Post Created date
Boggles the mind!
Take a household water heater, empty the water, cut off the top, and fill it with oil.  Use the input tap as the negative terminal and the output tap as the positive terminal...
Wednesday, 2 October 2019 - 23:49
7805 dead during not connect
Thank you for your constructive criticism.  I am not trying to be a "condescending jerk": rather I am trying to shake modern electronic technicians out of their cycle of...
Tuesday, 1 October 2019 - 23:54
Need help with Newhaven serial lcd
The Newhaven LCD seems like an expensive luxury given that eBay has 16x4 LCD displays with blue backlights that look exactly the same for about $5.   The eBay displays...
Tuesday, 1 October 2019 - 23:26
spo2 Pulse Oximeter (Mega48) Serial to PC connection
Usually the only way that I can tell the RX from the TX is to actually look at the wires with an oscilloscope.  The TX from the PC will show serial pulses (default normal...
Tuesday, 1 October 2019 - 23:04
7805 dead during not connect
It would be nice if people could post schematics, but it is often impossible and usually meaningless.  The electronics industry does not seem to have a schematic file format...
Monday, 30 September 2019 - 18:41
Guess the missing PCB components?
The 2.2K resistor would go across the LED points as shown below.  The missing #2 component is most likely a resistor.  Start with a 1K and if theat doesn't work, try a...
Friday, 27 September 2019 - 22:05
IR Data Transfer with USART
If you are going to have the transmitter and receiver be about 1 meter apart, I suggest using a physical wire connection. Even wire-wrap AWG30 is good for 1 meter. Since nothing...
Thursday, 26 September 2019 - 20:54
Is a better SoftwareSerial available for ATtiny45/85?
I've been doing MIDI since the 1980s with DIY microprocessors.   In my opinion, none of the serial based UARTs can handle full speed high-density MIDI streams.  In...
Wednesday, 25 September 2019 - 00:23
Fully DIY Radio Transceiver System - Thoughts?
Can your project be a multi-level documentation of an existing technology?  In that case I suggest getting several of these WeMOS module boards (eBay here: https://www.ebay....
Thursday, 19 September 2019 - 22:06
Polling an external interrupt does it affect the timer0
Polling the external interrupt flag in your main code will not affect the counter of timer0.  The prescaler of timer0 counts up one with each system clock pulse.  If the...
Tuesday, 17 September 2019 - 03:28
ATMega-UART (Full Duplex) to device (Half Duplex)
The Mega2560 has several hardware UARTs.  These are accurate and reliable.   The Arduino library includes a software Serial port that is controlled by PCINT...
Monday, 16 September 2019 - 19:33
Duplicating eeproms
The ICs in the JPG file are not EEPROMs.  They are one-time-only programmable ROM ICs.  You write to them once.  If your program works, wonderful.  If your...
Sunday, 15 September 2019 - 16:10

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