Blog

Z-Wave vs Zigbee

Home automation is quite popular now in most household and it is common to see retailers dedicate quite a lot of display space to them.  I was in a local Best Buy store recently, and was delighted to find a few aisles of home automation products on display and...

To Cloud or Not to Cloud?

It is a cloudy morning today, but we are not talking about the weather.  Cloud services are quite popular now and are available quite abundantly and down-to-earth.  There are many discussion in the corporate world regarding availability, reliability, and security for enterprise level type of cloud services.  But how...

Rectangles – Intersection Study

Have you ever walk into a job interview, and were asked to design a program to find if 2 rectangles intersect with each other or not? This apparently is a common “technical” question in a job interview. I do agree that it is an interesting question to evaluate your...

Hass.io – Have an Old IP Camera?

Do you have an old IP camera that you are still using at home? I have 2 of them. This is a Foscam FI8910W camera.  It had its glorious days many years ago, and it still working, as older hardware are built to last much longer. This camera has lots...

Math puzzle 2 – answer

Ok, let’s do some analysis and deduction here. Let’s look at the facts provide to us. Fact #1: with the coins, the cashier can not provide change in coins, a dollar, half dollar, quarter, dime, or nickel. Let’s simplify the situation by figure out what’s NOT possible. She can...

Hass.io – Push Notification

When there is a problem, there is a solution. What is the problem? We’ve been experiencing intermittent slow down which download speed just goes up and down unexpectedly.  I already have internet speed test scheduled on my Home Assistant (HA) every 15 minutes, but what I would really like...

Math Puzzle 2 – Change for a Dollar?

It is a lazy and hot Saturday morning in the summer, in case if you need something to exercise your brain without any sweat, here is an interesting problem to solve. A customer walked into a small local store, customer asked: “Good morning.  Can you please give me change...