ‘FTDI’ cable outputs 5V on the supposedly 3.3V lines – scope proof, two dead RFM12Bs, straight to the trash bin.
RFM12B End of Life
The RFM12B was declared End of Life – what it meant for my projects and the ecosystem. (Spoiler from 2015: it never really died.)
TCP/IP over RFM12B and Raspberry Pi as gateway
TCP/IP over RFM12B using the uIP stack – remote nodes reach the Internet through a Raspberry Pi gateway.
Funky v2 as RFM12B to Raspberry Pi gateway
The Funky v2 as an RFM12B to Raspberry Pi gateway – it enumerates as CDC over USB, keeping the Pi’s GPIO header free.
New RFM2Pi board in the works
The new RFM2Pi board Glyn Hudson and I are working on – ATmega328, internal 8MHz oscillator, SMT layout for the Raspberry Pi.
RFM2Pi firmware updates
RFM2Pi firmware fixes: random serial gibberish could switch the board’s nodeID, so commands now require deliberate input.
Atmega32U4 based micro node with RFM12B
Rethinking the Funky: an ATmega32U4 micro node with RFM12B – native USB means no ISP programmer and no core installs for users.
Clocking the Funky sensor from RFM12B’s crystal
Clocking the Funky’s ATtiny84 from the RFM12B’s crystal – stable timing for IR and RF experiments the internal oscillator can’t do.
RFM12B to Raspberry Pi board
Discontinuing the TinySensor in favor of the Funky, and a dedicated RFM12B to Raspberry Pi board is coming – the RFM2Pi’s origin.
RFM12B shield for the micro IoT gateway
3D render of the RFM12B shield for the micro IoT gateway – keeping the top free for micro SD and other expansions.
Clocking ATTiny84 from RFM12B (thinking outloud)
Thinking out loud on clocking the ATtiny84 from the RFM12B’s crystal – a stable external clock without spending an extra part.
RFM12b to serial PCB for my Pi
A small home-made PCB that permanently fits the RFM12B-to-serial module on my Raspberry Pi – simpler than the native SPI efforts.
Capture, decode and log to emoncms RFM12B packets on Raspberry Pi
Capturing RFM12B packets on the Raspberry Pi, decoding them and logging to emonCMS – the receiving side of my sensor network.
Sending JeeLib compatible packets with ATtiny85 + RFM12B
Sending JeeLib compatible packets from an ATtiny85 + RFM12B by porting an old AVR library to the Arduino IDE – no Jeelib needed.
Experimenting with ATtiny85 + RFM12B
Getting an ATtiny85 to drive the RFM12B – 8 pins, 8KB flash, and enough for a working remote sensor unit.
Interfacing RFM12B to Raspberry Pi for cheap
Interfacing the RFM12B to the Raspberry Pi for cheap – a TinySensor on the Pi’s UART relays packets onward to emonCMS.
ATtiny84 remote temperature sensor with RFM12B
An ATtiny84 remote temperature sensor with RFM12B – JeeNode Micro envy turned into my own single-chip wireless node.
Controlling 433Mhz RF power sockets with a RFM12B module
Controlling 433MHz RF power sockets straight from an RFM12B module – appliance switching without wiring a single relay.
RFM12B and Arduino Ethernet with WizNet5100 chip
Getting the RFM12B and an Arduino Ethernet (WizNet5100) to coexist on SPI – working around the nasty W5100 bus bug.