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328P sleep current wildly different between two copies
Brian Fairchild wrote: What are your fuses set to? +1  
Wednesday, 22 July 2020 - 06:39
Safely measure 12v boat battery voltage with AVR
Thanks. I agree about the zener, butwould have thought the internal clamp diodes would suffice with a 47k resistor. I don't need extreme accuracy, but apparently the digital video...
Wednesday, 15 July 2020 - 14:03
Safely measure 12v boat battery voltage with AVR
Thanks. The person I'm doing this job for (the voltage monitor is a mnor extra), has plenty of experience of boat stuff. He built a whole bunch of stuff for Ellen MacArthur, when...
Wednesday, 15 July 2020 - 13:32
Curve fit for sensor equation
Some years back, I found Zunzun.com very useful for deriving equations that described certain relationships. Right now, the site seems to be inaccessible, however.  
Friday, 10 July 2020 - 17:34
USART in SPI mode for reading 128 bit stream at 25,000 bps
For anyone who reads this thread with an eye to doing something similar, one thing to remember is that if you re-write the baud rate divider register, it resets the divider. This...
Thursday, 2 July 2020 - 11:27
Simulating a CRT corner frequency with an LED
Are you trying to emulate a light pen, or a "gun" from an old arcade shooting game?
Thursday, 4 June 2020 - 22:23
Saturday Morning Junkbox Project - Voltage Reference.
digitalDan wrote: Nice, neat package.  What's on the inside? I'm guessing it's the Adafruit LM4040 breakout, a battery and some air.  
Saturday, 30 May 2020 - 18:34
HAkko FX888D......Weller WTCPT it is NOT!!
gchapman wrote: ESD safe, powerful 65W soldering iron with LCD display, digital PID temperature adjustment 250-480C in stock | olimex (on Wordpress) [third paragraph] For...
Saturday, 23 May 2020 - 13:28
Dumb MPPT question
joeymorin wrote: John_A_Brown wrote:They have an OC voltage of around 20V And the short-circuit current at full insolation? 250mA Just checked it.
Tuesday, 19 May 2020 - 15:23
USART in SPI mode for reading 128 bit stream at 25,000 bps
I have a surfeit of I/O pins. I can live without the TX1 pin.
Monday, 18 May 2020 - 16:25
USART in SPI mode for reading 128 bit stream at 25,000 bps
From the datasheet...   "Using the USART in MSPI mode requires the Transmitter to be enabled, that is, the TXENn bit in the UCSRnB reg-ister is set to one. When the...
Monday, 18 May 2020 - 12:51
USART in SPI mode for reading 128 bit stream at 25,000 bps
"If you don't enable the TX then nothing would come out on the pin. (same as for the XCK) "   Is that true? My understanding was that I have to keep the TX fed with bytes, as...
Monday, 18 May 2020 - 12:16

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