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1  Using Arduino / Sensors / Re: Atmega328p internal temperature sensor on: November 24, 2012, 11:59:38 am
With 2 leds and an E-paper display, constantly turned on and updating, I get 112-113. So it does respond a little to internal heat, but hardly at all to external temperature changes.

Okay, if this is how it is supposed to work, it is not useful at all. Unless you want to do some dynamic overclocking thing or something.
2  Using Arduino / Sensors / Re: Atmega328p internal temperature sensor on: November 24, 2012, 10:26:13 am
I'd be happy with that, but it doesn't change. It keeps at 97 if I attach the battery and walk from room temperature to a fair number of degrees colder outside temperature and stand there for a minute.
3  Using Arduino / Sensors / Atmega328p internal temperature sensor on: November 24, 2012, 10:20:15 am
I came across a few sources that claim the atmega has a not-so-accurate temperature sensor.

http://www.netquote.it/nqmain/2011/04/arduino-nano-v3-internal-temperature-sensor/
http://arduino.cc/forum/index.php/topic,38043.0.html

I tried both of these approaches, but both give me 110-112 no matter if I go stand outside or put my finger on the package. Room temperature is around 18C while outside is more like 6C.

The only consistent difference I get is changing between the 3.3v serial cable and 3.6v battery pack. The latter gives readings of 97-99.
4  Using Arduino / Project Guidance / Re: large e-paper display - waveform / SPI / EPSON uC on: October 02, 2012, 09:59:28 am
I told them I wanted to buy 10.000. One reason I have no price yet is that they wanted to know if I want them with or without TCON boards. They could have given me the price for both but no...

Okay, so waveform is out of the window. SPI is too limited. That leaves the EPSON chip.

Or is there a DIP chip that could do waveforms?

It is nearly impossible to hand-solder BGA chips, I've been told. So that would complicate development a lot. I guess that brings me to (multi layer)PCB design, simulation and manufacturing?

I'm not hacking I'm.. ahem, developing a product for a niche market smiley

P.S. I tried the kindleberry, but there is no terminal emulator for my K4NT.
5  Using Arduino / Project Guidance / Re: Solar powered Arduino and Android: Possible? on: October 02, 2012, 06:19:31 am
Another servo fact: They create a lot of noise, which is why they should be powered directly, always. They can cause trouble in other parts of your circuit if you power them via the Arduino.
6  Using Arduino / Project Guidance / large e-paper display - waveform / SPI / EPSON uC on: October 02, 2012, 06:09:39 am
Like many people on this forum, I'm interested in connecting a e-paper display to an Arduino.

But then I'd like something larger than the Sparkfun thing. I want to make a paper terminal for my PC, so I can stare at VIM on a piece of e-paper instead of a big lamp.

I've been talking to MSC - the distributor of Pervasive Displays for Europe - about their displays, and there seem to be 3 methods of control.

  • SPI via a TCON board
  • An EPSON chip in a BGA package
  • Directly via waveforms

I think SPI would be the easiest, but then you can only refresh the complete screen with 1 bit B&W. When typing on my terminal, I don't want to wait for the whole screen to refresh every time I press a key.

The EPSON chip allows you to do partial refreshes with grayscale, but I'm not sure how hard it would be to integrate that chip.

I have no idea what it even means to do waveforms, and if that is possible with the Arduino. The spec for 1 bit is free, the spec for grayscale waveforms is 5500USD.

They also ignored my requests for a price.

Advice needed smiley

If this is even remotely feasible, I would buy a prototype screen, and later a batch to resell to other enthusiasts.

I am a programmer, not an electrical engineer. I did make this PICAXE controller before: http://studl.es/2012/05/diy-servo-controller/
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