If you’ve poked around the internets where electronics hobbyists collect, it is likely that you are acutely aware of our incontrovertible affinity for building timekeeping clocks. It is similarly unlikely that you have been able to evade the plenitude of nixie tube based projects. There is a reason for this. Nixie tubes are cool. They […]
The part choice sets the power supply The ATmega128 is a 5 V part unless you deliberately buy the low-voltage variant: the ATmega128 is specified for 4.5–5.5 V at 0–16 MHz, the ATmega128L for 2.7–5.5 V but only to 8 MHz. Decoupling decides whether the ADC is usable. AVR042 asks for one capacitor per VCC/GND
DIY AVR Development Board with Atmega128 Read More »
What “standalone” removes from the loop A standalone AVR programmer needs no host when it runs: the image sits on an SD card or local EEPROM, a button starts the transfer, two LEDs report the result. Everything between opening a terminal and typing avrdude becomes a state machine in a microcontroller. That decides who can
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This library is an update of the software PWM driver you can find here: http://davidegironi.blogspot.it/2013/03/controlling-dc-motor-speed-and_6.html For DC motor information please look at the above link. This update implements also progressive start / stop features using hardware timer. The PWM frequency have to be selected in the way that the switch frequency is much higher than the dynamics
Driving a DC motor using PWM with AVR ATmega Read More »
A device-scoped look at the ATxmega32A4U’s single two-channel 12-bit DAC: its PB2 and PB3 outputs, the ideal code-to-voltage relationship, and the reference, calibration, and load conditions that determine real output.
ATxmega32A4U DACB: Two 12-Bit Channels, Output Pins, and Calibration Conditions Read More »
The two ways to build a USB DAC Every DIY USB DAC answers one question first: where does the USB audio interface live? Single-chip. A part like the PCM2704 or PCM2706 contains the USB interface, the audio class implementation and a DAC in one package. It needs no firmware, no driver and no microcontroller. You
Introduction Digi-Lev “On the level with digital accuracy.” The Digi-Lev digital level is a culminating design project for the ECE 476 Microcontrollers course taught by Prof. Bruce Land at the Cornell University department of Electrical and Computer Engineering. Two inventive and industrious students set out to build a position tracking device and one month later
I had a bunch of random inductors in some random drawers and I wanted to know what values they were. These values are quite often not obvious by looking at the device. Colour codes for old ones were not standardized and some of the coloured rings on inductors can be faded or discoloured so that
Inductance/Capacitance Meter Saga Read More »
We tried all kinds of ways to get the Arduino IDE to compile and program our ATMega128 chips that we’d so carefully soldered onto our breakout boards. Steve spent longer than could be reasonably expected, hammering away, determined to make progress. In fact, he got so far as to get Arduino 022 to compile some
Programming an ATMega128 Read More »
fun with ATMega328 and rtl-sdr Yesterday came to my attention a project that turns the Raspberry Pi into a FM transmitter. It is totally awesome and you should check it out. While reading an article about it, I thought to check ATMega328 and its fast PWM mode I showed you in the previous article for electromagnetic
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