Running on ‘dead’ batteries

I have a load of used AA/AAA batteries (0.9-1.2V), that I keep to run my LTC-3525 enabled projects like Funky v1 and v2; however the LTC-3525 will work down to 0.8V so the batteries are declared ‘dead’ for a second time after their voltage drops below that level. I decided to try out such a…

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 the energy harvesting board, but the RFM12B will consume 0.68mA until fully initialized and put to…

Energy harvesting breakout board

I have put up a small LTC3108 breakout board based on Robert’s design that I also tested out. A re-cap for those that didn’t follow my energy harvesting posts: The LTC3108  is a highly integrated DC/DC converter ideal for harvesting and managing surplus energy from extremely low input voltage sources such as TEGs (thermoelectric generators), thermopiles and small…

Using the LTC3108 breakout board with a TEG

As I mentioned already, I burned my old Peltier element before receiving the LTC3108 breakout PCB, so I couldn’t test that setup. So I went and hooked a solar cell, but the configuration I have on the PCB is not optimal for solar usage: I need another transformer ratio and different capacitor values. I have ordered…

Using the LTC3108 breakout board with a solar cell

EDIT: I used the wrong solar cell in this experiment, using a single solar cell 0.5V the supercap charges fully for less than 45 min I wired my LTC3108 breakout board this morning to a 120x80mm solar cell, shamelessly scavenged from a perfectly working solar Christmas decoration. I punched in a 1F (whoa) super capacitor rated…

Energy harvesting

I have mentioned before my interest in energy harvesting, and have decided to try Robert’s LTC3108 breakout board. The Funky sensor is all about low power, so it is an ideal candidate for battery-less low power node. I got the PCBs today and quickly built one, my original intention was to use it with a…