Clocking ATTiny84 from RFM12B (thinking outloud)

I have been thinking on the possibilities to use external clock source for my ATTiny84 projects for some obvious reasons. Using the internal oscillator works great in most cases, but may not be so accurate in some applications (IR,RF) as it depends on the VCC and temperature. You can measure both in the code and adjust…

Updating my SMS doorbell

I have made some updates to my SMS doorbell project. Previously, I had troubles setting up the email notifications in emoncms, the problem is that I don’t have shell access to the server where I host it so I could not install PEAR email. So I modified emoncms to use the in-built emailing rather than third…

‘Funky’ sensor in store

I have received permission from Tobias Floery to offer my version of the Funky Sensor in the store. I will be offering three options PCB only – for those that can do the soldering and only need the PCB “Regular” Funky – this is the Funky sensor less the voltage step-up circuit. Useful when you will…

Hooking my wireless doorbell to the Internet

Here is a fun project: hook my wireless doorbell to the Internet and get SMS when someone rings it. Useful when I am not at home or am in the backyard and can’t hear it, but I carry my mobile phone with me. My wireless doorbell is some cheap model that Google doesn’t even find,…

RaspberryPi+TinySensor as EmonBase

I now have working setup with a TinySensor + Rasberry Pi  acting as an emonbase. I previously used PHP for this task, but the PHP serial class seems to have some issues on the transmission part plus it was a bit “heavy” for the CPU. I have created a perl script that will read the serial…

Solar Funky

I thought it would be a nice experiment to put the Funky in a solar-powered garden lamp. I got one recently with the intention to use it for that particular experiment, it is quite cheap, costs a little over one euro. Inside we have a rechargeable battery of unknown type. I’d assume it is NiMH, it is size…

64 800 transmissions

The CR2032 battery powered TinySensor that I had set up to monitor my house’s power consumption has stopped sending packets yesterday afternoon, totaling 7.5 days of transmissions every 10 seconds. That would mean 6 * 60 * 24 * 7.5 = 64 800 transmissions were sent. Here is the battery discharge pattern: It last sent around…

Getting Funky

Catchy title, right? I ordered some Funky Sensor PCBs after few days ago and got them today. Just to recap – this is an extremely small Attiny84 based sensor with RFM12B module on top. I can’t stress how small it is, it is just slightly larger than the RFM12B board. My version is different from…

CR2032 powered “current only” remote monitoring

I am experimenting these days with one of the old versions of the TinySensors trying to see how long it can go with some heavy duty tasks, powered only by a single CR2032 battery. I wrote a small sketch to measure current using the on-board voltage divider, calculate apparent power based on assumption of fixed…