Pull-up resistors are very common when using microcontrollers (MCUs) or any digital logic device. This tutorial will explain when and where to use pull-up resistors, then we will do a simple calculation to show why pull-ups are important. Suggested Reading Concepts that you should be familiar with before proceeding: What is a circuit? Resistors Voltage, […]
Pull-up Resistors explained Read More »
Experimenting with an HF oscillator, I needed to control the varactor diode voltage in precise increments over a 2V-10V range. A buffered potentiometer was the obvious choice, and connecting two pots in series to give coarse/fine control (or using a multiturn pot) would offer improved control over the varactor voltage. However, this approach still didn’t
Control accurate incremental voltage steps with a rotary encoder Read More »
Badges are amazing things. Better when you make your own. I was about to attend the 1st MakerFest at NID, Ahmedabad and thought of taking something unique to the event. Badge was a great option and suited the maker theme of the event. So, sitting down with a pen and paper i drew what it
Open Badge: The LED Badge Read More »
Overview This project was done for a Friend Of a Friend. He needs to monitor water flow rate and quantity for his solar heating projects. He is mainly interested in this two inch sensor but also sent along a small plastic hose bib type similar to the Adafruit 828. Both of these sensors are turbine
Arduino Display for Liquid Flow Sensors Read More »
photo This is a 18 PIN (16F628A) microcontroller development board Description This project is a versatile, configurable, and cost effective development board available for the 16F628A or other 18 PIN Microcontroller from Microchip. The board has simplest form with all the Port pins terminating in a Relimate connector (Header Connector) for easy connection to the
Multipurpose 18 PIN (16F628A) Microcontroller development board Read More »
LAPIS Semiconductor, a ROHM Group Company, has recently announced the development of a low power microcontroller that integrates an 8bit low power MCU core, speech synthesis circuit, high efficiency Class D speaker amp, non-volatile memory, and oscillator circuit on a single chip, making audio playback possible by simply connecting to a speaker. The ML610Q304 also
Since you lacked the USB interface in your own Arduino board, it becomes necessary to use a homemade/ready-made USB to Serial Converter Module as an efficient and economical solution. Inexpensive and easy-to-use USB to Serial Converter modules are now widely available, such as one shown here. With the help of this little module you can
Bootload an ATmega Microcontroller & Build Your Own Arduino – 2 Read More »
I have a device which provides a USB port. If I attach it to a Windows PC it is recognized as a “CP2103 USB to UART Bridge Controller”. According to the device documentation, it should communicate in serial format at 38400bps.I have to talk to this device with a atmega microcontroller. Since the USB pinout
Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller Read More »
These days I was thinking about a better PIC programmer that can work with Microchip MPLAB IDE software so that I can write my own programs or edit someone else’s programs. I found that there are numerous versions of the famous Microchip PICkit 2 on the web. Some of them are using the original schematic
ORIGINAL PICKIT-2 MICROCONTROLLER PROGRAMMER Read More »
An h-bridge is a chip that allows DC motors to be run versatile, with bidirectional capability. With an H-bridge, motors can go forward or backward, left or right, up or down, etc, depending on the use of the motor(s) in the circuit. Without a microcontroller, the only way to be able to control an H-bridge
How to Build an H-bridge Circuit with an Arduino Microcontroller Read More »
