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Posts Tagged ‘Microcontrollers’

Adding ADC to Microcontrollers without ADC

Thursday, September 15th, 2016

Scott Harden writes: I recently had the need to carefully measure a voltage with a microcontroller which lacks an analog-to-digital converter (ADC), and I hacked together a quick and dirty method to do just this using a comparator, two transistors, and a few passives. The purpose of this project is...

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Posted in AVR | No Comments »

VHF Frequency Counter with PC Interface

Wednesday, September 7th, 2016

Scott has published a new build: This is the general idea behind how this frequency counter works. It’s so simple! It’s entirely digital, and needs very few passive components. sn74lv8154 is configured in 32-bit mode (by chaining together its two 16-bit counters, see the datasheet for details) and acts as...

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Posted in RF | No Comments »

Opto-isolated laser controller build

Thursday, July 28th, 2016

Scott Harden built his own opto-isolated laser controller and wrote a post on his blog detailing its assembly: My goal was to utilize a free hardware output line to signal to a device that I build to modulate the laser in a special way. This way there would be no...

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Controlling Bus Pirate with Python

Thursday, July 14th, 2016

Scott W Harden writes, "After using the AVR-ISP mkII for years (actually the cheap eBay knock-offs) to program ATMEL AVR microcontrollers, today I gave the Bus Pirate a shot. Far more than just a microcontroller programmer, this little board is basically a serial interface to basic microcontroller peripherals." Full details at SWHarden...

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Pressure, temperature and humidity sensor based on MS5637 HDC1080

Thursday, June 16th, 2016

Mare writes: This is another small module to measure air pressure, temperature and humidity. Two sensors are on-board: MS5637 and HDC1080. Microcontroller is small cortex M0 in TSSOP-20 housing from STM: STM32F070CxP. The SN65HVD72DGKR provides RS485 interface functionality with half duplex mode. Voltage regulator, reverse polarity protection and some LED...

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Posted in PCBs | No Comments »

Programmable CW Morse Keyer / beacon

Wednesday, February 17th, 2016

Marko Pavlin has designed a Mini USB dongle with STM32F0xx , he writes: Mini USB dongle with STM32F0xx is suitable many for simple, mini projects. I attached speaker to Timer14 PWM output (Pin PA6) and LED (or optocoupler connected to PTT) to GPIO pin PA0 The provided software is based on USB...

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Posted in DIY, USB | 2 Comments »

Atmega16u2 virtual serial example using LUFA Library

Wednesday, January 6th, 2016

Shane of Wattnotions has published a new build, an Atmega16u2 virtual serial LUFA board: What I wanted the LUFA library to do was pretty specific – the atmega16u2 should show up as a virtual serial port so that the computer can connect and read data from it like any other serial...

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Posted in hacks, library, PCBs | No Comments »

STM32 Nucleo and DFU USB bootloading

Wednesday, July 22nd, 2015

MrMobileWill writes: Over the last few months I have been playing with the Nucleo development boards from STMicroelectronics. If you're unfamiliar with them, they are fast, mbed and Arduino (headers) compatible. This makes it easy like an Arduino to program and use. What sets them apart is that they are...

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Posted in programmers, tools | No Comments »

A GUI and CLI utility for EFM32’s UART bootloader

Friday, July 17th, 2015

Mario writes: I've been doing mostly sensor-based systems and I think these microcontrollers are the perfect fit. ARM Cortex (they go from M0 to M4, and their series seem to keep growing), an architecture that was specially designed for low-power sensor-based embedded systems, allowing to measure "stuff" while the CPU...

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Posted in ARM, AVR | 1 Comment »

XMega analog comparator

Friday, July 10th, 2015

Shawon Shahryiar over at Embedded Lab has written an article on XMega analog comparator: Generally a comparator is a device that compares two quantities. Analog comparators compare voltage – an analog quantity. An analog comparator is essentially an op-amp with infinite gain. It has one output and two inputs. The...

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Posted in AVR | No Comments »

Designing a PIC24 development board

Wednesday, July 8th, 2015

Brian Dorey has designed and built a PIC24 development board, that is available at GitHub: One problem we found was trying to prototype code using this microcontroller as unlike Arduino and any ARM microcontrollers there isn’t a small easy to use prototyping board available for the PIC24 chip.  Microchip make an...

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Posted in PIC | No Comments »

USB interfacing for AVR microcontrollers

Monday, January 19th, 2015

Ralph Doncaster  writes: Since the release of V-USB, dozens of projects have been made that allow an AVR to communicate over USB. USB data signals are supposed to be in the range of 2.8 to 3.6V, so there are two recommended ways to have an AVR output the correct voltage....

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Posted in AVR, USB | No Comments »

iButtonLink T-Sense 1-wire sensor (Maxim DS18B20) + PIC 18F14K22

Tuesday, January 6th, 2015

Chas over at PNW/Electronics writes: I came across a stash of iButton T-sense 1-wire sensors.. so I grabbed a couple and decided to check out 1-wire. Maxim makes a 1-wire device called the DS18B20. It’s a 9-12 bit temperature sensor with the possibility of being powered by parasitic power from...

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Posted in Interface, PIC | No Comments »

DIY binary wrist watch

Wednesday, August 13th, 2014

Elia wrote an article detailing his binary wrist watch project: I have just finished my binary wrist watch project (well, the new revision anyway). I was surprised at how small I was able to make it compared to last time. I chose to go with the “super-yellow” color LEDs as they fit...

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Posted in DIY, PIC | No Comments »

ATXMega Primer

Wednesday, June 25th, 2014

Shawon Shahryiar over at Embedded Lab talks about Atmel XMega in this tutorial: At present we have different families of XMega devices. Of these many we are focused toward the AU series only throughout this post and its following ones. I’ll explain later why I’m interested in this series. This is the first post...

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Posted in programmers, tutorials | No Comments »

DIY external serial monitor

Friday, April 11th, 2014

ARPix  wrote this Instructable detailing the build of his DIY external serial monitor: Sometimes I needed an external serial monitor like the Serial Monitor in the Arduino Editor, to see what is going on. So I made one. The first picture shows an example how could be it designed. For the ESM...

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Posted in Arduino, DIY | 7 Comments »

Power line communication

Thursday, April 10th, 2014

Haris Andrianakis wrote a post on his blog detailing his power line communication system: The main purpose was to implement two devices communicating each other, using the technology of power line. Specifically, at this project the communication has been used to send data from a weight bridge/ weight machine to a remote display. For...

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Posted in AVR, data transfer | 2 Comments »

Thermostat V1.0

Wednesday, March 12th, 2014

Haris writes about his digital Thermostat project: In the need of my new homemade energy saving fireplace (which boils water for the radiator) i designed and built a digital thermostat. The idea to design my own thermostat came when i came across with the following problem. When i first fire the...

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Posted in AVR | 1 Comment »

Si4707 weather radio

Thursday, February 6th, 2014

Charles has been working on a Si4707 weather band radio project: Right now on the bench the PIC powers up, resets and powers up the radio, then tunes the radio via I2C to 162.55MHz. It finishes up by reading back the status and then dumps the Tuned Frequency and RSSI (...

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Posted in PIC | No Comments »

Oscillator controller for 8bit PIC microcontrollers

Monday, January 20th, 2014

Dilshan Jayakody writes: This is oscillator controller for 8bit PIC microcontrollers which is specifically design to debug MCUs and related circuits by without using ICD unit. This unit consists with low speed oscillator and cycle counter with automatic hold. In current version, oscillator is capable to run in 2 frequency...

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Posted in PIC | 1 Comment »

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