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An USBasp in a new design

Just a small teaser: today I received my circuit boards from PCBgogo – a layout which I just had sent to the Chinese manufacturer last Sunday.

The finished circuit board from China.

It is a USBasp, which can be placed on a breadboard and at the same time supplies the power rails […]

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A portable electronics bench

A couple of years ago I mounted an Atmel STK500, a couple of breadboards and a power supply in a briefcase. This allowed me to bring test circuits to my lectures and demonstrate them in the class room.

The briefcase with the STK500 still mounted.

Since I now have abandoned the STK500 […]

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ATmega328P – measuring its own supply voltage III

After the first two parts of this series

ATmega328P – measuring its own supply voltage ATmega328P – measuring its own supply voltage II

where I investigated the possibility of the Atmel ATmega series microcontrollers to select the internal bandgap voltage VBG as input for the analog-to-digital converter. Using the analog supply voltage AVcc as […]

Continue reading ATmega328P – measuring its own supply voltage III

ATmega328P – measuring its own supply voltage II

Here is a brief follow up from yesterday’s post on the internal reference voltage VBG of the ATmega328P.

I wrote a small test program where I wait for a variable delay time after switching the input multiplexer of the analog-to-digital converter to the internal bandgap reference voltage VBG. Using the AVcc of as the […]

Continue reading ATmega328P – measuring its own supply voltage II

ATmega328P – measuring its own supply voltage

The trick is not new, it is utilized in the AVR transistor tester which you can buy for quite cheap money from China, and it has been discussed in internet forums for almost 10 years (see below for some links).

The Atmel AVR microcontrollers feature an analog to digital converter (ADC) equipped with […]

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AVR ISP breadboard adapter

My very own AVR ISP adapter on a breadboard.

Breadboards are great! I mean the solderless breadboard type which you can get everywhere now for almost no money. I use them all the time to prototype electronics circuits and have been forcing my students to do the same.

Most of my current […]

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Merry Christmas!

https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/5x7_led_weihnachten.mp4 https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/5x7_led_xmas.mp4 https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/14seg_xmas_500bps1.mp4 https://www.sciencetronics.com/greenphotons/wp-content/uploads/2013/12/14seg_weihnachten_500bps.mp4

Hacking an AVR programmer

(see also my recent appendix to this topic: Hacking an AVR programmer II – especially if you have an ATmega88-based programmer!)

On eBay I recently purchased a set of cute small USB AVR programmers which I intend to use in the course 1TE663 Microcontroller Programming at Uppsala University.

MK-USBISP-V3.00 programmer in an […]

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DIY STK505 replacement

The Atmel STK500 development board does support many but not all of Atmels AVR controllers. As an enhancement a STK505 unit was constructed by Atmel to support the ATtiny24/44/84 series of microcontrollers, which come in a 14-pin DIP package. Other plugin-boards for other pinouts have also been made, but since the STK500 itself is […]

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Do they know what they do?

LED driver

As you can read in my earlier posts I have become quite attached to the AVR microcontrollers from Atmel. We also use these microcontrollers in projects with our students at Uppsala University.

Probably one of the widest spread development tools for AVR controllers is the original STK500 starter kit from Atmel, which in principle […]

Continue reading Do they know what they do?