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Starting whit LCD
Hello,   i have been working whit AVRs and SAM xplained boards for some time now and implemented them in many designs(dataloggers, smart controls, industrial controlers,...
Wednesday, 14 March 2018 - 12:44
LM317 in CC at Vin 5V
Hello,   i often used LM317 as CC generator. Now i have application where i have supply voltage of 5V, the Iout has to be 100mA to power a photo element, and at 100mA the...
Thursday, 4 January 2018 - 10:42
TMP275 equation
Hello,   i am reading TMP275 sensor via I2C and sending it via uart to PC via RS232. Currently i am getting values, which are changing when i heat up or cooldown the sensor...
Wednesday, 13 December 2017 - 10:22
Can i even sense the pulse duration whit Input Cpature?
Hello,   i maded program that senses the duration beetwen 2 rising or falling edges of a pulse on Atmega328. I also have an distance sensor that outputs distance in a form of...
Wednesday, 22 November 2017 - 13:41
Using 2 timers whit 2 prescalers
Hello,   i am assembling program that will read duration of PWM positive pulse in micro seconds(us).  I am using Timer1 in Input Capture mode, which is working as it...
Wednesday, 22 November 2017 - 11:33
LM321MF heating up at 24V
Hello,   i made a RC debounce filter using LM321MF (Edited JS)  as buffer for output. At 12V the circuit works PERFECT, but at 24V, the OP amp gets kinda hot (50 to...
Tuesday, 7 November 2017 - 12:09
Close proximiy sensor
Hello,   currently i am planning a PCB that would detect objects at near proximity. The distance from sensor to object is 10mm to 20mm. Also the objects are 20mm wide and 5mm...
Sunday, 5 November 2017 - 08:42
Shunt resistor w/o amp, use of Vref
Hello,   i am planning a circuit and was wondering if i could use shunt resistor to measure current consumption whithout amp and jsut use MCUs Vref input as is shown in the...
Monday, 25 September 2017 - 14:01
Detecting smartphone proximity
Hello,   i am developing application in which i have to detect if smarphone is inserted into narrow(1cm/0.4inch) slot. So far i was using a switch whit long lever, that was...
Wednesday, 13 September 2017 - 12:50
Two bipolar NPN transistors in pair
Hello,   can someone please explain this circuit to me? I searched over the web and can`t find infos. Found lots of examples of NPN+PNP connected in pair, but never saw this...
Tuesday, 12 September 2017 - 09:02
Controlling half amplitude of 230AC
Hello,   i have to turn on/off half pulse of 230V, at 20mA load (a bistable solenoid valve for coolant). When i turn the load on, it is for max 20ms. So thats a normal AC...
Friday, 8 September 2017 - 12:54
Using interrupt timer diasbles my uart
Hello,i have an application where i send some data to uart every "n" seconds. But i also wish to enable me to request data from the application by writing 0x71 to UART. The...
Thursday, 7 September 2017 - 13:27

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