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New track released – Revival
Listen on
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Mo’ music – Ratio released
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I’m on Spotify
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DHT11 Temperature and humidity sensor
So, I just bought two DHT11 sensors for a small project. From the specifications:
- Humidity from 20-80% humidity readings with 5% accuracy
- 0-50°C temperature readings ±2°C accuracy
After wiring them up on my breadboard, I find the following:
- DHT11 (number one) reports 20% humidity and 20 degrees celsius
- DHT11 (number two) reports 30% humidity and 24 degrees celsius
In other words – I got two sensors reporting within accuracy range, but with maximum deviation in both directions.
I guess I should be pleased – provided both sensors would be placed at the same location, the combined readings would provide me with something very close to reality…
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Execute on file change
You have all been there – wanting to execute something whenever a file or a set of files changes. There are several tools that will help you, but so far entr is the simplest, most no-nonsense solution I have found.
I’ve been using it the past few days when creating a dynamic nginx reverse proxy config with consul-template, and it works like a charm.
Go check it out – it is available through apt on ubuntu and brew on OSX.
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Semantic versioning, git flow and tags
I have a lot of minor projects that follows the semantic versioning standard. Coupled with git flow this makes my life a little easier. Life can always get easier though, so here is a very rudimentary script for retrieving next version from the latest tag in git:
#!/usr/bin/env ruby
inc = ARGV[0]
version = `git describe --tag $(git rev-list --tags --max-count=1)`
v = Hash[[:major, :minor, :patch].zip(version.split('.'))]
case inc
when 'major'
v[:major] = v[:major].to_i + 1
v[:minor] = 0
v[:patch] = 0
when 'minor'
v[:minor] = v[:minor].to_i + 1
v[:patch] = 0
when 'patch'
v[:patch] = v[:patch].to_i + 1
end
puts v.values.join('.')
put it somewhere in you path, and call it something like nextver, and the next time you are doing a release, just run
git flow release start $(nextver minor)
No need for checking what the last release was, it is automagically handled:)
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Gitlab CI, docker and gem testing
I am using the Gitlab-CI server to handle my CI needs, and sometimes I find workarounds that might be worth sharing.