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Flame Detector
Semiconductor UV sensors "might work", but just barely. The industrial tube sensors, such as the 'mini peeper' series from Honeywell, operate at wavelengths shorter than 300...
Thursday, 10 December 2015 - 22:04
I2C difficulties reading BMP180 temperature
Will this cause damage? According to the data sheet, absolute maximum voltage is 4.5 volts... so yes it is highly possible that did some damage.     
Sunday, 6 December 2015 - 18:04
General Wireless Security
However, a potato field in Idaho or a corn field in Nebraska would not seem to be highly attractive targets It may sound preposterous, but there is a certain class of criminal...
Saturday, 5 December 2015 - 17:51
ATmega644P + RTC: I2C problems
/**************************************************************************** Call this function to send a prepared message. The first byte must contain the slave address and...
Friday, 4 December 2015 - 20:42
ATmega644P + RTC: I2C problems
messageBuf[0] = (DS3231 << TWI_ADR_BITS) | (TRUE << TWI_READ_BIT); // first byte: slave adr, read TWI_Start_Transceiver_With_Data(messageBuf, 2); This code only...
Thursday, 3 December 2015 - 21:53
ATmega644P + RTC: I2C problems
Cooooool. Mark this one solved.  
Wednesday, 2 December 2015 - 21:34
ATmega644P + RTC: I2C problems
  "Is this not the case?" Nope. In an I2C read transaction, nothing will be sent to the slave beyond its I2C address (plus the read flag). To specify the register to begin...
Wednesday, 2 December 2015 - 21:16
ATmega644P + RTC: I2C problems
You never tell the RTC which register to begin reading from.   
Wednesday, 2 December 2015 - 19:44
HELP!! ATtiny88 Everything was ok but now i can only program it, program does not execute.
" it was working for last 3 weeks"   "the new pcb behaves exactly same way."   Strong indicators that something in your code is wacky.    But.   Have...
Monday, 23 November 2015 - 23:43
Voltage Controlled Volume / Amplifier
DAC08: showing ones age there!   It is still available though, and has been a workhorse DAC for... ever.  
Monday, 23 November 2015 - 23:16
HELP!! ATtiny88 Everything was ok but now i can only program it, program does not execute.
"3.45-350V on the pins."   There's the problem.   Seriously, if the boards worked at first, but you have been modifying the code, there is probably an issue with the...
Monday, 23 November 2015 - 23:13
Voltage Controlled Volume / Amplifier
Essentially, your want to multiply an 8 bit waveform by an 8 bit volume, producing a 16 bit output.   I suspect that you can save component count, PCB real estate, and coding...
Monday, 23 November 2015 - 23:09