I’ve redesigned my Arduino weather station to incorporate a P-channel MOSFET to switch power to the peripherals on and off to hopefully save battery life. The ATmega328P always gets 3.3v, but then uses Sleepy() to conserve power anyway, but the DHT11, BMP085, DS18B20 and nRF24L01+ get powered off when not in use. Oddly enough the voltage seems to drop to 0.7v rather than 0v completely, but I guess no current flows.

I’ve redesigned my internet radio project – now it features an amplifier with 12v 2A power supply, which is split off to a 5v UBEC to power the Pi via its GPIO pins. The amplifier powers the speakers so the only USB connections are the DAC and wifi dongle. The sound is much louder and there is no hum or whine like before – I think that was a ground loop or antenna issue with all the USB cables and hub.

I thought I’d do something with my Pi camera board, so took my Dremel to my Pi’s case and cut a slot for the camera cable to go through it. I also made a protective cover for the camera board out of a SD card case. I took a still photo every minute for 2.5 hours (about 148 images total) at 720p using the following syntax: raspistill -o image%04d.jpg -t 9000000 -tl 60000 -w 1280 -h 720``` Then merged them all into a soundless 5fps x264 video using mencoder: ```bash mencoder mf://*.

I’m thinking of getting back to my Raspberry Pi internet radio project again. A few weeks ago I found that the pulsing from the wifi card was caused by a ground loop problem with the USB hub, as I got the exact same problem on the BeagleBoneBlack. So I’ve bought a Lepai TA-2020A+ amplifier and 12V 2A PSU to power it. I plan on making a little board to tap off 5V 1A via a 7805 to power the Pi.

I’ve installed Debian Sid on my new laptop, everything works except the SDcard reader, which causes suspend to kernel panic (LKML thread) the workaround is to blacklist the rtsx_pci module. I had to use Jessie (Sid) as Wheezy doesn’t have the wifi drivers in its 3.2 kernel, Sid’s 3.12 kernel does though, but that’s where the SDcard bug comes from! Ubuntu 13.10 has the 3.11 kernel built-in and the liveCD picked up the wifi just fine.