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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
Using DAC08 (multiplying DAC) for amplitude modulation + depth control?
I've managed to feed a signal into the reference input of a DAC08 and apply amplitude modulation at a freq. of my choice. I would like to add depth control that will go from 1% to...
Friday, 2 January 2015 - 22:23
ISR won't get called when not placed in the main C file?
I have a project with several headers and C files. The ISR code for timer1 compare match is placed in one of the files, there is no mentioning of the ISR in the header file...
Thursday, 1 January 2015 - 11:43
Tap tempo (measuring time between button presses)
I used to have a code for this, but was not happy with how it performed. This is something I came up with a short while ago, I know some variables and calculations can be removed...
Thursday, 18 December 2014 - 12:09
Measuring up 25MHz with an ATtiny?
I need a very small (physically) and affordable (read: cheap) solution to measure a clock signal up to about 25MHz. The accuracy which I need is as good as possible using simple...
Wednesday, 17 December 2014 - 11:54
Why this function returns a strange float number?
I have a variable uint16_t A and a macro #define B 2.5F And a function: float calc_cycles() { return A * B; }Which returns a huge number which is not the result of A*B. How...
Thursday, 11 December 2014 - 17:43

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