Tag Archives: sensor

Sheldon robot: crash detection

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It’s sometimes handy to know when things are not going well – for example, when your robot’s collision avoidance systems have failed it and the poor, dumb critter has crashed head-on into something. You’d be surprised how often that happens. Work on my robot, Sheldon, is progressing slowly. I’ve just added some infrastructure (not shown in the picture) that will… Read more »

AVR basics: Using cheap ultrasonic rangefinders

As part of my cunning plan to develop ‘smart’ sensors, I’ve been playing around with infrared rangefinders (and may do a post on those soon). But the first kind of rangefinder I ever tried was the ultrasonic type, so it was time to reacqauint myself. And, in particular, I wanted to see if I could do this on the cheap…. Read more »

ESP8266 IoT room thermometer – part 2

Having cobbled together an ESP8266 microcontroller, temperature sensor and TFT LCD screen, the next step was to have the device talk to a server. There are two reasons for wanting to connect to a server: first, to get time and date updates; and second, to report the temperature and humidity so that the server can display them on an intranet… Read more »

ESP8266 IoT room thermometer – part 1

Impulsiveness is not always a good thing. So here’s a handy rule for you: first, prototype; then fabricate the PCBs. Doing it that way, things have a chance of going well. Reverse that order and … well, not so much. Not that it was a disaster. In fact I had prototyped this little project – mostly. But we’re getting ahead of ourselves…. Read more »