Archive for the ‘AVR’ Category

0.000011574Hz: The ATtiny85 super-slow-clock Saturday detector

Tuesday, March 13th, 2018

Igendel writes, "What is the lowest possible clock frequency at which a microcontroller can still do useful work? Here’s a little project that attempts to explore this weird question." See the full post on his blog here, It's Every Bit For Itself. Check out the video after the break. (more…)

Posted in AVR | 3 Comments »

Ultrasonic audio transmitter and receiver system

Saturday, March 10th, 2018

An ultrasonic audio transmitter receiver system from Vinod S. Hi all, this is another mad project.  Aim of the project is to transmit laptop audio via ultrasound to few meters and then receive it and demodulate it and playback the audio on a speaker. See the full post on his blog....

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Posted in AVR | No Comments »

PS2-TTLserial adapter for RC2014 and MIDI

Monday, October 30th, 2017

Dr. Scott M. Baker published a new build: The original reason for this project is that I wanted to build a standalone RC2014 with keyboard and display. There is an official RC2014 serial keyboard, but I find it a little inconvenient for my big fingers and poor eyesight. I have...

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Posted in AVR, hacks | No Comments »

Microcontroller action potential generator

Monday, August 21st, 2017

Scott Harden writes: Here I demonstrate how to use a single microcontroller pin to generate action-potential-like waveforms. The output is similar my fully analog action potential generator circuit, but the waveform here is created in an entirely different way. A microcontroller is at the core of this project and determines...

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Posted in AVR, how-to | 1 Comment »

TTL triggered stimulus generator

Thursday, August 3rd, 2017

Scott Harden has a nice build log on his TTL triggered stimulus generator project: I was presented with a need to rapidly develop a pulse generator to take a TTL input and output a programmable output (for now 0.1 ms pulses at 20 Hz for as long as the input...

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Posted in AVR, how-to | No Comments »

SmallyMouse2 – Universal USB to quadrature mouse adapter

Tuesday, June 6th, 2017

Designed and built by Simon Inns, a universal USB to quadrature mouse adapter project - SmallyMouse2: SmallyMouse2 is a universal USB to quadrature mouse adapter for many 8-bit and 16-bit retro computers and allows the use of modern USB mice on machines such as the Acorn BBC Micro, Acorn Master, Acorn...

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Posted in AVR, USB | No Comments »

Electronic film clapper

Friday, June 2nd, 2017

Steve Smith from ProjectAVR has published a new build: On the board, I included several options to tailor the design to the builders taste. Provision for both a digispark board or bare ATTiny85 chip, small or large tact switches and a jumper to defeat the LEDs supply resistor for extra...

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Posted in AVR | No Comments »

LED traffic light

Wednesday, January 18th, 2017

Domen Ipavec shared his DIY LED traffic light in the project log forum: Traffic lights are all around us, and they seem simple enough but are they really? Real traffic lights can be a very complicated system because it requires sophisticated control and coordination for smooth and safe traffic. The...

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Posted in AVR, project logs | No Comments »

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 »

An AVR Atmega library for multiple HD44780 based LCD connected through i2c

Thursday, August 4th, 2016

Davide Gironi has posted an I2C multiple HD44780 AVR Atmega library: This library implements a driver for HD44780 lcd connected through PCF8574 port expander. Data is transmitted using only 2 wire over i2c with the PCF8574. This library can drive up to 8 LCD concurrently. Lcd driver is based upon...

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Posted in AVR, library | No Comments »

Atmel Retrokit SAM D Edition

Saturday, July 16th, 2016

Dan Watson has published a new build, the Retrokit SAM D Edition board: I created a 2016 re-design of the Retrokit that uses the Atmel SAM D09 microcontroller. This is an excellent 32-bit device that comes in a SOIC package, making it easy to solder. I mimicked the board size...

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ATtiny based bidirectional motor control using L293D

Friday, July 1st, 2016

Rahul over at Xanthium has posted a tutorial on interfacing ATtiny with L293D: In this tutorial we will learn to interface L293D with ATMEL ATtiny microcontroller and control them bidirectionally.The microcontroller used here is ATtiny2313A which is interfaced to two L293D motor control chips for controlling upto 4 DC brushed...

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Posted in AVR, how-to | No Comments »

Touchpad as wireless (MIDI) expression controller

Friday, May 27th, 2016

Acidbourbon has published a new build, a wireless touchpad that can be used like an expression pedal: This sort of touchpad speaks some special Apple mouse protocol. Luckily I found a code snippet on which helped a great deal to get the thing going. Then I used a standard...

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Posted in AVR | No Comments »

ATtiny10 Mini Breakout Board

Monday, February 29th, 2016

Dan Watson has designed this very tiny breakout board for the Atmel ATtiny10. He wrote a post on his blog detailing its assembly: This breakout board is for the ATtiny10 microcontroller. The PCB is 0.25x0.325" and uses 0.050" header pins. The board could actually be made smaller, but I ran...

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Posted in AVR | No Comments »

Instruments for the GSXR

Wednesday, February 24th, 2016

Josh from imsolidstate made a new dash panel for his streetfighter based on an ATmega128, a Planar EL 160x80 display, and an Epson S1D13700 controller: Since the GSXR is now a street fighter the factory gauges won’t do, and I wanted something I could log air/fuel ratios with so I...

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Posted in AVR, DIY | 2 Comments »

AC energy metering board using an Atmel 90E24 energy metering chip

Monday, September 21st, 2015

Steve Rodgers writes, "Here's my latest project.  Its an AC energy metering board using an Atmel 90E24 energy metering chip. The board can either take an ESP8266-12 and run a native C application, or the ESP8266-12 can be omitted, and an external microcontroller can be used to talk to the...

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Posted in AVR | No Comments »

AMQUMO: A Xively AMbient QUality MOnitor built on ATmega328

Thursday, August 6th, 2015

Davide Gironi published a new build, AMQUMO -an ATmega328 AMbient QUality MOnitor: AMQUMO logs 4 environmental parameters: -Humidity -Temperature -Ambient Noise -Brightness The data it is logged to the platform, and displayed to the user through 4 bi-color leds. It can be used to monitor you Office Ambient Quality over...

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Posted in AVR | 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 »

Make an ATTiny85 programmer and development board

Wednesday, April 22nd, 2015

  Larry blogged about his DIY AVR ATTiny85  programmer and development board: Starting from upper left is the 6-pin AVR programming header. I chose it because it has +5 and GND as well as the programming signals and can power the board. Next a red LED to show power to the board....

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Posted in AVR, DIY | 1 Comment »

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Recent Comments

  • Drone: The LM7171 used in this very simple design can be simulated in LTspice with reasonable results at 10MHz using the non-encrypted PSPICE model from TI...
  • Jon Jackson: I would be interested in 1 or 2 of your circuit boards. Jon
  • Max: An actual Saturday "detector" built with the same hardware would use the precisely timed slightly varying length of the day (and some built-in astronomy data)...
  • KH: In the old days, these things remained on paper forever as whimsical scrawls. Today, they are brandished about on blogs for the entire world to...
  • KH: So he doesn't really know what he's doing. Yawn. It's sensor-controlled. It's not an oscillator. A leaf covers the window, you're toast. TLV3702? Overkill. The...