To use ThingsBoard data in other applications, you can pull the latest telemetry from the API. Details for the API and background about obtaining the JWT token can be found at ThingsBoard Rest API. The
As well as graphing, wouldn’t it be useful if ThingsBoard could send a mail alert when a particular parameter for a device goes above/blow a threshold, or when telemetry has not been received for a
Thingsboard is a great IoT logging platform, however some management of data can be impossible to do from the GUI and can get annoying. The following database hacks provide a workaround to some of the
See details about the PCF8574 board in the Micro:bit notes. Write example, sets all inputs high then low:
Using a 4×4 keypad and a 16×2 LCD screen, can you construct a simple calculator? Step 1: Connect up the hardware. Review the notes on keypads and LCD screens, make sure you understand how they
Keypads make a convenient way to add lots of buttons to a Micro:bit and they come in a range of sizes. The type above are known as membrane keypads. They have a sticky back, are
The Micro:bit comes with 20 IO (input/output) pins which can be used to connect a range of hardware devices, however if you look at a pinout diagram, you find that 8 of these are used
A LCD screen is a great way to give more feedback to a user, either for a text message or values back from a sensor. Known as a 1602 LCD, this common display gives two
Can we control a servo with a rotary encoder? Can we make it turn in the same direction as we turn the rotary encoder? What could we attach to the servo arm? Perhaps use this
A rotary encoder, such as the common KY-040 above, is a knob that you can turn continuously either clockwise or anti-clockwise and detect which direction it is being turned. Types such as the KY-040 are