Post Created date
Mega + GRBL + CNC shield: Y axis works, X doesn't
Use an oscilloscope to make sure there is actually a signal coming out of the Mega board to the X step driver.  Or a logic probe would work.   --Mike  
Friday, 26 July 2019 - 02:43
500 ohms
Nerd Sniping   Color Codes Ohm's Uncle   --Mike  
Friday, 26 July 2019 - 00:05
500 ohms
Sorry I can't help, I only have 121 ohm 1% resistors.   --Mike   EDIT: see Preferred Numbers  
Thursday, 25 July 2019 - 16:33
Piezo disc communication
Quote: 5V single supply operation   Is this a requirement, or just convenient?   Looking at the photo, there is a wire running to the receiver, so you could feed +/-...
Saturday, 20 July 2019 - 21:36
Piezo disc communication
Oops, missed this bit. Can you suggest an alternate part? --Mike  
Saturday, 20 July 2019 - 20:23
Piezo disc communication
BTW, you don't need an actual inductor for the filter.   An op-amp + capacitor can by used to simulate an inductor well-enough for a filter.  See the Wikipedia page for...
Saturday, 20 July 2019 - 20:10
Piezo disc communication
This is one place you will get better results using a bit of analog circuitry.  Your signal is a fixed frequency and uses an on-off keying (OOK) mechanism to transmit the...
Saturday, 20 July 2019 - 19:22
help with Bubble Sort
Even though I use long names like battery_sample_num for variables, I'll still use 'i' as a loop variable.  I find it's easier to read this: for (int i=1; i<10; ++i...
Thursday, 18 July 2019 - 21:52
NHD-C12832A1Z Andy Gock glcd library atmega328p no output
After applying power to the display, wait a while before trying to initialize it.   --Mike  
Thursday, 18 July 2019 - 02:07
Step one is to be able to program the 328PB controller without attaching anything to it, other than perhaps an LED (with a current-limiting resistor).  Once you can load code...
Wednesday, 17 July 2019 - 03:02
spi ss line / pin issue
I'd use an extra pin if you have one available.   --Mike  
Tuesday, 16 July 2019 - 22:26
Under what circumstances would you *NOT* want to use the BOD?
Do you happen to have a part number for a FET which would be good to use with a 9V battery?   --Mike  
Tuesday, 16 July 2019 - 09:16