Jan 13 2021
How good are you at soldering? Here is the STM32F103C8T6 microcontroller board that I use and have to solder all of the pins. Sometimes when I solder pins to the board, the connection looks OK and even tests OK with continuity on a multimeter. However, the solder connections even though they pass those two …
Dec 30 2020
A 5 way navigation button actually has 7 different navigational settings. It has a lot of functionality in a small package. The ‘button’ on it can be moved/pushed in 4 directions ( labeled up, down, left, right) or pressed down. There are also two other switched buttons labeled ‘Set’ and ‘Reset’ for a total of …
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 …
May 13 2016
Someone asked me the other day if it was possible to have a ‘chat’ between Arduinos using the I2C Wire library. I came up with ‘proof of concept’ code called ‘I2C Wire Chat Between Two Arduinos’. Here is the sketch: I2C Wire Chat Between Two Arduinos /* I2C wire chat From: earl@microcontrollerelectronics.com Analog Pin 5 …
Aug 31 2015
A while back I wrote about the BusPirate. You can view that post here. In it, I mention an Arduino sketch called the “MiniPirate” which allows you to try some of the functions of the BusPirate on an Arduino. Over time, I have found that sketch to be very useful. You can use it to …
Jul 06 2015
I just found out that my favorite Arduino of choice (the Leonardo) has a problem with SPI “Serial Peripheral Interface” communications (if you need to use the SS pin). For SPI (which is bidirectional) , the following pins are normally used: SS – Slave Select – digital 10. You can use other digital pins, but …
Aug 09 2014
If you’d like to wirelessly attach your Arduino to another device (such as a phone or tablet) via bluetooth, I’d recommend the serial bluetooth module from Elecrow.com. Here is what they look like: The module has firmware from BOLUTEK. The PDF document with all of the available BOLUTEK commands is BLK-MD-BC04-B_AT COMMANDS . I …
Aug 07 2014
I picked up a couple of these modules: from Elecrow.com so I could attach (communicate with and control) several of my Arduinos through a LAN connection. The main chip is the ENC28J60 from microchip.com. These modules are better than an Ethernet Shield in that you can easily attach these to any Arduino and they …
Aug 04 2014
Many years ago (I am old ;-)) I was asked which microcontrollers are best, ones from PIC (microchip.com) or ones from Atmel (atmel.com). At the time I was asked, there was a lot of discussion about chip architecture, instruction sets and which chip was best. I thought at the time and still feel this way, …
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