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digital transmission over long cables
I'm trying to drive 10x 75HC595 in serie over a distance of 20meters. I'm using flat cables with 10 conductors. All goes well for 3-4 units with less than 10meters, but as you...
Monday, 27 May 2013 - 12:14
Constant current problem on discreet regulator
As part of a larger project, I have a MAX1701 switching booster in which I want to use a spare opamp to provide a regulated charge to a lipo. I want the output to be 4.2V and...
Saturday, 9 April 2011 - 06:34
Choices for low cost CCD interface - AVR, ARM, FPGA, ...
This might not be the best place to post this, but you're insights have always been so helpfull here it is worth a try ;-) I want to start a research project requiring a low cost...
Thursday, 4 November 2010 - 09:23
Camera flash led array control
I thought about splitting this into many threads, but it might be better to describe the application in full. So sorry if it is a bit long. At this stage, I don't know where to...
Monday, 2 March 2009 - 12:10
Synchronous UART with mixed clocks
I'm using an ATMega324 and want to run it at 20MHz, while maintaining fast and reliable serial comm at 115200 bauds. I've seen megas can use an external clock XCKn for the UART...
Thursday, 16 October 2008 - 08:10
Phototransistor sensitivity and frequency meter
I'm trying build a frequency meter to measure the frequency of displays. So I need to measure frequencies up to 120Hz, no more. I tried using a phototransistor ( http://www....
Thursday, 15 November 2007 - 22:56
Battery charger constant current value ?
I have made a basic battery charger with a LM317. What is the best constant current value I should use ? (using NiMh) Also if I charge the batteries in serie, should I multiply...
Tuesday, 4 September 2007 - 17:13
Avr connected to mains with a resistor ? any comments ?
I found this some time ago... http://ww1.microchip.com/downloa... Do you think it is doable with an atmel mcu ? What do you think of that design ? Is it really safe ?
Friday, 17 August 2007 - 06:43
Someone with ST Lcd Controllers/drivers experience ?
I bought a Barton LCD controller by a STE2004S used in I2C mode. (extended instruction set) I just can't get the thing to display a thing. Voltage is ok, fuses and such ok, I2C...
Monday, 13 August 2007 - 08:23
Joining multiple voltage regulators or PWM ?
Again, I need your ideas and experience ;-) I want use a peltier to cool down a ccd, controlled by a mcu with a temperature sensor. It is rated 6A and 15.4V... Well now I need a...
Wednesday, 25 July 2007 - 17:08
One button power on, and auto power off.
I'm looking for a design that would do this : -System is off. -Press power button -System powers on, and stays on after button release. -At mcu demand, system is powered off. I...
Saturday, 7 July 2007 - 20:35
Forcing 16 or 32 bits global variable to use register in gcc
I've been using registers for global variable for many projects. Instead of using : volatile uint8_t timer; I use register uint8_t timer asm("r3"); That has the benefits of...
Saturday, 16 June 2007 - 08:36