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Aug 28 2018
The Arduino Command Line Interface (CLI)
The Arduino folks just came out with the Arduino Command Line Interface (CLI) : Announcing the Arduino Command Line Interface (CLI) A while back, I wrote about the Arduino-Builder which is what the Arduino IDE invokes behind the scenes to compile the sketch. (That post is here.) Now, with the Arduino Command Line Interface, everything …
Apr 16 2018
STM32F103C8T6 DIY Programming Cradle
I recently created an STM32F103C8T6 DIY programming cradle. Here is what it looks like: It comes in handy when you need to program a bunch of STM32F103C8T6s. (Note: I made a similar ‘cradle’ for programming bunches of ESP8266s’. Read about that here.) A standard USB to serial converter is attached to the 6 pin header …
Mar 16 2018
Push a Button and Play a Video
To motivate and engage sales people, have a big red button to push when a sale is made. They push a button and play a video. Something fun! Add flashing lights for extra effect! Here are two different means to accomplish this. One solution involves an Arduino UNO serially attached to a PC running the Windows OS. …
Feb 27 2018
Pulse Width Modulation
MicroControllers are digital devices and usually do not have built in digital to analog converters (or DACs) to output an analog signal. Some, however, do have analog input. For digital output, the voltage is one of two values. Output voltage is either 0 volts or near equal to the voltage source (‘off’ or ‘on’). Using a technique …
Feb 15 2018
PIC Timer0 Code Generator and Calculator
I needed an easy way to calculate Microchip PIC timer 0 values, so I created the PIC Timer0 Code Generator and Calculator. If you are not familiar with PIC timers, there is a handy tutorial HERE. The calculator part, is a spreadsheet which calculates the timings and timer 0 frequency counter needed, given the required …
Feb 05 2018
Controlling Things Based on Light Intensity
A PhotoCell or LDR (Light Dependent Resistor), used in a circuit, allows controlling things based on light intensity. Here is a circuit showing how to wire an LDR and demonstrates how controlling things based on light intensity is possible with a little help from a microcontroller. The thing being controlled in this circuit is simply an …
Jan 27 2018
How to keep an ENC28J60 Module from Freezing
The ENC28J60 module is good for attaching an Arduino to a LAN or the Internet. The one real problem in doing so is how to keep an ENC28J60 module from freezing. No, not temperature wise ! 🙄 (‘Freezing’ in the sense of locking up, stop working, etc.) There are many Ethernet arduino libraries for the …
Jan 25 2018
Switching 12V from a 5V Arduino
I built a circuit to allow switching 12V from a 5V Arduino. Here is the wiring diagram and a picture of the actual circuit: Get the Fritzing source HERE. The side with two connections attaches to the 12V device being switched ON/OFF. The side with three connectors, connects to the 12V …
Jan 21 2018
Decoding an ESP8266 Firmware Image
I recently coded a Python script for Decoding an ESP8266 Firmware Image. It’s the first part of my quest to create a Linux tool for creating a single flash image. More specifically, the script will decode a single binary image or a ‘combined’ image. A combined image (single flash image) can be created with the …
Oct 22 2017
12V to 5V Sensor Circuit
A number of sensors are powered via 12 Volts. Some, however, need 5 Volts. To power a remote DHT11 temperature sensor, I created a 12V to 5V sensor circuit. This is the wiring diagram: Get the Fritzing code for it HERE. The DHT11 needs 5 volts, ground and data. It plugs into …
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