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ADS1220 internal temperature sensor
Hello, I'm trying to read internal temperature sensor data of ADS1220. But I don't understand result: under normal conditions (temp ~25 deg C) device reads 0x000FD1B6 If I...
Wednesday, 12 July 2017 - 11:37
Microcontroller with high output current to drive LEDs
I want to build display device with 8-char 16-segment display.  OK, I can connect common cathodes (or anodes) with FETs, but is it OK to sink or source power to LEDs...
Thursday, 2 February 2017 - 07:35
Measuring leakage current in 3-phase system with current transformer
Hi, I want to measure a precise number of leakage current in the 3-phase trace heating system. The problem I faced is that typical current transformer gives a very high error at...
Thursday, 1 December 2016 - 14:23
SOLVED: Atmega8 SPI slave - bit error
I'm getting 1-bit shift when I receiveing or sending data through SPI. When receiving, 1 bit is shifted right, so, for example, 2F becomes 17. When sending, 1 bit is shifted left...
Thursday, 13 August 2015 - 06:44
Need help to diagnose BOOST converter
I'm building a converter to boost voltage from single li-ion cell to power 12V motor.  For simplicity I've used MC34063, thanks it can work from 3V min. Circuit is: I'm...
Thursday, 23 July 2015 - 05:45
[solved] Respond as SPI slave
Hello, world! What I'm trying to do is to send one of atmega's port state to another atmega and receive other's atmega port state. Basically pressing a button on one side will lit...
Thursday, 25 June 2015 - 03:43
How to make 24 bit long from 3 bytes
I'm reading mesuring result from external 24-bit ADC and it returns 3 bytes. It seems easy to make a 16 bit int from 2 bytes: weight = ((long)ram_tmp_m<<8) + ram_tmp_l;but...
Wednesday, 13 May 2015 - 06:52
MacBook Air 2010 RAM hack
Hello, guys. As you know, RAM in MBA is not upgradeable, because it is soldered to mainboard. My idea is to resolder memory chips. There are 16 chips on main board and general so-...
Sunday, 2 March 2014 - 04:48
DS18S20 reads very low temperature
Hello, everybody, I have atmega16 and some DS18s20 temp sensors. What I'm trying to do is to display temp on 2x40 lcd. Everything seems fine, except that temp I read is -32C (...
Saturday, 8 February 2014 - 11:45