Timer 4 on the ATMega32U4 is a high speed one, but I have never tried it out before. Now that I have a scope, I decided to toy with it. It can work from the internal PLL, meaning some really high frequencies…
Scope screenshots
One of the cool things about having a digital scope is that you can take screenshots and post them in blogs :). I wanted to check how a Funky v2 was behaving, so hooked one to measure its current consumption…
Oscilloscope
I have finally decided to get myself an oscilloscope, my choice ended up to be a Rigol DS1052E. The model seems to be pretty popular, and for a price tag of 309 EUR with delivery, I could no longer resist.…
Trying out Funky v2 with the LTC3108 energy harvesting board
I have recently added a MOSFET to Funky v2 so it can control the power state of the RFM12B module. This was done in an attempt to allow starting up from a gradually rising power source, like the LTC3108 energy…
Funky v2 rev 1
I haven’t been able to use my miniature nodes the Funky v1 or Funky v2 with my energy harvesting board yet, in the means of plug-and-forget type of solution. Basically the issue is that we have a slowly rising voltage from…
Soil moisture sensing revisited
I have previously created a DIY soil moisture sensor, but wiring it required couple resistors. I was recently reading a post by JCW on using a light sensor and figured I could simplify my setup using the same basic idea…
RFM12B End of Life
EDIT March 2015: [It has been two years since this post, and the RFM12B is still widely available. I guess the rumors at that time were exaggerated widely.] There has been bad news for the RFM12B ecosystem last week, namely the…
73062 transmissions with the Funky v2 low-power code and CR2032 battery
The Funky v2 loaded with my low power test code that I described here has stopped sending transmissions yesterday. The Funky v2 was powered by a fresh CR2032 battery with 220mAh capacity. I use an integer counter that overflowed few…
Wallpaper prank
I wish I did this for April 1st, but here is it anyway 🙂 I wanted to test out the HID keyboard features of the Arduino Leonardo compatible Funky v2, so during my research on the subject I accidentally stumbled…
Auto reconnect WiFi on Raspberry Pi
For a number of reasons I have my DD-WRT-based router shut down WiFi at nights, that though causes some inconvenience to my Raspberry Pi. I have it connected with a RTL8188CUS based WiFi dongle, the cheapest found on eBay. The problem is that…
Software I2C test
The Funky v2 is so small in size, that only few pins are available on the side header. This is because its main purpose is to interface with one, at most couple sensors while running on battery. The hardware TWI/I2C…