Driving Any Stepper Motor for Less Than $1 with The L293

Electronics, ArduinoJoshua HriskoFebruary 7, 2018Motor, Arduino, Stepper, Bi-polar, electromagnetic, L293D, Driver, Open-Source Comments

Arduino - Randomly Blinking Multiple LEDs With Only 9 Lines of Code

ArduinoJoshua HriskoFebruary 2, 2018 Comments

Multi-Touch Sensor and Arduino

Electronics, Programming, ArduinoJoshua HriskoJanuary 20, 2018Capacitive Touch Arduino, Capacitive Touch Sensor, Capacitive Touch Tutorial, LED, LEDs, Arduino LED, Sensor, Touch Sensor, Multi-Touch, Multimeter, Arduino, Arduino IDE, Arduino Uno, RGB Comments

Infrared Obstacle Detector for Less Than $1

Programming, ArduinoJoshua HriskoJanuary 17, 2018Comment

Using Raspberry Pi, HM-10, and Bluepy To Develop An iBeacon Mesh Network (Part 2)

Using Raspberry Pi, HM-10, and Bluepy To Develop An iBeacon Mesh Network (Part 1)

Bluetooth Home Automation Light Bulb Switch Using An HC-05, A Relay, and Arduino

Bluetooth, Electronics, Programming, Arduino, Editor's PicksJoshua HriskoNovember 15, 2017 Comments

Introduction To Capacitive MEMS Accelerometers and A Case Study On An Elevator

Arduino - Sending A String Over Bluetooth Using The HM-10

As an introduction to Bluetooth with Arduino or Raspberry Pi, I recommend using a component called the HM-10 [datasheet here]. The HM-10 is a Bluetooth low energy module that employ Bluetooth 4.0, which is currently the most widely used protocol for wireless devices (along with Wifi, but I will discuss this later). All of the current iPhones, Androids, and Google phones use Bluetooth 4.0, and it will likely be around for quite a while. The module is powered at 3.3V and consumes around 50mA (peak), 8.5mA (nominal), and can sleep with a current between 400uA - 1.5mA. It claims to have an open-space transmission range of 100m, and boasts transfer rates at 2 kilobytes per second. The underlying chip is a Texas Instruments CC-2540/2541 [see here]. The HM-10 is particularly germane because it cooperates nicely with the Arduino software with a mere four lines of code in the IDE.