Category: Electronics

  • How to SSH to a Raspberry Pi on 4G

    How to SSH to a Raspberry Pi on 4G

    The reason you can’t just connect directly to a Pi (or other device) directly when that device is connected by 3G/4G is because network operators run something called Carrier Grade NAT, or CG-NAT. This has the effect of preventing all inbound connections to your Pi, and only allowing outbound connections. But fortunately, there’s a relatively…

  • Voice-controlled blinds with Amazon Echo

    Voice-controlled blinds with Amazon Echo

    For Christmas, I bought my Dad an Amazon Echo Dot. Its listening capabilities really impressed me, and it got me thinking about what features it offered to developers. After looking into the Alexa Skills API, and seeing how easy it was to get started, I decided I just had to buy one for myself. But I needed…

  • Drive My Internet-Controlled Car!

    Drive My Internet-Controlled Car!

    Radio controlled toy cars don’t normally have a Raspberry Pi, 10 batteries and a stripboard loosely hanging off them, but this isn’t your standard RC car. The primary goal of ICC was to enable a toy car (which has now become a robot, as seen in the image above) to be controlled in real-time over…

  • PiDoor – Security Door Lock v2

    Some readers may recall my old security door lock, which I made about a year ago. It was controlled with just a single AVR, which proved very inflexible. Though in theory it was capable, it was very limited unless I spent a lot of time and effort interfacing with an internet connectivity module. While that…