Tagged: Hack

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Linked List: Three Firefox Add-ons for Power Users

A browser is q sandboxed area where you can access, view, and manipulate the data. Somehow the ability to manipulate the data (website) locally; to suit users’ needs doesn’t get noticed much. This feature is a potent tool in the hands of capable users. The following addons will add to that users’ power.

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Moving away from Feedburner

There was a small but dedicated set of users subscribed to this blog using FeedBurner feed. FeedBurner was working, but it’s virtually dead. So this week, I decided to move my feeds away from FeedBurner.

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Simple BLE Oximeter App using PHONK

In the past I would have used MIT AppInventor or Expo.io. Both have amazing ecosystems. It’s easy to build apps using them. But this time I wanted to use PHONK. I had used Protocoder before and had liked it. Also I have this idea of building small utility apps called applets (yes!), that...

Bluetooth Oximeter 0

Reverse Engineering A Bluetooth Low Energy Oximeter

Just as COVID-19 is spreading in Bangalore. I got an Oximeter which can measure SpO2. SpO2 is also called as oxygen saturation, According to Wikipedia Oxygen saturation is the fraction of oxygen-saturated hemoglobin relative to total hemoglobin (unsaturated + saturated) in the blood. The human body requires and regulates a very precise and...

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How to create Sparklines in LibreOffice Calc

I love using sparklines. I use them everywhere from Google Sheets to web pages. Popularized by Edward Tufte. It’s usually a small line chart without axes or coordinates. Like this . I like them because they go very well with text, without disturbing the flow but significantly adding to the information display. Sparklines...

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Reverse Engineering iTag – A Bluetooth Low Energy Button

Couple of weeks back I bought a few iTags. These are simple BLE buttons. They have a small led, a button and a buzzer. CR2032 – a 3v coin cell battery powers it. Since they are Bluetooth Low Energy devices, a single cell can power them for years. It’s easy to change batteries...