As part of my RF24 sensor revamp, I thought I’d switch from the Jeelib low power routines to the Rocketscream library. It seems a bit unmaintained so I actually made a fork and merged in some of the PR’s which add support for the ATmega1284P and ATtiny85 and fix a few typo’s too. My fork can be found on Github. Anyway, whilst playing with my new rain sensor I thought it would be cool to save some battery power and only wake the MCU when it was raining, I didn’t need to be told it wasn’t raining every 3mins or whatever.

Next on the new sensors to play with list is a soil moisture sensor and the similar rain sensor, both use the same LM393 opamp comparator board. The pinout is: AO - A7 DO - D2 VCC - 3.3v GND - GND The digital output basically gives a 0/1 based on if the moisture/rainfall has reached a certain level (adjusted with the trimpot). My code is: const int aPin = A7; const int dPin = 2; int moisture = 0; bool isRaining = false; void setup() { Serial.

I’ve recently bought a few sensor modules for my planned revamp of my RF24 network. I also found this website which seems to be a guy who has been playing with many of the same sensors! First off we have the BH1750FVI light intensity sensor. I connected to a Nano like so: BH1750 - Nano3: VCC - 3.3v GND - GND SCL - SCL (a5) SDA - SDA (a4) ADD - Not connected The ebay listing says 3-5v power, and I must say I connected it to 5v just fine, but better go with 3.

I’m going to get back into making Arduino sensors for the house/garden. I’m going to use the RF24Mesh library this time instead of just RF24Network so that the sensors can forward packets along from each other, hopefully meaning that I can use the smallest radio modules instead of the PA+LNA variants which suck a lot more current e.g. 45-115mA instead of 15mA. I plan on using a bunch of 3.3v Sparkfun Pro Mini boards with the regulator/LED removed, and fed a clean 3.

I’ve been getting back into Vagrant and Ansible lately, as I decided I needed a platform to do some Continuous Integration testing of Arduino and packaging of arduino-mk; and also building Kodi on a faster platform than my Atom HTPC. As luck would have it, the Debian package for Ansible 1.9.2 just hit Sid, so I don’t have to build my own from git with “make deb”, which is a bit Ubuntu-centric and doesn’t work too well on Debian.