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BJT switch speed-up capacitor + base resistor calculation?
I'm trying to drive a small DC motor using PWM from of the AVR pins. Right now I have the following setup:   The PWM freq. is around 20KHz at the moment but I'll try to go...
Tuesday, 6 October 2015 - 10:00
Data Visualizer to display UART data when UART is software implemented.
I have some code running on a TINY AVR, I've written a simple Tx library and I used it for debugging - it's all software implemented with a timer. Is there anyway I could display...
Sunday, 4 October 2015 - 22:02
A bit puzzled about external RAM chips - which one to use?!
I know some AVRs come with interfaces for 64kb of additional RAM, however I don't see a problem using around 16 IOs for interfacing in a "dirty" way to an external RAM. I need...
Friday, 2 October 2015 - 17:59
A way to find all AVRs with PLL that enable high-speed PWM?
Seems like you can't search for this parameter on Atmel's website, anyone knows how can I possible gather a list without going over all the available devices?
Thursday, 1 October 2015 - 07:37
PID control over motor PWM
I had a previous post where I tried to drive a small motor with PWM. That did not go so well and I went out and ordered some P channel MOSFETS that will allow me to control the...
Thursday, 28 May 2015 - 10:53
PWM DC Motor driving problems
I have a small DC motor which I'm trying to drive in a single direction using half of an H bridge. I don't have FETs so I used 2N5088 transistors instead. I've measured L & R...
Friday, 1 May 2015 - 19:46
LCD menu generation?
What is the usual way someone would generate menus / screens for a project using a graphics LCD?
Wednesday, 25 March 2015 - 11:11
Max input freq. for external timer clocking in Atmega168?
Can I use a 22MHz signal to clock timer2 in an Atmega168? I can divide that using the internal pre-scaler but don't know if it can handle the speed. Anyone has info on this?
Friday, 27 February 2015 - 11:36
High impedance buffer for disconnecting I2C from analog lines?
I have 3 terminals on a system that are connected to a potentiometer T1 goes to one end of the pot., T2 goes to the wiper, T3 goes to the other end. The potentiometer is 250k. In...
Sunday, 22 February 2015 - 11:48
Using a multiplying DAC as current sink?
I have a current biased oscillator, it is biased in the range of 0 to about 5mA. I need to be able to control that current in a way that is repeatable, no need to be able to set...
Thursday, 19 February 2015 - 13:47
AM modulation depth using an analog multiplier?
Let's assume there is an analog multiplier with the following transfer function: W = Vinput * Vmod + Vos - Vinput is the input signal which is "high freq" (10's of k) - Vmod is...
Tuesday, 3 February 2015 - 08:41
Freq. measurement using a timer + external interrupt not really working
I have a counter connected to an input on an Atmega168. My plan is to setup timer0 to 1ms period, on each odd ISR call the pin change interrupt on the clock pin is enabled, on...
Wednesday, 28 January 2015 - 16:04