Feb 05 2018
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
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
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
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
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 …
Sep 02 2017
I built another handy circuit to ‘house’ a 4 character 7 segment display. It looks like this: Basically it just ‘breaks out’ the 16 pins of the display with two 8 pin female headers. Pins 1-8 are connected to the header at the bottom and pins 9-16 are connected to the header at the top. …
Jul 03 2017
If you have been reading my posts lately, you will notice that I have been working a lot with the ESP8266 wireless module. To make it easier to work with, I made an ESP8266 DIY Programmer Cradle. Here is what it looks like (without and with the ESP8266 plugged in): …
Jun 30 2017
I created an app (apk) to run MicroPython WebREPL on Android. Imagine you have your ESP8266 (with the MicroPython firmware) in some location where the only access to it is via a wireless connection. If you need to access and change/control it, you will need WebREPL. Of course, a wireless enabled laptop would get access …
Jun 28 2017
To enhance the capabilities of the ESP8266 there are various firmware packages available. In my last post, I showed how to install NodeMcu which uses eLua. I am a big fan of the Python programming language, so I was very happy to see a Python version for the ESP8266. The ESP8266 MicroPython Firmware is available …
Jun 23 2017
If you would like to go beyond the basic features in the ‘default’ ESP8266 firmware, it is possible (and relatively easy) to create your own ESP8266 custom firmware. With ESP8266 custom firmware, your possibilities for interaction with connected devices are almost endless. The reason why is that you can now connect pins on the ESP8266 …
Recent Comments