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