Arduino, ESP32/8266, Bluetooth, and stuff
If you have read through the Arduino Serial guides you should now have a good grasp on using serial communication but did you ever stop to ask yourself what actually is serial UART? If you did you are in the right place. UART stands for Universal Asynchronous Receiver-Transmitter which probably doesn’t help explain what it … Read more
I mentioned in the HM-10 introduction that BLE is all about services and characteristics and the HM-10 works by setting the value of a custom characteristic to match the value of the data being transmitted or received. This can be seen when using the BLE Scanner app and an Arduino and the Arduino IDE. This … Read more
HM-10: Add a second Custom Characteristic By default the HM-10 comes with a single custom characteristic under a custom service. A second write only characteristic can be added using the “AT+FFE2” command. “AT+FFE2” was added in firmware 5.45 and extended in version 5.50. The second custom characteristic only has a WRITE property no READ and … Read more
What is a iBeacon You can think of a iBeacon as an electronic light house. It simply sends out timed signal letting people know it is there. When an app on a mobile device constantly finds a signal it can react is a specific way. For example, in a shop a special discount may be … Read more
Have a HM-10 and want a chat with it? You need to know what to say and how to say it. Let’s try talking to a HM-10 with some of the more common AT commands Note: AT commands only work when the HM-10 is not connected to another wireless device. After a connection is made … Read more
Note: Updating the firmware is non-reversable. Once you issue the OK+SBLUP command there is no going back.
There have been a lot of firmware updates since I originally did this post so I thought it was time to have an update. Updating the updating as you will.
It’s been a while since I have done any real in depth tests on new Bluetooth modules. I keep buying them but never find the time to play with them, and fror my own projects I have started to move away from using Bluetooth and into using web apps (ESP82666 and ESP32). For the times … Read more
Arduinos are fairly limited when it comes to connecting things to them. Anything that needs more than 5V (or 3.3V depending on the board) is a no no. And it’s not just voltage you need to worry about. Even if the voltage is OK you still need to care about the amount of current the … Read more
Using short presses and long presses together adds versatility and gives extra function to a single button switch. No longer are you restricted to pressed or not pressed. No. Now you have pressed a bit, pressed for a bit more. This guide follows on from the previous post about timing a button switch press and … Read more
AKA: Time How Long A Push Button Switch Is Closed. Ever wanted to know how long a button switch was pressed for? YES. Read on. A couple of examples that do exactly the same thing, time how long a button switch was closed/pressed, but in slightly different ways. Circuit Both examples below use the same, … Read more